Percent to Decimal Calculator
Last updated: November 5, 2026
Convert a percentage to a decimal, fraction, ratio and per-thousand value.
Decimal value
—
- Percentage: —
- Fraction approximation: —
- Ratio to 100: —
- Per thousand: —
On this page
Quick summary: Convert a percentage to a decimal, fraction, ratio and per-thousand value.
Read the complete guide
Updated reference sections in this guide are in English.
What this calculator estimates
Convert a percentage to a decimal, fraction, ratio and per-thousand value.
How to use it
Enter Percentage. Select Calculate to update the results.
How the calculation works
Divide the percentage by 100 to convert it to decimal form.
Worked example: starting scenario
| Percentage | 25 |
|---|
| Decimal value | 0.25 |
|---|---|
| Percentage | 25% |
| Fraction approximation | 1/4 |
| Ratio to 100 | 25:100 |
| Per thousand | 250‰ |
Important limitations
Very long repeating fractions are approximated for display.
Percent, decimal and per thousand
A percent is a number per hundred: 2.5% = 2.5/100 = 0.025, while 250% = 2.5. A decimal input of 0.25 in this percentage field means 0.25%, which converts to 0.0025. Negative inputs preserve their sign; the displayed ratio to 100 is not necessarily simplified. The fraction result is an approximation with a limited denominator, so very small values may approximate to 0/1 even when the decimal is nonzero.