Statistics

Effect Size Calculator

The effect size calculator computes Cohen’s d, the correlation coefficient, and the var...

Results

Margin of Error
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CI Lower
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CI Upper
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About the Effect Size Calculator

This calculator helps you quickly compute results with precision. Simply enter your values and get instant results.

How to Use

  1. Enter the required values in the input fields
  2. Results update automatically in real-time
  3. Review the calculation steps for transparency

Formula

CI = x̄ ± z·(σ/√n)

Examples

Try different input values to see how the result changes. This helps you understand the relationship between variables.

Formula

CI = x̄ ± z·(σ/√n)

Our calculator uses standard mathematical formulas to provide accurate results. Always verify critical calculations independently.

Yes, all our calculators are completely free with no registration required.

Yes, use the embed feature to add this calculator to your website.

User Reviews

4.8
Based on 436 reviews
Hannah I.
1 year ago

Found this Effect Size Calculator while studying for exams. The step-by-step breakdown helped me understand the concept, not just the answer.

Olivia N.
2 days ago

Perfect Effect Size Calculator for quick estimates. I used it while planning a home renovation and it was spot on.

Emily W.
6 weeks ago

Reliable Effect Size Calculator that works every time. I have tried many online calculators — this is one of the best.

Megan F.
6 weeks ago

I run calculations with this Effect Size Calculator every Monday morning. Fast, dependable, and always available.