Calculate sample size for survey in research & statistics.
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Research & Statistics — Survey: Effect Size Calculator
Quick answer
For Research & Statistics — Survey: Effect Size Calculator: if group a mean is 78, group b mean is 72 and standard deviation is 12, the effect size is 0.5.
Enter your values
Effect size
0.5
Calculated directly from the values you entered above.
You enter Group A mean 78, Group B mean 72, Standard deviation 12. You get Effect size 0.5.
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See how the result changes
Each table re-runs this calculator with one value changed and everything else left as it is.
Effect size by group a mean
If group a mean goes from 78 to 117, effect size changes from 0.5 to 3.75 (+650%).
| Group A mean | Effect size |
|---|---|
| 39 | −2.75 |
| 58.5 | −1.13 |
| 78start | 0.5 |
| 117 | 3.75 |
| 156 | 7 |
Effect size by group b mean
If group b mean goes from 72 to 108, effect size changes from 0.5 to −2.5 (−600%).
| Group B mean | Effect size |
|---|---|
| 36 | 3.5 |
| 54 | 2 |
| 72start | 0.5 |
| 108 | −2.5 |
| 144 | −5.5 |
Effect size by standard deviation
If standard deviation goes from 12 to 18, effect size changes from 0.5 to 0.33 (−33%).
| Standard deviation | Effect size |
|---|---|
| 6 | 1 |
| 9 | 0.67 |
| 12start | 0.5 |
| 18 | 0.33 |
| 24 | 0.25 |
RESEARCH & STATISTICS GUIDE
A quick guide to Research & Statistics — Survey: Effect Size Calculator
Use it to get an accurate effect size in seconds — free, with no sign-up.
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See your effect size the moment you enter your numbers.
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How to Use the Research & Statistics — Survey: Effect Size Calculator
1
Enter Group A mean
Provide your group a mean.
2
Enter Group B mean
Provide your group b mean.
3
Enter Standard deviation
Provide your standard deviation.
4
View Your Results
Get your effect size instantly, calculated on our server.
What is Research & Statistics — Survey: Effect Size Calculator?
This research & statistics tool works out your effect size instantly, so you don't have to do the math by hand.
“One quick calculation, so you always know your effect size before you decide.”
What Affects Your Effect size
Your effect size depends on the values below.
Group A mean
Changing your group a mean changes your effect size.
Group B mean
Changing your group b mean changes your effect size.
Standard deviation
Changing your standard deviation changes your effect size.
Example Result
Here's what you can expect from a research & statistics — survey: effect size calculator calculation:
- Group A mean
- 78
- Group B mean
- 72
- Standard deviation
- 12
- Effect size
- 0.5
Frequently Asked Questions
- How does group a mean affect effect size?
- If group a mean goes from 78 to 117, effect size changes from 0.5 to 3.75 (+650%).
- How does group b mean affect effect size?
- If group b mean goes from 72 to 108, effect size changes from 0.5 to −2.5 (−600%).
- How to calculate research & statistics — survey: effect size calculator?
- Fill in group a mean, group b mean and standard deviation in the Research & Statistics — Survey: Effect Size Calculator above and your effect size is calculated instantly. Change any value to see how the result responds.
- What does an example research & statistics — survey: effect size calculator calculation look like?
- For Research & Statistics — Survey: Effect Size Calculator: if group a mean is 78, group b mean is 72 and standard deviation is 12, the effect size is 0.5.
- 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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