Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Probability
Statistical Power Calculator
Calculates the statistical power of a hypothesis test or the sample size needed to detect a given effect. Use it when designing experiments to ensure your study can reliably detect meaningful differences.
Fill in the required fields to see your result.
Probability
Hypothesis Testing Calculator
Run a one-sample t-test to decide whether a sample mean differs significantly from a hypothesised population mean. Returns 1 (reject the null hypothesis) or 0 (fail to reject) at your chosen confidence level using the one-sample t-statistic and a critical-value lookup.
Fill in the required fields to see your result.
Key differences
| Statistical Power Calculator | Hypothesis Testing Calculator | |
|---|---|---|
| Category | Probability | Probability |
| Inputs required | 4 | 6 |
| Result | Statistical Power | Reject Null Hypothesis |
| What it does | Calculates the statistical power of a hypothesis test or the sample size needed to detect a given effect. Use it when designing experiments to ensure your study can reliably detect meaningful differences. | Run a one-sample t-test to decide whether a sample mean differs significantly from a hypothesised population mean. Returns 1 (reject the null hypothesis) or 0 (fail to reject) at your chosen confidence level using the one-sample t-statistic and a critical-value lookup. |