Ratio Calculator
Simplify a ratio and get its decimal and percentage form.
Result
Simplified ratio
16 : 9
Decimal (A ÷ B)
1.7778
A as % of total
64.00
How it works
A ratio expresses the relationship between two quantities — how much of one there is compared to another, written like 3:2. This calculator simplifies a ratio to its lowest terms and can scale it up or down while keeping the proportion intact. To simplify, both sides are divided by their greatest common divisor: 8:12 becomes 2:3. To scale, you multiply both sides by the same number: doubling 2:3 gives 4:6, which represents exactly the same proportion. Ratios are everywhere — mixing fuel, adjusting a recipe, setting screen aspect ratios, or splitting a bill. Whenever you need to keep two amounts in balance as the total changes, a ratio is the tool.
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Frequently asked questions
How do I simplify a ratio?
Divide both sides by their greatest common divisor. For 8:12 the divisor is 4, giving the simplified ratio 2:3.
What is the difference between a ratio and a fraction?
A fraction compares a part to the whole (2/5), while a ratio compares two parts to each other (2:3). They are related but answer different questions.
How do I scale a recipe with a ratio?
Multiply every ingredient by the same factor. To double a 2:3 mix, use 4:6 — the proportion stays identical.
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