Free survey tools

Calculators to plan your survey and understand its results. They are free, you don’t need an account, and nothing you type leaves your browser.

Sample size calculator

How many responses you need for results you can trust.

Margin of error calculator

How precise the results from the responses you already have are.

Cronbach’s alpha calculator

Check your questionnaire’s reliability with your pilot test data.

Compare two percentages

Find out if the difference between two groups is real or could be chance.

NPS calculator

Get your Net Promoter Score from promoters, passives and detractors.

CSAT calculator

Share of satisfied customers and average score on a 1 to 5 scale.

Response rate calculator

What share of people answered your survey and how many dropped out halfway.

Is it for your thesis?

See the step-by-step guide to running your thesis survey: sample, questionnaire, consent, pilot test and analysis.

The calculation runs in your browser. We don’t store what you type.