Ratio Calculator : Solve Proportions & Simplify Ratios
Solve ratio proportions effortlessly. Fill in any three values in the proportion A:B = C:D to solve for the fourth, or simplify ratios like 45:60 to 3:4.
Interactive Calculator
100% Client-Side EngineSolved Variable (D)
D = 1080
Cross-Multiplication Steps
- • Rearranging for D: D = (B × C) ÷ A
- • Calculation: (9 × 1920) ÷ 16 = 1080
Step-by-Step Examples
Scaling an Image Proportion (16:9)
Finding height for width 1920 with ratio 16:9.
Inputs: A: 16, B: 9, C: 1920, D: ?
Result: D = 1080
D = (9 * 1920) / 16 = 1080 (1920x1080 Full HD).
How to Use This Tool
- To solve a proportion: enter 3 values and leave one blank.
- To simplify: enter values A and B.
- Click Calculate to see the solved value and step-by-step cross-multiplication.
Frequently Asked Questions
Cross-multiply the opposite terms: if A/B = C/D, then A × D = B × C. Divide by the known coefficient to isolate the missing variable.
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