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Math Calculators

Reciprocal of a Fraction Calculator

Verified formula Updated Jun 2026 Private — runs on your device

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Verified formula Private

Reciprocal (decimal)

1.333333

Reciprocal numerator
4
Reciprocal denominator
3

For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.

How to use the Reciprocal of a Fraction Calculator

The Reciprocal of a Fraction Calculator works out your reciprocal (decimal), along with 2 related figures in an instant. Enter numerator and denominator and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.

  1. Enter the numerator.
  2. Enter the denominator.
  3. Read off your reciprocal (decimal), together with reciprocal numerator and reciprocal denominator — the calculator updates automatically, with no button to press.

Formula

The Reciprocal of a Fraction Calculator uses the formula:

Reciprocal (decimal) = Denominator ÷ Numerator

Worked example

For example, with numerator of 3 and denominator of 4, the reciprocal (decimal) is 1.333333.

Inputs used
Numerator 3
Denominator 4
Results
Reciprocal (decimal) 1.333333
Reciprocal numerator 4
Reciprocal denominator 3

Results are estimates for educational use, not professional advice.

Frequently asked questions

Swap the numerator and denominator. The reciprocal of 3/4 is 4/3, about 1.333.

Dividing by a fraction is the same as multiplying by its reciprocal, which simplifies the maths.

Write it over 1 and flip it. The reciprocal of 5 is 1/5.

Yes. Any non-zero number multiplied by its reciprocal gives 1.

The Reciprocal of a Fraction Calculator uses the formula: Reciprocal (decimal) = Denominator ÷ Numerator. For example, with numerator of 3 and denominator of 4, the reciprocal (decimal) is 1.333333.

Enter the numerator. Enter the denominator. Read off your reciprocal (decimal), together with reciprocal numerator and reciprocal denominator — the calculator updates automatically, with no button to press.

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