Ratio Calculator
Simplify, compare, and scale ratios.
Enter two numbers to simplify the ratio, see the decimal equivalent, and scale it up or down to any target.
Part of: Everyday Calculators
- Simplified
- 16:9
- A ÷ B
- 1.7778
- B ÷ A
- 0.5625
- As %
- 177.7778%
- 32 : 18
- 80 : 45
- 160 : 90
Before you trust the result
Check the inputs that matter most: dates, rates, units, costs, and any optional fields you skipped. A calculator can only work with the numbers entered here, so use the result as a decision check rather than a final answer when money, health, tax, legal, or safety consequences are involved.
If the result feels surprising, change one input at a time and watch which number moves. That usually shows the real lever behind the decision.
More about this tool
How to use this tool
- Enter values for A and B.
- The simplified form and decimal ratio update automatically.
- Use the scale field to project A onto any new size.
Examples
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Frequently asked questions
› Does this handle decimals?
Yes. Non-integer inputs are shown as-is; only integer pairs are simplified with GCD.
› Can I use this for aspect ratios? Trust & accuracy
Yes — the scale field is perfect for projecting a width onto a known height.
Tips & related reading
See the Everyday Calculators hub →Tips & how-tos
- Simplify and Solve Ratios Quickly
- How Ratio Problems Build Proportional Thinking
- Real-World Ratio Problems and How to Solve Them
- Mean vs Median vs Mode Guide
- Ratio and Proportion Guide
- Fraction Arithmetic Guide
- Mental Math Practice With Calculators
- Everyday Calculators Guide
- How to Calculate Percentage Increase
- How to Calculate a Percent of a Number