All Tools
1049+ free tools

Sample Size Calculator

Minimum sample size for a desired margin of error at 95% confidence, with finite-population correction.

Survey setup

50% = max variance (worst case)

383
Required sample
95%
Confidence
±5%
Margin of error

Related business tools

ROI Calculator
Calculate return on investment (ROI) and annualized ROI for any project or asset.
Break-Even Calculator
Find the units and revenue you need to cover fixed costs based on price and variable cost.
Profit Margin Calculator
Compute gross margin, operating margin, and net margin after tax from revenue, COGS, opex, and tax.
Markup Calculator
Set a price by adding a markup percentage to cost. See selling price and equivalent margin.