Calculate sample size for power in research & statistics.
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Research & Statistics — Power: Statistical Power Calculator
Quick answer
For Research & Statistics — Power: Statistical Power Calculator: if type II error (beta) is 20%, the statistical power is 80%.
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Statistical power
80%
Expressed as a percentage of the relevant total.
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Statistical power
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Statistical power by type II error (beta)
If type II error (beta) goes from 20% to 30%, statistical power changes from 80% to 70% (−13%).
| Type II error (beta) | Statistical power |
|---|---|
| 10% | 90% |
| 15% | 85% |
| 20%start | 80% |
| 30% | 70% |
| 40% | 60% |
RESEARCH & STATISTICS GUIDE
A quick guide to Research & Statistics — Power: Statistical Power Calculator
Use it to get an accurate statistical power in seconds — free, with no sign-up.
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See your statistical power the moment you enter your numbers.
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How to Use the Research & Statistics — Power: Statistical Power Calculator
1
Enter Type II error (beta)
Provide your type II error (beta), in %.
2
View Your Results
Get your statistical power instantly, calculated on our server.
What is Research & Statistics — Power: Statistical Power Calculator?
This research & statistics tool works out your statistical power instantly, so you don't have to do the math by hand.
“One quick calculation, so you always know your statistical power before you decide.”
What Affects Your Statistical power
Your statistical power depends on the values below.
Type II error (beta)
Changing your type II error (beta) changes your statistical power. Typically between 0 and 100 %.
Example Result
Here's what you can expect from a research & statistics — power: statistical power calculator calculation:
- Type II error (beta)
- 20 %
- Statistical power
- 80%
Frequently Asked Questions
- How does type II error (beta) affect statistical power?
- If type II error (beta) goes from 20% to 30%, statistical power changes from 80% to 70% (−13%).
- How to calculate research & statistics — power: statistical power calculator?
- Fill in type II error (beta) in the Research & Statistics — Power: Statistical Power Calculator above and your statistical power is calculated instantly. Change any value to see how the result responds.
- What does an example research & statistics — power: statistical power calculator calculation look like?
- For Research & Statistics — Power: Statistical Power Calculator: if type II error (beta) is 20%, the statistical power is 80%.
- Is this calculator free to use?
- Yes — every calculator on this site is completely free, with no sign-up or account required.
- How accurate is this calculator?
- It uses the standard formula and calculates on our server for every request, so results are precise for the values you enter.
- Is my data saved anywhere?
- No. Nothing you enter is stored or sent anywhere unless you choose to share a link with your values included.
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