Decimal to Ratio Calculator

Enter a decimal below to convert it to a ratio.

How to Convert a Decimal to a Ratio

You might come across a need to express a decimal as a ratio, and that’s possible to do in a few easy steps.

Step One: Express the Decimal to a Fraction

The first step in converting a decimal to a ratio is to first express the decimal as a fraction. There is a handy calculator to do that, but you can also do it yourself.

To convert a decimal to fraction, start by placing the decimal as the numerator over the denominator of 1. Then, continue multiplying both the numerator and denominator by 10 until the numerator is a whole number.

You can optionally reduce the fraction at this point.

Step Two: Rewrite the Fraction as a Ratio

The second step in converting a decimal to a ratio is to rewrite the fraction in ratio form. To do so, place the numerator in front of the denominator and separate them with a colon (:) symbol.

For example, convert 3.5 to a ratio.

Start by converting 3.5 to a fraction.
3.5 = 3.51
3.5 = (3.5 × 10)(1 × 10)
3.5 = 3510

Then reduce.
3510 = (35 ÷ 5)(10 ÷ 5)
3510 = 72

Finally, rewrite as a ratio.
72 = 7:2

Thus, the ratio is 7:2

You’ll probably also find our ratio to decimal calculator useful.