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Relative Standard Deviation Calculator

Enter your data values to find the relative standard deviation.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

The relative standard deviation (RSD), also called the coefficient of variation (CV), expresses a data set's standard deviation as a percentage of its mean: RSD = (standard deviation ÷ mean) × 100%. Unlike the raw standard deviation, this normalized figure lets you compare the spread of two data sets measured on completely different scales.

Analytical chemists, quality-control labs, and pharmaceutical scientists rely on RSD to judge measurement precision and instrument repeatability — lab accreditation standards such as ISO/IEC 17025 and pharmacopoeial assay-validation guidelines like USP General Chapter 1010 often set maximum acceptable RSD thresholds that a method or instrument must meet before results are considered reliable.

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