Formula
Decimal to percent = decimal × 100. Move the decimal point two places to the right and append the % symbol. Example: 0.75 × 100 = 75%.
How to use this calculator
Enter any decimal value. The percentage appears instantly along with a one-step breakdown. The calculator works for any real number: positive, negative, less than 1, or greater than 1.
Formula
A percentage is a decimal scaled to a "per hundred" basis. The conversion is a single multiplication:
$$\% = \text{Decimal} \times 100$$
The operation moves the decimal point two places to the right: 0.75 becomes 75, and 0.03 becomes 3. The "%" symbol is then appended to indicate that the value is expressed per hundred.
The reverse is equally simple: divide by 100 (or move the decimal point two places to the left) to convert a percentage back to a decimal.
Worked examples
Example 1: standard decimal — 0.75
$$0.75 \times 100 = 75\%$$
0.75 is equal to 75%.
Example 2: repeating decimal — 1/3
The decimal 0.333… (one-third) converts to a repeating percentage:
$$0.333\ldots \times 100 = 33.333\ldots\%$$
0.333… is equal to 33.333…% — a non-terminating repeating percentage.
Example 3: decimal greater than 1
Any decimal above 1 gives a percentage above 100%:
$$1.5 \times 100 = 150\%$$
1.5 is equal to 150% — representing a value 50% more than a whole.
Decimal to percent reference table
| Decimal | Percentage | Common meaning |
|---|---|---|
| 0.001 | 0.1% | One tenth of one percent |
| 0.01 | 1% | One percent |
| 0.05 | 5% | One twentieth |
| 0.1 | 10% | One tenth |
| 0.125 | 12.5% | One eighth |
| 0.2 | 20% | One fifth |
| 0.25 | 25% | One quarter |
| 0.333… | 33.333…% | One third |
| 0.5 | 50% | One half |
| 0.666… | 66.666…% | Two thirds |
| 0.75 | 75% | Three quarters |
| 1.0 | 100% | One whole |
| 1.5 | 150% | One and a half |
| 2.0 | 200% | Double |
Reverse: percent to decimal
To convert a percentage back to a decimal, divide by 100:
$$\text{Decimal} = \frac{\%}{100}$$
Example: 37.5% as a decimal:
$$\frac{37.5}{100} = 0.375$$
Equivalently, move the decimal point two places to the left: 37.5 → 0.375.
Common mistakes
Confusing the decimal with the percentage
Writing 0.75% instead of 75% is a 100× error. 0.75% means "75 hundredths of one percent" — a very small quantity. This mistake is common when copying values from spreadsheets where cells may be formatted as percentages (showing 75%) but storing the decimal (0.75).
Not moving the decimal point far enough
Multiplying by 10 instead of 100 is a common slip. The conversion always requires two decimal places of movement: 0.45 × 100 = 45%, not 4.5%.
Forgetting that values above 1 are valid
Decimals greater than 1 are legitimate inputs. 1.07 = 107%, which might represent a 7% growth factor, a tax-inclusive price multiplier, or any quantity that exceeds a reference value by 7%.
Frequently asked questions
How do you convert a decimal to a percentage?
Multiply by 100 (or move the decimal point two places to the right). Example: 0.75 × 100 = 75%.
What is 0.5 as a percentage?
50%. Calculation: 0.5 × 100 = 50%.
What is 0.25 as a percentage?
25%. Calculation: 0.25 × 100 = 25%.
Can a decimal give a percentage greater than 100%?
Yes. Any decimal above 1 converts to a percentage above 100%. For example, 1.5 × 100 = 150%.
How do you convert a percentage back to a decimal?
Divide by 100 (or move the decimal point two places to the left). Example: 37.5% ÷ 100 = 0.375.
What is the difference between a decimal and a percentage?
They represent the same value in different forms. A percentage is a decimal multiplied by 100, expressing the quantity per hundred. 0.75 and 75% are identical — just written differently.