Percent to Decimal Calculator
Turn a percentage into a decimal — divide by 100.
Dividing by 100 converts a percentage back to the decimal it stands for: 75% is 0.
How the percent to decimal calculator works
Dividing by 100 converts a percentage back to the decimal it stands for: 75% is 0.75. Move the decimal point two places left.
This is the step that matters in a spreadsheet, because arithmetic uses the decimal. Multiplying by 75 instead of 0.75 is a factor-of-a-hundred error and one of the most common mistakes in a formula.
Formula: X% of Y = Y × X / 100; X as % of Y = X / Y × 100; change = (B − A) / A × 100
Worked examples
| Inputs | Answer | Note |
|---|---|---|
| 75% | 0.75 | 0.75 |
| 5% | 0.05 | 0.05 |
| Over one hundred | 1.2 | 1.2 |
FAQFrequently asked questions
How do I convert a percentage to a decimal?
Divide by 100, or move the decimal point two places left. 75% becomes 0.75.
What is 5% as a decimal?
0.05.
Why does my spreadsheet give the wrong answer?
Almost always because a percentage was used as a whole number. Multiply by 0.075 for 7.5%, not by 7.5.
What is 100% as a decimal?
1.
What about percentages above 100?
They become decimals above 1: 120% is 1.2.
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)
- Australian Curriculum (ACARA) — Mathematics — the terms and methods taught in Australian schools
Last checked: September 2026. Formulas are fixed by mathematics and do not change with tax years or regulations.