Relative Standard Deviation Calculator

Q: RSD vs standard deviation?

SD is in the same units as the data. RSD is dimensionless (a percentage), making it easier to compare across different measurements.

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Relative Std Dev (%RSD)

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Mean

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Standard Deviation

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Coefficient of Variation

Recent Calculations

What Is Relative Standard Deviation?

Relative Standard Deviation (RSD), also called Coefficient of Variation (CV), expresses standard deviation as a percentage of the mean. It allows comparing variability between datasets with different units or scales.

Formula

%RSD = (σ / |μ|) × 100

Example

For {10, 12, 11, 13, 9}: Mean = 11, SD = 1.414, RSD = 12.86%.

Frequently Asked Questions

When is RSD useful?

RSD is used to compare variability between datasets with different means or units. In chemistry, RSD < 5% often indicates good precision.

RSD vs standard deviation?

SD is in the same units as the data. RSD is dimensionless (a percentage), making it easier to compare across different measurements.