Compare calculators

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

Odds Ratio Calculator

Compute the odds ratio from a 2×2 contingency table to measure the association between an exposure and an outcome. Widely used in epidemiology and case-control studies.

Exposed, with outcome (a)

Exposed, no outcome (b)

Unexposed, with outcome (c)

Unexposed, no outcome (d)

Probability

Sample Size Calculator

Determine the minimum sample size needed for a survey or experiment given your confidence level, margin of error, and population size. Prevents under-powered studies and over-budgeted data collection.

Population Size (N) (people)

Confidence Level

Margin of Error (%)

Response Distribution

Key differences

	Odds Ratio Calculator	Sample Size Calculator
Category	Statistics	Probability
Inputs required	4	4
Result	Odds Ratio	Required Sample Size (samples)
What it does	Compute the odds ratio from a 2×2 contingency table to measure the association between an exposure and an outcome. Widely used in epidemiology and case-control studies.	Determine the minimum sample size needed for a survey or experiment given your confidence level, margin of error, and population size. Prevents under-powered studies and over-budgeted data collection.