How to use the finite population correction calculator
Adjust a sample size for a small population. Enter initial sample size, population size in the fields above; the adjusted sample size is computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- n0 — Initial sample size
- N — Population size
Worked example
With initial sample size = 385, population size = 2000, the calculator gives adjusted sample size ≈ 323.
Frequently asked questions
What is the formula for the finite population correction calculation?
Adjusted sample size = ceil(n0 / (1+(n0-1) / N)). Here n0 is initial sample size, N is population size.
What inputs do I need for the finite population correction calculator?
You need initial sample size, population size. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.