Ratio Calculator
Simplify ratios, solve proportions (find missing value), and scale ratios. Works for 2-part and 3-part ratios. Free and instant.
Ratio Calculator
toolznova.com • Free Calculator
How to Use
Calculate ratios in 3 steps.
Choose Mode
Select simplify, solve proportion, or scale ratio.
Enter Values
Enter the ratio values or proportion numbers.
Get Result
Click Calculate for simplified ratio or missing value.
Why ToolzNova?
Instant
Results in milliseconds.
Accurate
Precise formulas every time.
Private
No data sent anywhere.
Everywhere
Mobile, tablet, desktop.
Why Calculate Ratios?
- Recipes: Scale recipe ingredients maintaining correct proportions.
- Maps: Map scale ratios for distance calculation.
- Finance: Financial ratios for business performance analysis.
- Art & Design: Maintain aspect ratios when resizing images.
- Chemistry: Mixing ratios for solutions and reactions.
- Engineering: Gear ratios, speed ratios, and material mixing.
Tips & Examples
- To simplify a:b, divide both by their GCD.
- Proportion a:b = c:x means a/b = c/x, so x = b×c/a.
- 3:4 ratio means for every 3 of A there are 4 of B.
- Scale factor 2 turns 3:4 into 6:8 — same ratio, larger values.
- Golden ratio ≈ 1:1.618 — found throughout art and nature.
- Aspect ratio 16:9 — standard widescreen display format.
Free Ratio Calculator Online
ToolzNova's free ratio calculator simplifies ratios to lowest terms, solves proportion problems (finding the missing value), and scales ratios by any factor — three essential ratio operations in one tool.
Ratios compare quantities and are fundamental in mathematics, cooking, chemistry, engineering, and finance. Proportions extend ratios to find unknown values when two ratios are equal.
Ratio Formulas
Simplification: divide a:b by GCD(a,b). Proportion: a/b = c/x → x = (b×c)/a. Scaling: multiply both parts by the scale factor.