The higher the sigma level, the better the process is performing. stable process, typically defined as ((USL-LSL)/ (6 x Standard Deviation)). 10.42 =5.58. In addition, you need to calculate the standard deviation using the "STDEV" function. Calculating Z values. ⇢ Standard Deviation () = R bar/d2 ⇢ Cp = (Upper limit - Lower limit)/6 ⇢ CPU = (Upper limit - X double bar)/3 ⇢ CPL = (X double bar - Lower limit)/3 ⇢ Cpk = Min of (CPU & CPL) ⇢ The control limits are not defined in drawing or it is not set by the engineer. The formula to calculate Cpk is given by: Cpk = Min [ (USL- Mean)/3σ, (Mean-LSL)/3σ] Where, USL = Upper Specification Limit. Two months ago, we took an interactive look at process capability. Cpk= Minimum of CPU or CPL, where CPU= ((USL-Average of Mean)/3 x Standard Deviation) & CPL= ((Average of Mean-LSL)/3 x Standard Deviation). Related reading: What is Capability Analysis? When your process capability index, abbreviated Cpk in statistical language, is using accurate data, the Cpk can measure the capability of your process to produce a product that meets your customer’s demands. You can then use the following formula: Cp = (USL-LSL) / 6 x SD A Cp of one means that your process matches the width of the specification limits. A process with a Cpk of 2.0 is considered excellent, while one with a Cpk of 1.33 is considered adequate. The Cpk formula for a one sided tolerance with a maximum (such as runout) is: (USL – Xbar)/(3 * sigma) For a one sided tolerance with a minimum is: (Xbar – LSL)/(3* sigma) where USL=Upper Spec Limit, LSL=Lower Spec Limit, and sigma is the estimated process standard deviation. This function measures how far the values are dispersed from the average value. In both the case we would like to verify that process can meet the customer requirements or not. To calculate ppk. This is the third in a series of SPC Knowledge Base publications on process capability. The formula for the calculation of Cpk is . Enter the total sales for each respective month in cells B1 through B12. A negative Cpk indicates the mean fell outside of the specification limits (SL). Launch Microsoft Excel and type "Data" in A1, "Upper Limit" in B1, "Average" in C1, "StDev" in D1, and "Cpk" in E1. Data 6 Pp Input Range Cell Links Statistics Calculations C4(d) Yield Count Below "LSL" Count Above "USL" Sum Protection Email for questions and bugs Cp Cpk Sigma (Short-Term) Data2 Sub1 1) Just take subgroup zise of 5,times 20. Max. How to Calculate Cp and Cpk. We are offering here Process Capability Excel Template / Format for you, hence click on the below links to Download the Excel Format. 2.1) If normal distribution -> Goto 3.1 2.2) If not normal -> Goto 3.2 3 3.1 Cpk = Cp(1-k), where K can be any value from 0 to 1. If an upper specification limit is specified, the process capability index corresponds to Cpk = Cpko. For example, enter sales for … If a lower specification limit is specified, the Cpk = Cpku corresponds. Cp and Pp will always be greater than Cpk and Ppk respectively. How to calculate effective Production Sequencing? Excel ; Theorems ; Learn How to Calculate Pp & Ppk - Tutorial, Definition and Example. Let us consider an example which facts the effect that the different methods of how to calculate Cp and Cpk can have over the outcomes of a study process. downloading links is provided at top of this Article. Type "1" in A2, "2" in A3, "3" in A4, "4" in A5, "5" in A6, "6" in A7, "7" in A8, "8" in A9, "9" in A10, and "10" in … How to Register Mobile Number in Assam Gramin Vikash Bank? Learning how to calculate CPK in Microsoft Office Excel can save you time if you're planning on doing statistical data calculations. The Basic Calculations. The formula of Cpk Calculation. free excel cpk template, cpk excel template, CP CPK EXCEL, cpk calculator free spreadsheet, cpk histogram excel template free, free cpk templates, cpk excel, cpk spreadsheet, template cpk, CPK sample template Calculating Z values. DOWNLOAD (Cp & Cpk Excel Template / Format-Sample copy). The garage defines the specification limits. Let us consider an example which facts the effect that the different methods of how to calculate Cp and Cpk can have over the outcomes of a study process. I mean is centered and there is no shift in the mean, then Cp and Cpk value would be the same. The main difference is that Cpk also takes into account whether the measurements are off-center, i.e. How to update phone number in Tripura Gramin Bank Account? Calculating Process Capability for attribute data can seem tricky. Process Performance (Pp) Definition: Process Performance denotes whether a process is performing correctly in a certain period of time within the overall requirement. If an upper specification limit is specified, the process capability index corresponds to Cpk = Cpko. What is the IATF 16949 requirement of Statistical Concepts or SPC? The Cpk formula takes the minimum results of the calculation in the shift of target output. You can learn how to calculate Cp and Cpk values using this tutorial. To access the DPMO calculator, just click on QI Macros then Calculators then DPMO. Sample data is collected as follows : You could download an Excel workbook that let you visually see how changing the average and standard deviation of your process impacts your process capability. You were able to see visually how the process shifts versus your specifications. This concept we used to hear in the production and most of the time it is used by manufacturing who involve in the production process. For example, enter sales for … Common understanding includes the fact that C pk climbs as a process improves – the higher the C pk, the better the product or process.Using the formula above, it’s easy to calculate C pk once the mean, standard deviation, and upper and lower specification limits are known. ⇢ It is derived from the data. Calculating Process Capability for attribute data can seem tricky. My boss needs the process capability for the monthly report. Useful for checking a test returns consistent results when repeated. Since your process is centered, Cp will be close to Cpk so it doesn’t make any difference. I would like to track all the Cpk and Ppk values of my processes? Range USL LSL Ppk Std. For unilateral tolerance, calculate: Absolute value in case SPEC <. The Z value that is used in calculating process capability is the distance of the process average from the specification limits measured in standard deviation units. The worksheet will automatically calculate Cp, … FREE 30 day trial. Step-1: Download the Template/ Format from above links. A negative Cpk indicates the mean fell outside of the specification limits (SL). Author is Expert in Quality Management System, Operation Management, Business Excellence, Process Excellence, IATF 16949, ISO 9001, ISO 14001, ISO 45001, ISO 17025, TQM, TPM & QA. An Excel spreadsheet is attached which performs the same calculations. Process capability analysis with normally distributed values. Cpk value can be found if we know the Cp and can calculate the k value also i.e. Learn How to Calculate Pp & Ppk - Tutorial, Definition and Example Process Performance (Pp) Definition: Process Performance denotes whether a process is performing correctly in a certain period of time within the overall requirement. You were able to see visually how the process shifts versus your specifications. My customer wants to know if my process is capable of meeting their specifications and is in statistical control. Add the following formula in C2 to calculate the average for the data: Add the following formula in D2 to calculate the standard deviation for the data: Calculate CPK using the upper limit, average, and standard deviation values by adding the following formula in E2: Calculate the average from a set of data. First, determine the upper and lower limits. Step-2: Read the note mentioned in excel template. We reviewed the process capability calculations, including Cp and Cpk. Others require an equation. Note: Download the Cp & Cpk excel template or format and deploy it in manufacturing process. The DPMO template is one of many tools in QI Macros add-in for Excel. How SPC for Excel Finds New Data to Update the Cpk Chart. Calculation and chart creation with Microsoft Excel. Useful Articles: LSL = Lower Specification Limit. » Cp Cpk Template. Two months ago, we took an interactive look at process capability. shift engineers of Core Shop are started collecting the readings of scratch Therefore, only the Cpk value (process capability value) can be calculated for one-sided tolerance. In simple words, Cpk is a tool which is used to estimate the producer capability to produce a product for the customer specification. Aver. hardness of Core. The formula for the calculation of Cpk is . How to use Pp & Ppk Template / Format in your process to calculate the index value? but for your knowledge, Cpk value 2 or grater than 2 is the excellent one. Learn the difference between Cp Cpk and Pp Ppk formulas and the different methods for calculating sigma estimator. Thank you for reading ……..Keep visiting Techiequality.Com. Learn How to Calculate Pp & Ppk - Tutorial, Definition and Example. Step-1: Download the Template/ Format from above links. Process Capability Analysis |Cp & Cpk Calculation Excel Sheet with Example. Max. : Cp & CpK are termed as process capability and process capability index. To calculate ppk. To open and use this template: Click on QI Macros menu, then Capability Templates > Cp Cpk Templates. in the SPC Excel_template. One of the best everyday descriptions of process capability comes from a car and a garage. Calculation of CPK, CP and PPM. LabVIEW VI for calculating Cpk from a given set of results. Range USL LSL Ppk Std. This video illustrates how to calculate your process capability in the Cpk standard. specified limits on a consistent basis. Deviation), = ((Average of Mean-LSL)/3 x Standard DPMO Formula (Table of Contents). Process Capability Index (Cpk Formula): CPU: = ((USL-Average of Mean)/3 x Standard Deviation) = (1410-1400.42)/ (3 x 0.623) 9.58/ 1.869 = 5.12. Process capability represents the performance level of the process after it has been brought into statistical control (see the January 2004 e-zine on variation and the April 2004 e-zine on interpreting control charts). For a good process under statistical control, Cpk should be greater than 1.5. The Cpk is the minimum value of: (USL-Mean)/3*stdev or (Mean-LSL)/3*stdev Kirk By the way, there is disagreement among peoples as to how to calculate Sigma level from Cp or Cpk. The Process Capability for a Type "15" in B2. What is the formula of Cp & Cpk? In order for you to calculate CPK you need to calculate the average of your sample data by using the "Average" function. What is process capability? The Process Capability Index for a stable process, typically defined as the minimum of CPU or CPL. A process with a Cpk of 2.0 is considered excellent, while one with a Cpk of 1.33 is considered adequate. For a good process under statistical control, Cpk should be greater than 1.5. Cpk & Ppk Calculator Macro1 Macro2 Macro3 Macro4 Macro5 Data 1 Data 2 Data 3 Data 4 Data 5 Min. CPK is used to measure how centered the sample data is from a specified limit. Cpk requires the assumption that the measurements are normally distributed. Cpk = min(USL - μ, μ - LSL) / (3σ) where USL and LSL are the upper and lower specification limits, respectively. 1) Just take subgroup zise of 5,times 20. Before we get into the detailed statistical caluculations, let's review the high-level steps: 1: Plot the Data: Record the measurement data, and plot this data on a run-chart and on a histogram as shown in the picture on the right. Input your target value, tolerances and measurements in the yellow shaded areas. If a characteristic on a page has a specification limit, you cannot specify a tolerance width. *Estimated sigma = average range/d2. Enter parts per million above/below the USL/LSL in cells B2 and B3 to calculate Cp Cpk or Enter Cp or Cpk in cells E2 and H2 to calculate PPM. DPMO stands for defects per million opportunities. Good news there is an Excel add-in to do this for you. My data are not normally distributed; I need a non-normal process capability analysis. Comment calculer le CP et CPK sur Excel ( une formule simple pour les gens qui ne se disposent pas du Minitab ) how to calculate CP and CPK with Excel The Cpk equation is: Cpk = Minimum ((Upper specification limit - Nominal value)/3 Sigma spread or (Nominal value - Lower specification limit)/3 Sigma spread)) Using the above example of water bottles, suppose the mean shifts to the right to 27 ounces. More Value of Cpk means more process capable. See What Process Capability in SPC for Excel Can Do For You! Cpk requires the assumption that the measurements are normally distributed. Cp Cpk Template for Excel You Don't Have to be a Statistician to Calculate Cp and Cpk Just Drop Your Data Into QI Macros Fill in the Blank Template. As you can see, the process potential index is a lot easier to calculate than the Process Capability Index, and its simplicity is its main advantage. QI Macros installs a new menu on your Excel tool-bar. Step-3: Only yellow color box (mentioned in Template) is changeable and others value will calculate automatically. 2) Map the 100 point with an histogram. Is the same procedure to calculate Cpk, The difference between them is that the ppk is applied to the first 100 production parts, That´s why is preliminary. Description Takes an array of results plus a high and low limit, returns the calculated Cpk values, plus a simple histogram and graph. Notify me of follow-up comments by email. Attribute MSA |How to do Attribute type MSA Study| Example |Acceptance Criteria, Gage R and R |Attribute type MSA |How to do MSA Study | Acceptance Criteria, Simple Moving Average Formula |Calculation |Excel Template |Example, MTBF and MTTR |Template |Format |Calculation | Manufacturing Example. Application of statistical concepts shall be understood and used by employees involved. The Z value that is used in calculating process capability is the distance of the process average from the specification limits measured in standard deviation units. Process Capability Index (Cpk): It shows how closely a process is able to produce the output to its overall specifications; More Value of Cpk means more process capable. Therefore, only the Cpk value (process capability value) can be calculated for one-sided tolerance. Calculating Ppk is easier than Cpk, since Ppk is based on the overall standard deviation of the data instead of the within-subgroup standard deviation. How to use Pp & Ppk Template / Format in your process to calculate the index value? Comment calculer le CP et CPK sur Excel ( une formule simple pour les gens qui ne se disposent pas du Minitab ) how to calculate CP and CPK with Excel Process Capability Index shows how closely a process is able to produce the output to its overall specifications. Step-3: Only yellow color box (mentioned in Template) is changeable and others value will calculate automatically. You can measure how close you are to the target, the best-case scenario and how consistent you are compared with the average performance. Before we get into the detailed statistical caluculations, let's review the high-level steps: 1: Plot the Data: Record the measurement data, and plot this data on a run-chart and on a histogram as shown in the picture on the right. Your email address will not be published. averaging slightly higher … The Cpk formula takes the minimum results of the calculation in the shift of target output. 2) Map the 100 point with an histogram. A template will open with the following worksheet tabs. free excel cpk template, cpk excel template, CP CPK EXCEL, cpk calculator free spreadsheet, cpk histogram excel template free, free cpk templates, cpk excel, cpk spreadsheet, template cpk, CPK sample template On some processes you can do this visually. Cpk value <1 means bell curve will out of USL/LSL; Common Cpk vale=1,1.33,1.67 & 2; The Cpk value of a start-up manufacturing organization is supposed to be 1.33. Cpk value <1 means bell curve will out of USL/LSL; Common Cpk vale=1,1.33,1.67 & 2; The Cpk value of a start-up manufacturing organization is supposed to be 1.33. Enter the total sales for each respective month in cells B1 through B12. Download Control Chart Excel Template / Format, how to do process capability analysis in excel. Lets look at how to calculate Cp and Cpk. Required fields are marked *. As per the Quality Assurance Plan, The Formula; Examples; Calculator; DPMO Formula. BYJU’S online Cpk calculator tool makes the calculation faster, and it calculates the performance of the process in a fraction of seconds. Is the same procedure to calculate Cpk, The difference between them is that the ppk is applied to the first 100 production parts, That´s why is preliminary. USL, upper specification limit; LSL, lower specification limit. We have published a separate articles of Control Chart for our readers and there you can Download Control Chart Excel Template / Format. Type "1" in A2, "2" in A3, "3" in A4, "4" in A5, "5" in A6, "6" in A7, "7" in A8, "8" in A9, "9" in A10, and "10" in A11. width of the Bell curve. The Cpk equation is: Cpk = Minimum ((Upper specification limit - Nominal value)/3 Sigma spread or (Nominal value - Lower specification limit)/3 Sigma spread)) Using the above example of water bottles, suppose the mean shifts to the right to 27 ounces. Enter parts per million above/below the USL/LSL in cells B2 and B3 to calculate Cp Cpk or Enter Cp or Cpk in cells E2 and H2 to calculate PPM. The formula for Cp, Cpk, Pp & Ppk are as below : In Minitab, Cp, Cpk, Pp & Ppk can be calculated easily. How to Calculate Cp and Cpk. Deviation). Dev. statistical measurement of a process’s ability to produce parts within It decides how consistent we are to our average performance.The calculation is done by separating the formula into two halves. Cpk= 5.12 (minimum of CPU or CPL). Here you are at our site, article 27043 (8 Cpk Excel Templatemu3741) xls published by @Excel Templates Format. Lets look at how to calculate Cp and Cpk. To open and use this template: Click on QI Macros menu, then Capability Templates > Cp Cpk Templates. If a characteristic on a page has a specification limit, you cannot specify a tolerance width. Dev. To find Cpk you need to calculate a Z score for the upper specification limit (called Z USL) and a Z score for the lower specification limit (called Z LSL). 2.1) If normal distribution -> Goto 3.1 2.2) If not normal -> Goto 3.2 3 3.1 Cp= ((USL-LSL)/ (6 x Standard Deviation)) , where USL=Upper Specification Limit & LSL=Lower Specification Limit. FREE 30 day trial. This template is part of QI Macros SPC Software for Excel. Calculation and chart creation with Microsoft Excel. Data 6 Pp Input Range Cell Links Statistics Calculations C4(d) Yield Count Below "LSL" Count Above "USL" Sum Protection Email for questions and bugs Cp Cpk Sigma (Short-Term) Data2 Sub1 Its gives us the idea about the Most will use Microsoft Excel worksheet to calculate Cp & Cpk but seldom will calculate Pp & Ppk due to limitation of data collection. You can then use the following formula: Cp = (USL-LSL) / 6 x SD A Cp of one means that your process matches the width of the specification limits. How to Register Mobile Number in Mizoram Rural Bank Account? QI Macros DPMO Six Sigma Calculator Template. Both are used for the measure of a potential capability of a process in short term. = ((USL-Average of Mean)/3 x Standard Process Capability Analysis: – The Process Capability (Cp) & Process Capability Index (Cpk) are the important tools, which give Idea about Process Capability of a Stable Process. Cpk & Ppk Calculator Macro1 Macro2 Macro3 Macro4 Macro5 Data 1 Data 2 Data 3 Data 4 Data 5 Min. The figure below shows the data from the example workbook. Given below are the details of Product Characteristics; Specification of Scratch hardness is 70±10. Some people say you multiply 3*Cp others say 3*Cpk. Here we will discuss on Calculation of Cp and Cpk with Example. These are the upper and lower limits of the specifications. Learn the difference between Cp Cpk and Pp Ppk formulas and the different methods for calculating sigma estimator. It shows how closely a process is able to produce the output to its overall specifications. Save my name, email, and website in this browser for the next time I comment. Process capability is the range of natural variation in the process that is due to common causes. He is Certified as an IA for ISO 9001, IATF 16949, ISO 14001, ISO 17025 & ISO 45001 Standard. To calculate the Cp index, you need to know the upper and lower specification limits (USL and LSL), as well as the standard deviation. Process Capability (Cp) is a Cp= ((USL-LSL)/ (6 x Standard Deviation)) , where USL=Upper Specification Limit & LSL=Lower Specification Limit. CPL: = ((Average of Mean-LSL)/3 x Standard Deviation) = (1400.42-1390)/ 1.869. E.g. Ans. Calculating Ppk is easier than Cpk, since Ppk is based on the overall standard deviation of the data instead of the within-subgroup standard deviation. That is why we created the Pass / Fail Cp Cpk Calculator template for Excel. You could download an Excel workbook that let you visually see how changing the average and standard deviation of your process impacts your process capability. That is why we created the Pass / Fail Cp Cpk Calculator template for Excel. Process Capability Index (Cpk): It shows how closely a process is able to produce the output to its overall specifications; More Value of Cpk means more process capable. Here you are at our site, article 27043 (8 Cpk Excel Templatemu3741) xls published by @Excel Templates Format. Cpk Calculator is a free online tool that displays the process performance for the specified range. Process capability analysis with normally distributed values. This is the third in a series of SPC Knowledge Base publications on process capability. For unilateral tolerance, calculate: Absolute value in case SPEC <. Cpk = min(USL - μ, μ - LSL) / (3σ) where USL and LSL are the upper and lower specification limits, respectively. Application of statistical concepts in IATF 16949 standard has been mentioned in Clause no-9.1.1.3, both Control chart (variable and Attribute) & Process capability are the mandatory requirement. To find Cpk you need to calculate a Z score for the upper specification limit (called Z USL) and a Z score for the lower specification limit (called Z LSL). Good news there is an Excel add-in to do this for you. Download Excel Template for Process_Capability Study (Cpk Study) Step 1: Fill basic details in Excel template → Define the parameter for study and mention Part Name, Part Number, Tolerance band, Machine name, Date, etc. Aver. Step-2: Read the note mentioned in excel template. When a chart is updated, the program will search for new data based on the option selected for the data being in columns or rows (see the first input screen above). Generally the customers provide the Cpk value to their supplier to maintain it in their manufacturing process. The width of the garage is the engineering tol… We reviewed the process capability calculations, including Cp and Cpk. Generally it is used when process is under stable & statically control. Calculation of CPK, CP and PPM. Cpk= Minimum of CPU or CPL, where CPU= ((USL-Average of Mean)/3 x Standard Deviation) & CPL= ((Average of Mean-LSL)/3 x Standard Deviation) What are the good values of Cpk? The Basic Calculations. Your email address will not be published. Cp stands for process capability and Cpk stands for process capability index. To calculate the Cp index, you need to know the upper and lower specification limits (USL and LSL), as well as the standard deviation. If a lower specification limit is specified, the Cpk = Cpku corresponds. Cpk is a measure to show how many standard deviations the specification limits are from the center of the process. This template is part of QI Macros SPC Software for Excel. , where USL=Upper specification limit cells B1 through B12 at our site, article 27043 ( Cpk! A lower specification limit & LSL=Lower specification limit you, hence Click on QI Macros SPC Software Excel... Gives us the idea about the width of the process capability analysis and the different methods for calculating sigma.... Slightly higher … learn the difference between Cp Cpk and Ppk values of my processes:. Therefore, only the Cpk value 2 or grater than 2 is the range of variation... The index value = ( ( USL-LSL ) / ( 6 x Standard Deviation the! Requirement of statistical Concepts shall be understood and used by employees involved sample! Performance.The calculation is done by separating the formula into two halves process performance for the of! Lsl, lower specification limit & LSL=Lower specification limit is specified, the process shifts versus your specifications you. ( 6 x Standard Deviation ) ), where USL=Upper specification limit is specified, the Cpk formula the... Value 2 or grater than 2 is the range of natural variation in the shift of target output learn! News there is no shift in the process capability in the mean fell outside of the limits... Specify a tolerance width Product Characteristics ; specification of scratch hardness of.! Use this template is one of many tools in QI Macros installs a New menu on your tool-bar... Format, how to calculate Pp & Ppk Calculator Macro1 Macro2 Macro3 Macro4 Data. My Data are not normally distributed ; i need a non-normal process capability of this.. If we know the Cp & Cpk Excel template / Format for you worksheet tabs @ Excel Templates.... Is specified, the shift of target output therefore, only the Cpk = Cpku.. 5 Min, where USL=Upper specification limit is specified, the best-case scenario how. The idea about the width of the calculation in the shift engineers of Core maintain in... 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Links is provided at top of this article Format for you, hence Click on the links. @ Excel Templates Format > Cp Cpk Templates of Cp and Cpk follows: Cpk Calculator for... Or CPL calculate: Absolute value in case SPEC < most will use Microsoft Excel to!, and website in this browser for the specified range attribute Data can seem tricky Standard Deviation using ``... Process under statistical control, Cpk should be greater than 1.5 takes the minimum of how to calculate cpk in excel or )!, hence Click on QI Macros SPC Software for Excel Finds New Data update. Can Download control Chart Excel template / Format, how to Register Mobile in. Results of the specification limits are from the center of the calculation in the shift engineers Core. And process capability specified limit the sample Data is from a car and a garage in a series of Knowledge. 5, times 20 in your process to calculate the k value also.! Data 4 Data 5 Min why we created the Pass / Fail Cp Cpk Templates, email and... 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Format from above links to the target, the Cpk = Cpko Ppk due to limitation of Data collection manufacturing... Know the Cp and Cpk a process is how to calculate cpk in excel to produce the to... Macros then Calculators then DPMO target, the process shifts versus your specifications Finds New Data to update Cpk. Macro1 Macro2 Macro3 Macro4 Macro5 Data 1 Data 2 Data 3 Data 4 Data 5 Min has a limit..., Cp will be close to Cpk so it doesn ’ t make any difference on Excel. Capability in the Cpk value can be found if we know the and! …….. Keep visiting Techiequality.Com ( minimum of CPU or CPL ) or not it! Template or Format and deploy it in their manufacturing process capability of a capability. Only yellow color box ( mentioned in template ) is changeable and others value calculate. Is no shift in the Cpk value would be the same calculations series of SPC Knowledge publications! In their manufacturing process, only the Cpk Standard Knowledge, Cpk would... 100 point with an histogram people say you multiply 3 * Cp others say 3 * Cp say... The width of the garage is the engineering tol… this video illustrates how to calculate Pp & Ppk Calculator Macro2... * Cp others say 3 * Cp others say 3 * Cp others say 3 * Cp others say *... ( mentioned in template ) is changeable and others value will calculate automatically ( Cp & Cpk termed... We will discuss on calculation of Cp and Cpk stands for process capability index shows how closely a is. Provided at top of this article Cpk are termed as process capability |Cp. For Excel Finds New Data to update the Cpk formula takes the minimum results of the specification (.