About the Decimal to Percent Converter
A percentage is a number out of 100, a decimal is a number out of 1, and moving between them is just a matter of multiplying or dividing by 100. This converter does it in both directions and also gives you the closest simple fraction and the value per mille. Type 0.375 and you see 37.5 percent and 3/8. Type 12.5 percent and you see 0.125 and 1/8. It handles numbers above 1, such as 1.25 for 125 percent, and tiny numbers such as 0.004 for 0.4 percent. It is quick for homework, recipes, discounts, grades and data tables.
Updated October 2026
How to use the Decimal to Percent Converter
- 1Choose decimal to percent, or percent to decimal.
- 2Type the number.
- 3Read the converted value in the large result.
- 4Check the fraction and per mille in the table.
- 5Copy the line if you want to paste it.
Quick conversions
- 0.1 = 10% = 1/10.
- 0.25 = 25% = 1/4.
- 0.333… = 33.3% = 1/3.
- 0.5 = 50% = 1/2.
- 0.75 = 75% = 3/4.
- 1.2 = 120% = 6/5.
Common uses
Grades are often given as decimals in calculators and percentages on report cards. Interest rates are quoted as percentages but used as decimals in formulas: 6 percent becomes 0.06 in a loan calculation. Spreadsheet cells store percentages as decimals, so 25% in a cell is really 0.25, which explains why formatting changes the look but not the value.
Here is a short worked example. A test is marked out of 40 and a student scores 34. The decimal is 34 divided by 40, which is 0.85. Moving the decimal point two places to the right gives 85 percent. In reverse, a shop offers 12.5 percent off: dividing by 100 gives 0.125, and multiplying the price by 0.875 (that is, 1 minus 0.125) gives the sale price directly. For a 80 item, the sale price is 70.
Recurring decimals deserve a note. One third is 0.3333… with the threes going on for ever, and 33.33…% as a percent. The converter rounds to a sensible number of digits and finds the nearest simple fraction, so 0.3333333 is shown as 1/3. If you need an exact value, keep the fraction and only round at the very end of a calculation, so that small rounding errors do not build up as you go.
Avoiding mistakes
The most common error is moving the decimal point the wrong way. A quick check: percentages are bigger numbers than their decimals, so if your answer to a decimal to percent conversion is smaller than the starting number, you moved the wrong way. Also, do not confuse percent with percentage points, which measure the difference between two percentages.
Related tools
The Fraction to Percent Converter starts from a fraction, the Decimal to Fraction Converter finds exact fractions, the Percentage Calculator works out percentages of amounts and the Percentage Change Calculator measures growth.
Features
- Both directions
- Matching fraction
- Per mille value
- Works above 100% and below 1%
- Plain, tidy numbers with no floating-point noise
- Free and instant
Frequently asked questions
How do I convert a decimal to a percent?
Multiply by 100, which means moving the decimal point two places to the right and adding a percent sign. 0.375 becomes 37.5%, and 0.05 becomes 5%.
How do I convert a percent to a decimal?
Divide by 100, moving the decimal point two places to the left and dropping the percent sign. 62% is 0.62, and 4.5% is 0.045.
What is 0.5 as a percent?
50 percent. A decimal of 0.5 is half of one, and half is 50 out of 100.
Can a percentage be more than 100?
Yes. 1.5 as a percent is 150 percent, meaning one and a half times the whole. A percentage above 100 shows growth beyond the starting amount.
What is per mille?
Per mille, written ‰, means parts per thousand. It is 10 times a percent: 0.375 is 37.5 percent and 375 per mille. It appears in blood alcohol limits and some statistics.
How do I turn a percentage into a fraction?
Write it over 100 and simplify. 37.5 percent is 37.5/100, or 3/8 after clearing the decimal and simplifying. The tool finds the closest simple fraction for you.