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Vocabulary Retention Rate Calculator
Estimate how many new words you will remember after review sessions using a forgetting curve.
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Retention
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Estimate how many new words you will remember after review sessions using a forgetting curve.
Vocabulary Retention Rate Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Retention = e^(-days / stability), with stability growing for each review.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Vocabulary Quick Guide
Typical values for reference.
| New words | Days | Reviews | Retention |
|---|---|---|---|
| 50 | 7 | 0 | 10% |
| 50 | 7 | 1 | 39% |
| 50 | 7 | 3 | 65% |
| 50 | 7 | 5 | 76% |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Vocabulary Retention Rate Calculator FAQ
Answers to common questions about this calculator.
The decline of memory over time without review.
Each spaced review makes memories last longer.
Just before you would forget.
No, it is a model.