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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)

Fill in the required fields to see your result.

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

Fill in the required fields to see your result.

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.