Decimal to Percent Calculator
Turn a decimal into a percentage — multiply by 100.
Per cent means "per hundred", so a decimal becomes a percentage by multiplying by 100: 0.
How the decimal to percent calculator works
Per cent means "per hundred", so a decimal becomes a percentage by multiplying by 100: 0.75 is 75%.
The shortcut is to move the decimal point two places right. 0.05 becomes 5%, and 1.2 becomes 120% — percentages above 100 are perfectly ordinary and simply mean more than the whole.
Formula: X% of Y = Y × X / 100; X as % of Y = X / Y × 100; change = (B − A) / A × 100
Worked examples
| Inputs | Answer | Note |
|---|---|---|
| 0.75 | 75% | 75% |
| 0.05 | 5% | 5% |
| More than the whole | 120% | 120% |
FAQFrequently asked questions
How do I convert a decimal to a percentage?
Multiply by 100, or move the decimal point two places right. 0.75 becomes 75%.
What is 0.05 as a percentage?
5%.
Can a percentage be over 100?
Yes. 1.2 is 120%, meaning more than the whole.
What is 1 as a percentage?
100% — the whole thing.
Why does moving the point two places work?
Because multiplying by 100 shifts every digit two places up.
Where these figures come from
- NIST Digital Library of Mathematical Functions — reference definitions for elementary and special functions
- Wolfram MathWorld — definitions and formulas for every topic on this page
- NIST/SEMATECH e-Handbook of Statistical Methods — the statistical formulas (mean, variance, z, confidence intervals, sample size)
- Common Core State Standards — Mathematics — the terms and methods taught in US schools
Last checked: September 2026. Formulas are fixed by mathematics and do not change with tax years or regulations.