Percentage Calculator
Percent of, ratio and percent changeRuns locally · nothing uploaded
What is% of?
30
is what % of?
25%
Change fromto?
+25% increase
Also works as:percent of a numberwhat percentpercent change
How it works
When to use it
- Find X% of a number (tips, tax, commission).
- Find what percent one number is of another.
- Find the percentage change between two values.
Formula
A% of B = A ÷ 100 × BA as a % of B = A ÷ B × 100%Change = (new − old) ÷ |old| × 100%Worked example
Given: 20% of 350; 45 out of 60; 80 → 100
- 0.2 × 350 = 70.
- 45 ÷ 60 = 75%.
- (100 − 80) ÷ 80 = +25%.
Result: 70; 75%; up 25%.
Reading the result
- Percentage change depends on the starting value: 80 → 100 is +25%, but 100 → 80 is −20%.
- A move from 3% to 4% is 1 percentage point, or a 33.3% increase.
Limitations
- Percentage change is undefined when the old value is 0.
How to use
- 1Find the row for your question: percent of a number, percent ratio, or percentage change.
- 2Enter the numbers in that row.
- 3The result appears instantly on the right.
FAQ
How do I calculate a percentage?
Percentage = part ÷ whole × 100. For example, 30 out of 120 is 30 ÷ 120 × 100 = 25%.
How is percentage change calculated?
Percentage change = (new − old) ÷ old × 100. A positive result is an increase, a negative one a decrease. It is undefined when the old value is 0.
Is my data sent anywhere?
No. Every calculation runs in your browser.
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