Ratio Calculator
Simplify ratios, find equivalent ratios, convert parts to percentages, and divide a total by a ratio with clear steps.
Want to learn more? Browse our calculation guides and tutorials →
Simplify ratios, find equivalent ratios, convert parts to percentages, and divide a total by a ratio with clear steps.
Want to learn more? Browse our calculation guides and tutorials →
Simplify ratios, find equivalent ratios, scale a ratio, and divide a total by a ratio with clear steps.
Simplify a part-to-part ratio, generate an equivalent ratio, or divide a total in the same ratio.
12:18
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A ratio compares quantities in a fixed order. For 12:18, the GCF is 6, so dividing each term by 6 gives the simplest ratio 2:3.
| Task | Method | Example |
|---|---|---|
| Simplify | a÷GCF : b÷GCF | 12:18 = 2:3 |
| Scale | a×k : b×k | 2:3 × 4 = 8:12 |
| Split total T | T×a/(a+b), T×b/(a+b) | 100 at 2:3 = 40 and 60 |
Use this page to reduce, scale, convert, or split a ratio. To solve an unknown in A/B = C/D, use the Proportion Calculator.
A ratio compares two quantities in order. The ratio 2:3 means two units of the first quantity for every three units of the second.
Convert both quantities to the same unit, find their greatest common factor, then divide both terms by that factor.
A ratio is one comparison, such as 2:3. A proportion is an equation stating that two ratios are equal, such as 2/3 = 8/12.
Yes. Add the ratio terms, divide the total by that sum, and multiply the value of one share by each term.
Yes. Multiplying both terms of 2:3 by 2 gives 4:6, so the ratios describe the same relationship.