Ratio & proportion tools
Equivalent Ratio Calculator
Complete an equivalent ratio such as 2:3 = 10:? and see the multiplier behind it.
Leave exactly one box empty — that is the value SnapRatios will find.
2 : 3 = 10 : ?
Exact result
15
D = 15 · completed proportion 2 : 3 = 10 : 15
Working
- Cross-multiply: d = (b × c) ÷ a
- 3 × 10 = 30
- 30 ÷ 2 = 15
Equivalent ratios
| Multiplier | Ratio |
|---|---|
| ×1 | 2 : 3 |
| ×2 | 4 : 6 |
| ×3 | 6 : 9 |
| ×4 | 8 : 12 |
| ×5 | 10 : 15 |
| ×6 | 12 : 18 |
What makes two ratios equivalent
Two ratios are equivalent when both parts have been multiplied or divided by the same number. 2:3 and 10:15 are equivalent because both parts of 2:3 were multiplied by 5. Equivalent ratios always reduce to the same simplest form.