Ratio Calculator - Simplify and Solve Ratios
Free ratio calculator. Simplify a ratio, or solve a proportion by leaving one value blank. See the simplified ratio, decimal and a visual comparison. Private and offline.
Simplify a ratio or solve a proportion. Fill all four boxes to compare two ratios, or leave exactly one box blank and the tool solves for it. Updates instantly in your browser.
Leave one box blank to solve for it.
How to Use Ratio Calculator - Simplify and Solve Ratios
- Enter the first ratio. Put one number on each side of the first colon, such as 3 and 4.
- Choose what to do. To simplify, fill the first ratio and leave the rest. To solve a proportion, fill three boxes and leave one blank.
- Read the result. See the missing value, or the simplified ratio, at the top.
- Check the comparison. The two bars show each ratio visually, so equivalent ratios line up.
- Save it. Copy the result, print a clean report, or copy a share link with your numbers.
Frequently Asked Questions
How do I simplify a ratio?
Divide both sides by their greatest common divisor. For example, 8 to 12 divides by 4 to become 2 to 3. The tool reduces whole number ratios to their lowest terms automatically.
How do I solve a proportion?
Set the two ratios equal and cross multiply. For 3 to 4 equals 9 to x, multiply 4 by 9 and divide by 3 to get 12. Leave the unknown box blank and the tool does this for you.
What does equivalent mean here?
Two ratios are equivalent when they reduce to the same simplest form, such as 1 to 2 and 4 to 8. The tool tells you whether the two ratios you entered are equal.
Can I use decimals?
Yes. You can enter decimal values. When a ratio has decimals it is shown in the form value to 1 rather than as whole numbers.
Is my data sent anywhere?
No. Everything runs in your browser. The numbers you enter never leave your computer and the tool works offline once loaded.
What can I use ratios for?
Ratios scale recipes, mix paint or fuel, set aspect ratios, and convert map scales. The proportion solver is handy whenever you need to keep the same ratio at a different size.