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This feature is in beta. Use at own risk For supported Centrifuges: 1. Select the brand and model of your centrifuge to automatically populate the dimensions and maximum RPM. 2. Input the desired RPM to calculate RCF and k-Factor. OR: Enter the desired RCF to calculate RPM and k-Factor. Note that not all centrifuges listed have a know minimum radius, therefore k-Factor cannot be calculated for them. For unsupported Centrifuges: 1. Select Custom for brand and model (default). 2. Enter maximum radius and minimum radius, followed by Max RPM. 3. Then enter the desired RPM to calculate RCF and k-Factor. OR: Enter the desired RCF to calculate RPM and k-Factor. Please note: You can also select whether Maximum, Minimum or Average radius are used. Maximum radius is used by default. If you have a centrifuge that you would like added to the list please go to Contact->Request feature and send in a request.