A walkthrough, end to end.
- 1
Pick a mode: simplify, scale to a target, or solve a proportion.
- 2
Enter the values; the calculator returns the result in lowest terms.
- 3
Use for cooking, scaling drawings, mixing chemicals, and any A:B comparison.
Ratio operations
Simplify: divide both terms by their GCD. Scale: multiply both terms by the same factor. Solve A:B = C:? — cross multiply: A × ? = B × C, so ? = (B × C) / A.
What you can do with this.
Recipe scaling
Recipe is 2:3 flour to water. Want to make double the batch: 4:6 = 2:3 (proportional). Or scale to 8 cups water → 16/3 ≈ 5.33 cups flour. The calculator's solve mode does this directly.
Map / blueprint scale
Map shows 1:50,000 ratio. 4 cm on map = 200,000 cm = 2 km in reality. The calculator's solve mode converts between map and real distances quickly.
Aspect ratio
16:9 widescreen. For 1920px wide, height = 1920 × 9/16 = 1080. The calculator solves the proportion directly.
Mixing chemicals
Recipe: 1:8 chemical to water. Need 250 ml total → 1/9 × 250 = 27.8 ml chemical, 222.2 ml water. Use solve mode with the parts.
Simplify ratios
Mix of 12:18 → divide both by GCD(12,18)=6 → 2:3. The simplified form is what you'd write on a recipe or drawing scale.
Compound ratio
If a:b = 2:3 and b:c = 4:5, then a:b:c = 8:12:15 (multiply each ratio's terms to share the b value). Useful for multi-component mixtures.
Body proportions / golden ratio
Golden ratio φ ≈ 1.618. Used in art, design, and architecture. Use the calculator to solve dimensions matching golden ratio.
Ratio calculator 2026 — what's current
Spreadsheets and calculators handle ratios reliably. The calculator is fastest for one-off conversions; spreadsheets win when you need to compute many at once.
Frequently asked.
Ratios compare quantities of the same type or unit. Fractions are part-of-whole. 3:4 (ratio) and 3/4 (fraction) look similar; the difference is in interpretation.
Multiply both sides by 10ⁿ to clear decimals first, then simplify by GCD. 1.5:2.25 → multiply by 100 → 150:225 → divide by 75 → 2:3.
Mathematically yes (e.g., 0:5), but it usually loses meaning — a ratio compares quantities. If one is zero, it's just saying 'none of the first kind'.
No. Calculations run entirely in your browser.