How this works in your browser
Both methods are additive shifts rather than redistributions. Scaling to the top score computes the gap between the highest score and your target maximum and adds that same amount to every score; the flat method adds a number you choose. Because each adds a constant, the gaps between students are preserved exactly, so the ranking and the spread are unchanged and only the overall level moves. Results are capped at the maximum, which is the one place the transformation stops being uniform. This is deliberately different from curving to a fixed distribution, which forces a predetermined proportion into each grade regardless of how the class actually performed.
Grade Curve Calculator vs. typical online calculators
| Feature | Grade Curve Calculator (in-browser) | Typical online calculators |
|---|---|---|
| Where the maths runs | In your browser, on your device | Often posted to a server to compute |
| Your inputs are stored | Never - nothing is sent or saved | Frequently logged with your session |
| Works offline once loaded | Yes | No - needs a live connection |
| Ads inside the result area | None | Common on free calculators |
| Account required | No | Often, to save or export results |
| Usage limits | None - free, unlimited use | Sometimes capped per day |
Who uses Grade Curve Calculator
Adjusting for a hard test
Lift a whole class when an assessment proved harder than intended.
Compensating for a flawed question
Add points for a question that was ambiguous or unfair.
Reviewing a distribution
See how a proposed adjustment would change the spread before committing.
Comparing curving options
Try both methods on the same scores to see which produces a fairer result.
How to use Grade Curve Calculator
- 1
Open the Grade Curve Calculator
Go to tools.slaytic.com and open the Grade Curve Calculator. No sign-up or account required.
- 2
Paste your scores
Separate them with commas, spaces or new lines in any combination.
- 3
Choose a curving method
Scale so the top score reaches your target, or add a flat number of points.
- 4
Review the curved results
Check the distribution before applying it to your gradebook.
Frequently asked questions
What curving methods are available?
"Curve so the highest = target" shifts every score up by the same amount so the top score reaches your target maximum. "Add a flat number of points" simply adds a fixed number of points to every score.
Can curved scores exceed the target maximum?
No, curved scores are capped at the target maximum you set, so no student can score above it after curving.
How do I enter scores?
Separate scores with commas, spaces, or new lines - any combination works.
Which curving method should I use?
Scaling to the top score suits a test that was harder than intended, since it lifts everyone by the same amount the best student fell short by. A flat addition suits a specific known problem, such as an ambiguous question worth five marks. Both preserve the ranking; neither changes who did better than whom.
Does curving actually help students?
These methods do, because both raise every score. What does not is curving to a fixed distribution, where a set proportion must receive each grade regardless of performance. That approach turns a class into competitors rather than a cohort, and it is worth distinguishing from the additive methods here.
Why are curved scores capped at the maximum?
Because a score above the maximum is not meaningful on most grading systems and creates problems downstream in gradebooks and transcripts. Capping means students already near the top gain less, which is an unavoidable consequence of having a ceiling at all.
Are my students' scores transmitted anywhere?
No. The calculation runs in your browser, so a class's marks are never uploaded, which matters given student grades are protected data in most jurisdictions.