Sample Size Calculator – 95% confidence, 1% margin

Find required sample size for 95% confidence and 1% margin of error. Enter proportion or variability; we solve for n. For planning only.

Basic statistics

Numbers (comma or space separated)10, 20, 30, 40, 50

Enter numbers to compute.

How it works

We solve for n given confidence level and margin of error. Result depends on assumed proportion or SD.

When to use it

Use when designing surveys or A/B tests.

Frequently asked questions

What if I don't know proportion?

Use 0.5 for maximum required n.

For finite population?

We can apply finite population correction if you enter population size.