Square Root Curve Calculator
Convert a raw grade to a square-root curved grade — √score × 10.
Enter your values
Enter the raw score in %.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Curved score
- 80 %
- Points gained
- 16
Working
- 1√64 = 8
- 2× 10 = 80
| Raw score | Curved score |
|---|---|
| 30 | 54.8 |
| 40 | 63.2 |
| 50 | 70.7 |
| 60 | 77.5 |
| 70 | 83.7 |
| 80 | 89.4 |
| 90 | 94.9 |
| 100 | 100 |
Quick answer
A square-root curve replaces a raw percentage with the square root of that percentage times 10. A 64 becomes 80 and a 36 becomes 60; a perfect 100 is unchanged.
curved = √raw × 10
At a glance
| What it does | Convert a raw grade to a square-root curved grade — √score × 10. |
|---|---|
| Category | Education |
| Inputs needed | Raw score |
| Main output | Curved score |
| Formula | curved = √raw × 10 |
| Cost | Free — no sign-up, no download |
How to use the Square Root Curve Calculator
- 1Enter the raw percentage.
- 2Read the curved score.
- 3Use the table to see the curve across the whole range.
Inputs explained
- Raw score(%)
- Enter the raw score in %.
Worked example
Using the values the calculator loads with:
Inputs
- Raw score64 %
Results
- Curved score80 %
- Points gained16
- √64 = 8
- × 10 = 80
Frequently asked questions
How does a square root curve work?
The curve is √raw × 10, so it lifts low scores substantially, lifts middling scores modestly and leaves a 100 untouched.
What does a 50 become on a square root curve?
√50 × 10 ≈ 70.7, so a 50 becomes about a 71.
What do I need to enter into the Square Root Curve Calculator?
Just 1 value: raw score. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Square Root Curve Calculator work out the answer?
A square-root curve replaces a raw percentage with the square root of that percentage times 10. A 64 becomes 80 and a 36 becomes 60; a perfect 100 is unchanged. It applies the formula curved = √raw × 10 and shows the working so you can check each step by hand.
Is the Square Root Curve Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.