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Standard Error Calculator

Compute the standard error of the mean (SEM) from the sample standard deviation and sample size, SEM = s/√n. Quantifies how precisely a sample mean estimates the underlying population mean — the foundation of confidence intervals, t-tests, and any inferential statistic.

Standard Deviation

Sample Size

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Statistics

Standard Error Calculator

Calculate the standard error of the mean to measure how precisely your sample mean estimates the true population mean. Use it in research reports, quality control, and any analysis where you need to quantify sampling variability.

Population Standard Deviation

Sample Size (n)

Population Size (optional)

Finite Population Correction

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Key differences

	Standard Error Calculator	Standard Error Calculator
Category	Statistics	Statistics
Inputs required	2	4
Result	Standard Error	Standard Error
What it does	Compute the standard error of the mean (SEM) from the sample standard deviation and sample size, SEM = s/√n. Quantifies how precisely a sample mean estimates the underlying population mean — the foundation of confidence intervals, t-tests, and any inferential statistic.	Calculate the standard error of the mean to measure how precisely your sample mean estimates the true population mean. Use it in research reports, quality control, and any analysis where you need to quantify sampling variability.