Fraction to Percent Calculator
Last updated: November 5, 2026
Convert a numerator and denominator to a percentage, decimal, simplified fraction and ratio.
Percentage
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- Decimal: —
- Simplified fraction: —
- Ratio: —
On this page
Quick summary: Convert a numerator and denominator to a percentage, decimal, simplified fraction and ratio.
Read the complete guide
Updated reference sections in this guide are in English.
What this calculator estimates
Convert a numerator and denominator to a percentage, decimal, simplified fraction and ratio.
How to use it
Enter Numerator; Denominator. Select Calculate to update the results.
How the calculation works
Divide the numerator by the denominator, then multiply by 100.
Worked example: starting scenario
| Numerator | 3 |
|---|---|
| Denominator | 8 |
| Percentage | 37.5% |
|---|---|
| Decimal | 0.375 |
| Simplified fraction | 3/8 |
| Ratio | 3:8 |
Important limitations
The denominator cannot be zero. Large percentages are valid when the numerator is larger than the denominator.
A fraction can exceed one whole
The denominator defines the whole. For 7/4, divide 7 by 4 to obtain 1.75, then multiply by 100 to obtain 175%. A negative denominator is moved to the numerator in the simplified fraction. Zero over a nonzero denominator is valid and gives 0%; division by zero is undefined. Integer components must be within the exact supported input range.