Ratio Calculator
Solve ratios and scale them instantly! Enter values for A:B = C:D, or enlarge/shrink any ratio by a scale factor.
Perfect for adjusting recipes, scaling drawings, or solving math problems. Fast, accurate, and easy-to-use — no formulas needed!
Ratio Calculator – How It Works
The Ratio Calculator is a versatile tool designed to help you solve problems involving proportional relationships quickly and accurately. It supports three main modes:
- Find an equivalent ratio (A:B = C:D): Solve for a missing value by entering at least three known values. Example: If C = 6, D = 9, and B = 4 (A left blank), the calculator will find A.
- Enlarge a ratio: Multiply both parts of a ratio by a scale factor to increase its size proportionally.
- Shrink a ratio: Divide both parts of a ratio by a scale factor to reduce it proportionally.
Ratios are everywhere — from cooking and baking to scaling models, drawings, or financial comparisons. With this tool, you can:
- Adjust ingredients accurately for recipes.
- Scale drawings, blueprints, or models precisely.
- Compare quantities in finance, business, or data analysis.
- Quickly solve math problems involving proportions and percentages.
The calculator ensures accurate results and provides clear feedback if inputs are incomplete or invalid. It's perfect for students, professionals, and anyone working with ratios in daily life.
How to use:
- Choose a mode from the dropdown: Find an equivalent ratio, Enlarge, or Shrink.
- Enter values for A and B. If using the ratio mode, also enter at least one value for C or D.
- For Enlarge or Shrink, enter the scale factor.
- Click Calculate to see the result instantly.