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

Statistical Power Calculator

Determine the statistical power of a hypothesis test given effect size, sample size, and alpha level. Use it when designing experiments to confirm you have enough participants to detect a real effect.

Effect Size (Cohen's d)

Sample Size per Group

Alpha Level

Test Direction

Fill in the required fields to see your result.

Statistics

Linear Regression Calculator

Fit a least-squares regression line y = a + b·x to paired x and y values and read off the slope, intercept, or coefficient of determination (r²). Used in forecasting, trend analysis, and any setting where you want to quantify how much y changes with x.

X Values (comma separated)

Y Values (comma separated)

Output

Fill in the required fields to see your result.

Key differences

	Statistical Power Calculator	Linear Regression Calculator
Category	Statistics	Statistics
Inputs required	4	3
Result	Statistical Power	Result
What it does	Determine the statistical power of a hypothesis test given effect size, sample size, and alpha level. Use it when designing experiments to confirm you have enough participants to detect a real effect.	Fit a least-squares regression line y = a + b·x to paired x and y values and read off the slope, intercept, or coefficient of determination (r²). Used in forecasting, trend analysis, and any setting where you want to quantify how much y changes with x.