½ Fraction to Ratio Calculator

Express a fraction as a two-part ratio using its numerator and denominator.

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Enter details

Enter the numerator.
Denominator must not be zero.
Ratio First Part
3
Ratio Second Part
5
Ratio as Decimal
0.6

Also available in our Android app, with charts and full breakdown tables.

📘 About the Fraction to Ratio

The numerator becomes the first ratio term.

The denominator becomes the second ratio term.

Equivalent ratios can be obtained by multiplying both terms by the same non-zero factor.

🧮 Formula

Formula
a/b = a:b
a/b = a:b

✏️ Worked example

3/5

You enter
Numerator3
Denominator5
You get
Ratio First Part3
Ratio Second Part5
Ratio as Decimal0.6

The fraction 3/5 corresponds to the ratio 3:5.

Try this example →

🧭 How to use this calculator

What you enter

  • NumeratorEnter the numerator.
  • DenominatorDenominator must not be zero.

What you get

  • Ratio First Part
  • Ratio Second Part
  • Ratio as Decimal

💡 Important notes

  • A zero denominator is not allowed.
  • The ratio is shown as two numeric terms because the current output engine is numeric.

❓ Frequently asked questions

How do I turn a fraction into a ratio?

Use the numerator as the first term and denominator as the second term.

Is 1/2 the same as 1:2?

Yes, they represent the same ratio.

Can ratio terms be negative?

Mathematically yes, although ratios in practical applications are usually non-negative.