How it works
Fill in the 2 fields above and A/B Test Sample Size Calculator calculates the result instantly, recalculating as you change any value. The math runs locally in your browser — nothing is sent to a server.
Examples
- Baseline conversion 5 %, Minimum detectable effect 20 % → Sample size per variant: 7,600
Frequently asked questions
How do I use the A/B Test Sample Size Calculator?
Enter your values in the 2 input fields and the result is calculated automatically as you type. Change any value to see the numbers update instantly.
Is my data private?
Yes. The A/B Test Sample Size Calculator runs entirely in your browser. Nothing you enter is uploaded, saved to a server, or shared — it never leaves your device.
Is the A/B Test Sample Size Calculator free?
Yes, it is completely free with no sign-up, no limits and no watermarks. Like every tool on marketing and the rest of the platform, you can use it as often as you like.
Popular in Marketing
CPM Calculator
Calculate cost per thousand impressions (CPM).
Cost Per Lead (CPL) Calculator
Calculate the average cost per lead.
Customer Acquisition Cost (CAC) Calculator
Calculate the cost to acquire a customer.
eCPM Calculator
Calculate effective cost per thousand impressions from revenue.