Decimal to Percent Calculator
Convert any decimal number to a percentage.
Did this tool answer your question?
Thanks — this helps us improve the tool.
How to use this tool
- Enter decimal in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your percent and the full breakdown beneath it.
Multiply a decimal by 100 to convert it to a percentage. For example, 0.85 = 85%.
Formula
Percent = decimal × 100
percent = decimal * 100
How it works
This calculator converts a decimal number to its percentage equivalent by multiplying by 100. The word “percent” means “per hundred,” so multiplying by 100 simply rescales the decimal into the per-hundred representation. The result is the same proportion expressed in a different notation — no rounding is applied beyond standard floating-point precision.
Worked example
- Enter decimal = 0.85.
- Percent = 0.85 × 100 = 85.
Percent = 85%.
Common mistakes to avoid
- Moving the decimal point only one place (multiplying by 10) instead of two places (multiplying by 100).
- Converting a number already expressed as a percent (e.g. entering 45 meaning 45%) and getting 4500%.
- Confusing percentage points with percent change; 0.05 is 5%, but a change from 10% to 15% is 5 percentage points, not 50%.
Key terms
- Decimal
- A number expressed in base-10 notation using a decimal point, such as 0.85.
- Percent
- A proportion expressed as a fraction of 100, denoted by the % symbol.
- Proportion
- A ratio expressing how large one quantity is relative to another.
- Scaling factor
- The multiplier used to convert between representations — here, 100 converts decimal to percent.
Frequently asked questions
- How do you convert a decimal to a percent?
- Multiply the decimal by 100. For example, 0.85 × 100 = 85%.