Reciprocal Calculator
Enter a number to find its reciprocal.
This result is an estimate only. Double-check important figures before relying on them.
How it is calculated
- Reciprocal = 1 ÷ x
- The fraction form flips the number written as a fraction in lowest terms
To divide numbers or fractions, use the fraction calculator.
Worked example
- The reciprocal of 4 is 0.25, or 1/4
- The reciprocal of 0.8 is 1.25, or 5/4
Why your number may differ
The fraction is found from up to 8 decimal places. A number like 0.333333 is not treated as 1/3.
Frequently asked questions
What is a reciprocal?
The number you multiply by to get 1. The reciprocal of 4 is 1/4, because 4 × 1/4 = 1.
How do I find the reciprocal of a fraction?
Flip it upside down. The reciprocal of 2/3 is 3/2. You can type the decimal 0.666667 only as an approximation.
Why does zero have no reciprocal?
Because no number multiplied by 0 gives 1, and 1 ÷ 0 is undefined.