To convert a decimal to a percentage, multiply the decimal by 100 and add the percentage symbol. For example, 0.375 multiplied by 100 equals 37.5, so the decimal 0.375 is equal to 37.5%. Moving the decimal point two places to the right produces the same result.
Use the Percentage Calculator on the homepage to check how a decimal represents a percentage of one whole.
Moving the decimal point two places to the right converts 0.375 into 37.5%.
What Decimal-to-Percentage Conversion Means
A decimal and a percentage can describe the same proportion in two different formats. A decimal expresses the value relative to one whole, while a percentage expresses it relative to 100.
For example, the decimal 0.50 represents one half of a whole. The same proportion written as a percentage is 50%.
Converting decimals to percentages is useful for interpreting probabilities, rates, ratios, test scores, financial figures, survey results, and calculator outputs.
Decimal-to-Percentage Formula
Multiply the decimal value by 100.
Add the percentage symbol to the converted number.
This operation does not change the underlying proportion. It changes only the format used to express it.
Worked Example: Convert 0.375 to a Percentage
Begin with the decimal 0.375.
Multiply 0.375 by 100 to get 37.5.
Add the percentage symbol. The decimal 0.375 equals 37.5%.
Moving the Decimal Point
Multiplying by 100 moves the decimal point two places to the right.
For 0.375, moving the point two places changes the number to 37.5.
When a decimal has fewer visible places, add zeros when necessary. The number 0.4 can be viewed as 0.40, which becomes 40%.
Convert 0.5 to a Percentage
Multiply 0.5 by 100.
The result is 50.
Therefore, 0.5 is equal to 50%.
Convert 0.25 to a Percentage
Multiply 0.25 by 100 to get 25.
Add the percentage symbol.
The decimal 0.25 is equal to 25%.
Convert 0.08 to a Percentage
Multiply 0.08 by 100.
The result is 8.
The decimal 0.08 is equal to 8%, not 0.8%.
Convert 0.007 to a Percentage
Multiply 0.007 by 100 to get 0.7.
Add the percentage symbol to produce 0.7%.
Decimals smaller than 0.01 become percentages smaller than 1%.
Convert a Decimal Greater Than One
A decimal greater than one converts to a percentage greater than 100%.
For example, 1.25 multiplied by 100 equals 125%.
This means the value represents one complete whole plus another quarter of that whole.
Convert a Negative Decimal
A negative decimal converts to a negative percentage using the same multiplication.
The decimal −0.15 multiplied by 100 equals −15%.
Negative percentages may represent a decline, loss, reduction, value below a baseline, or signed mathematical quantity.
How to Convert a Decimal on a Calculator
Enter the decimal and multiply it by 100.
For 0.642, calculate 0.642 × 100. The result is 64.2%.
You can use the Percentage Calculator to check how the decimal compares with one complete whole.
Decimals from Division
Decimals are often produced by dividing a part by a whole.
For example, 18 divided by 24 equals 0.75. Multiplying 0.75 by 100 gives 75%.
This is the same process used when calculating test scores, completion rates, proportions, and shares of a total.
Repeating Decimals
Some divisions produce repeating decimals. One divided by three gives 0.3333…
Multiplying by 100 produces 33.333…%.
Depending on the required precision, this may be presented as 33.3%, 33.33%, or approximately 33%.
Rounding Decimal Percentages
Do not round the original decimal too early when accuracy matters.
For example, converting 0.1267 directly gives 12.67%. Rounding the decimal to 0.13 first would give 13%, which is less precise.
Complete the conversion before rounding the final percentage.
Decimal, Fraction, and Percentage Equivalents
The decimal 0.5, fraction 1/2, and percentage 50% all represent the same proportion.
Similarly, 0.25 equals 1/4 and 25%, while 0.75 equals 3/4 and 75%.
Recognising common equivalents can make mental percentage calculations faster.
Why Multiplying by 100 Works
A decimal describes a value relative to one whole. A percentage describes a value relative to 100 equal parts.
Multiplying by 100 rescales the decimal from a one-whole basis to a per-hundred basis.
The percentage symbol indicates that the displayed number should be interpreted as parts per hundred.
Common Mistakes
The most common mistake is moving the decimal point only one place instead of two.
Another is adding the percentage symbol without multiplying by 100. The decimal 0.42 equals 42%, not 0.42%.
It is also possible to multiply by 100 correctly but forget the percentage symbol, leaving the result unclear.
Conclusion
To convert a decimal to a percentage, multiply the decimal by 100 and add the percentage symbol.
Move the decimal point two places to the right and round only after the conversion is complete.
Use the Percentage Calculator to check decimal and percentage relationships.
Related percentage guides
FAQs
How do I convert a decimal to a percentage?
Multiply the decimal by 100 and add the percentage symbol.
What is 0.375 as a percentage?
Multiply 0.375 by 100. The result is 37.5%.
What is 0.08 as a percentage?
The decimal 0.08 is equal to 8%.
Can a decimal produce a percentage above 100%?
Yes. A decimal greater than one produces a percentage greater than 100%.
Why do I move the decimal point two places?
Moving the point two places to the right is equivalent to multiplying the decimal by 100.