⚖️ Ratio Calculator
A ratio like 2:4 compares two amounts, but its simplest form 1:2 is easier to read and use. Simplifying just divides both parts by their greatest common divisor — the same idea as reducing a fraction.
Enter the two parts and, optionally, a quantity to split. The calculator reduces the ratio and divides the quantity into matching shares, so 120 split 1:2 becomes 40 and 80.
How to use this calculator
Type the two parts of the ratio and, if you want, a quantity to split, then press Calculate.
- Type the first part of the ratio into the Ratio part A field.
- Type the second part into the Ratio part B field.
- Optionally type an amount into the Quantity to split field, for example a bill total or a recipe batch.
- Press Calculate to see the simplified ratio and the two proportional shares.
Frequently asked questions
What does this ratio calculator do?
It reduces any ratio to simplest form by dividing both parts by their greatest common divisor, and it can split a quantity into two shares that match the ratio. A 2:4 ratio simplifies to 1:2.
How does splitting by ratio work?
Each share gets its fraction of the total: the first share is quantity times A/(A+B) and the second is quantity times B/(A+B). Splitting 120 in the ratio 1:2 gives 40 and 80.
Can it handle decimal ratios?
Yes. Ratios like 1.5 : 2.5 are scaled to whole numbers first, then simplified, giving 3:5 in that example.
Where are ratios used?
In recipes, paint and concrete mixing, map scales, financial ratios, and splitting costs fairly when people use different shares of something.