Relative Standard Deviation Calculator

Your details

Enter individual data points, or provide a pre-calculated mean and standard deviation.
Separate values with commas, spaces, or line breaks.
Use sample SD (divides by n-1) when your data is a sample from a larger population. Use population SD (divides by n) only when you have every value in the full population.
Relative Standard Deviation (RSD)Good precision
1.535%

Standard deviation as a percentage of the mean

Mean10.3
Standard Deviation0.1581
Variance0.025
Number of values (n)5
Standard Error of Mean (SEM)0.0707
1.535% %
Excellent<1%Good1%-5%Moderate5%-10%High10%-20%Very high20%+

RSD is 1.54% - acceptable precision.

  • An RSD of 1.54% is good precision. Most analytical chemistry methods and quality control processes accept RSD values below 5%.
  • Approximately 68% of your values are expected to fall between 10.1419 and 10.4581 (mean plus or minus one SD).
  • With 5 data points, the standard error of the mean is 0.0707, giving an estimate of how close the sample mean is to the true population mean.
  • Your data ranges from 10.1 to 10.5, a spread of 0.4000.

Next stepIf the RSD is higher than expected, look for outliers or repeat the measurement series to see whether the variation is systematic or random.

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