Percentage Calculator
Work out percentages both ways: a percentage of a number, what percent one number is of another, the change between two values and the total behind a known part. Every answer shows the formula it came from.
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Answer
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Common fractions as percentages
| Fraction | Percentage |
|---|---|
| 1/2 | 50% |
| 1/3 | 33.3333% |
| 1/4 | 25% |
| 1/5 | 20% |
| 2/3 | 66.6667% |
| 3/4 | 75% |
| 1/8 | 12.5% |
| 1/10 | 10% |
What is a percentage?
A percentage is a fraction whose denominator is always 100: 25% means 25 out of 100, or 0.25 as a decimal. Because the denominator never changes, percentages make it easy to compare numbers of different sizes — 30 out of 150 and 3 out of 15 are both 20%.
Every percentage question comes down to the same three values: a part, a whole and a rate. Give any two and the third follows, which is why picking the right mode matters more than the arithmetic.
How to calculate a percentage
- Pick the question you are actually asking: X% of Y, what percent X is of Y, the change between two numbers, or the total behind a known part.
- Type the two numbers you have. The labels change with the mode, so From and To mean exactly what they say.
- The result updates as you type and the Calculate button confirms it; the panel shows both the number and the arithmetic behind it.
- Use the copy button to take the value away, or switch modes without retyping to look at the same numbers from another angle.
Percentage examples
Percent of a number
20% of 150
30
One number as a percent of another
30 is what percent of 150
20%
Percentage change
from 80 to 100
+25% (increase)
UrsaKit vs other percentage calculators
| Dimension | UrsaKit | percentagecalculator.net | calculator.net | omnicalculator |
|---|---|---|---|---|
| Price | Free | Free with ads | Free with ads | Free with ads |
| Calculates as you type | Yes | Yes | No | Yes |
| Shows the formula | Yes | No | No | Partial |
| Keeps values when switching modes | Yes | No | No | Partial |
| Uploads anything | No | No | No | No |
Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100, or move the decimal point two places: 20% of 150 is 150 × 0.2 = 30.
How do I find what percent one number is of another?
Divide the part by the whole and multiply by 100: 30 of 150 is 30 ÷ 150 × 100 = 20%.
What is the percentage increase formula?
Subtract the starting value from the final value, divide by the starting value and multiply by 100: (100 − 80) ÷ 80 × 100 = +25%. The same formula returns a negative number for a decrease.
Should I divide by the old value or the new one?
The starting value, also called the base or the old value. Dividing by the new value gives a smaller answer: going from 80 to 100 is a 25% increase, not 20%.
What is the difference between percent and percentage points?
A move from 10% to 12% is a 2 percentage point rise but a 20% increase, because the change is measured against the original 10%.
Is anything uploaded?
No. Every calculation runs in your browser and nothing is sent to a server.