Grade Scale Converter
Need to move a grade from one scale to another — a percentage to a 4.0, or a 20-point mark to 100? Enter the score and the maximum of each scale for a proportional conversion.
Your numbers
Result
- As a percentage
- 85%
- Target scale max
- 4
| Step | Detail |
|---|---|
| Original score | 85 out of 100 |
| As a percentage | 85.0% |
| Rule of three | 85 ÷ 100 × 4 |
| Converted score | 3.40 out of 4 |
How the conversion works
It is a rule of three: score ÷ current max × target max. An 85 out of 100 on a 4.0 scale is 85 ÷ 100 × 4 = 3.4. What stays fixed is the proportion — 85/100 and 3.4/4 both represent the same 85% of the possible points.
Common scales
US schools mix a 100-point percentage scale, a 4.0 GPA scale, and sometimes a straight letter scale. Other countries use 20-point, 10-point or 5-point scales. This converts any numeric scale to any other; for a percentage-to-letter grade, use the letter grade calculator instead, since that uses banded cut-offs, not a straight ratio.
Watch the passing mark
Converting the score does not convert the passing threshold. A 60% (60/100) becomes 2.4 on a 4.0 scale, but the target scale may set passing at a different point. When you switch scales, check the minimum required grade on the new scale too.
Frequently asked questions
Sources
- Proportional conversion (rule of three)
Embed this calculator
Copy the code and paste it into your site or blog. Credit with a link back to Contania is included, and the height adjusts itself.
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<script>window.addEventListener("message",function(e){if(e.data&&e.data.type==="contania:embed-height"){var f=document.querySelector('iframe[src="https://contania.app/embed/education/grade-scale"]');if(f){f.style.height=e.data.height+"px"}}});</script>Related calculators
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