Integer to Fraction Converter

Converts a list of integers (one per line) into fractions using a chosen denominator (default 1, minimum 1): each integer N is expressed as (N*denominator)/denominator in already fully-expanded, unreduced form, e.g. N=5, denominator=3 -> "15/3". A free online tool from Staaarter, right in your browser.

Runs locallyUpdated 2026-07-27

Overview

Introduction

This tool takes a list of plain integers and rewrites each one as an equivalent fraction using a denominator you choose, without reducing the result to its simplest form.

It's useful when you need a fraction with a specific denominator for a worksheet, comparison, or demonstration, rather than the mathematically simplest representation.

What Is Integer to Fraction Converter?

A converter that takes a list of integers, one per line, plus a denominator, and outputs each integer expressed as a fraction over that denominator.

Each integer N becomes (N times the denominator) over the denominator, which is always mathematically equal to N but written in expanded fractional form.

How Integer to Fraction Converter Works

Each line is parsed as a whole number.

The tool multiplies that number by your chosen denominator to get the fraction's numerator.

The result is formatted as "numerator/denominator", with no simplification applied.

When To Use Integer to Fraction Converter

Use it to generate fraction practice problems or examples with a specific, consistent denominator.

It's also useful for demonstrating that a single integer can be written as infinitely many equivalent fractions.

Features

Advantages

  • Gives full control over the denominator used, unlike a tool that always reduces to lowest terms.
  • Simple, predictable output that's easy to verify by hand.

Limitations

  • Doesn't simplify or reduce the resulting fraction; if you want the simplest form, set the denominator to 1.
  • Only supports positive whole-number denominators of 1 or more.

Examples

Default denominator

Input

5, denominator: 1

Output

5/1

Custom denominator

Input

5, denominator: 3

Output

15/3

Best Practices & Notes

Best Practices

  • Set the denominator to 1 if you just want each integer written in the simplest "N/1" fractional form.

Developer Notes

The numerator is computed as a straightforward `n * denominator` with no GCD-based reduction step, since the tool's entire purpose is producing the expanded, unreduced form rather than the simplified one.

Integer to Fraction Converter Use Cases

  • Generating fraction worksheets or examples with a fixed denominator
  • Demonstrating that a whole number has infinitely many equivalent fractional forms
  • Producing test input for the companion Fraction to Integer Converter

Common Mistakes

  • Expecting the output to be simplified; it's intentionally left in expanded, unreduced form.
  • Entering a denominator of 0 or a negative number, which is rejected since only whole numbers of 1 or more are supported.

Tips

  • Feed the output of this tool into the Fraction to Integer Converter to confirm it correctly recovers the original integer.

References

Frequently Asked Questions