As a fraction
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Decimal
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Percentage
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Each part as a fraction of the whole
How to Convert a Ratio to a Fraction
Type the ratio the way you write it, with a colon between the parts.
1
Enter the ratio
Type a two-part ratio like 3:4, or a multi-part ratio like 2:3:5. You can separate the parts with a colon or spaces, and decimal parts such as 1.5:2 work too — they are scaled up to whole numbers automatically.
2
Read the fraction
A two-part ratio a:b is the fraction a/b, shown in lowest terms with its decimal and percentage. So 3:4 becomes 3/4 = 0.75 = 75%. If the parts share a factor, they are reduced first — 6:8 becomes 3/4.
3
See each part of the whole
For any ratio, the calculator also shows each part as a fraction of the total. For 2:3:5 the whole is 10, so the parts are 1/5, 3/10 and 1/2. Need to reduce a single fraction further? The Simplify Fractions Calculator does that, and the Ratio Calculator simplifies or solves the ratio itself.
Frequently Asked Questions
How do I convert a ratio to a fraction?
A two-part ratio a:b is simply the fraction a/b, so the ratio 3:4 becomes the fraction 3/4. If the two numbers share a common factor, divide both by it to reduce: 6:8 becomes 6/8, which reduces to 3/4. This calculator does that automatically — type the ratio and it shows the fraction in lowest terms, along with its decimal and percentage value.
What is the ratio 3:4 as a fraction?
The ratio 3:4 as a fraction is 3/4. Because 3 and 4 have no common factor other than 1, 3/4 is already in lowest terms. As a decimal that is 0.75, and as a percentage it is 75%. Type 3:4 into this calculator and it returns the fraction, decimal and percentage together.
How do I turn a three-part ratio like 2:3:5 into fractions?
A ratio with three or more parts does not collapse to a single fraction; instead each part becomes a fraction of the whole. Add the parts to get the total — 2 + 3 + 5 = 10 — then write each part over that total: 2/10 = 1/5, 3/10 and 5/10 = 1/2. This calculator lists each part as a reduced fraction of the whole and its percentage, so 2:3:5 shows 1/5 (20%), 3/10 (30%) and 1/2 (50%).
How do I convert a ratio to a percentage?
For a two-part ratio a:b, the fraction a/b as a percentage is a ÷ b × 100. For 3:4 that is 3 ÷ 4 = 0.75 = 75%. If you instead want each part's share of the whole, divide the part by the total of all parts: in 3:4 the first part is 3 ÷ 7 ≈ 42.9% of the whole. This calculator shows both — the ratio's fraction as a percentage, and each part as a percentage of the whole.
Can I convert a decimal ratio like 1.5:2 to a fraction?
Yes. Multiply every part by the same power of ten to clear the decimals, then reduce. For 1.5:2, multiply both by 10 to get 15:20, which reduces to 3:4, so the fraction is 3/4. Type a ratio with decimals into this calculator and it scales the parts up to whole numbers and reduces them for you before showing the fraction.