Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Standard Deviation Calculator

Instantly find the standard deviation and variance of any numeric data set, choosing between population or sample formulas. Ideal for students, researchers, and analysts summarizing data spread.

Data Values (comma separated)

Calculation Type

Decimal Places

Fill in the required fields to see your result.

Statistics

One-Sample T-Test Calculator

Compute the one-sample t-statistic to test whether your sample mean differs significantly from a known or hypothesised population mean. The first inferential test most students learn — used in survey analysis, quality control, and any single-group comparison against a benchmark.

Sample Mean

Population Mean (H₀)

Sample Standard Deviation

Sample Size

Fill in the required fields to see your result.

Key differences

	Standard Deviation Calculator	One-Sample T-Test Calculator
Category	Statistics	Statistics
Inputs required	3	4
Result	Standard Deviation	T-Statistic
What it does	Instantly find the standard deviation and variance of any numeric data set, choosing between population or sample formulas. Ideal for students, researchers, and analysts summarizing data spread.	Compute the one-sample t-statistic to test whether your sample mean differs significantly from a known or hypothesised population mean. The first inferential test most students learn — used in survey analysis, quality control, and any single-group comparison against a benchmark.