Percentage Calculator
Free CalculatorEnter a value and a percentage to see X% of the value, plus the value increased and decreased by that percentage β in seconds, privately.
100% private
Runs in your browser β no numbers leave your device.
Your numbers
The base number you want to take a percentage of.
The percentage to apply β enter 20 for 20%.
X% of Y
30
Value multiplied by the percentage divided by 100 β the percentage amount itself.
Value + X%
230
The value after adding the percentage β useful for mark-ups, tips and price rises.
Value β X%
170
The value after subtracting the percentage β useful for discounts and drops.
How it works
Enter a value
Type the base number you want to work from.
Enter a percentage
Add the percentage you want to apply to that value.
Read the results
X% of the value, the increase and the decrease update live as you type.
Try new numbers
Change either field to compare discounts, mark-ups and shares instantly.
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How do you use a percentage calculator?
A percentage calculator answers the everyday question "what is X% of Y?" by multiplying the value by the percentage and dividing by 100. So 20% of 150 is 150 Γ 20 Γ· 100 = 30. That single formula covers tips, taxes, commissions, test scores and any share of a whole β type the value and the percentage and the amount appears instantly.
The same tool also handles percentage increase and percentage decrease, which is where most people get stuck. A percentage increase adds the percentage amount back on top of the value: 150 increased by 20% is 150 + 30 = 180. A percentage decrease subtracts it: 150 decreased by 20% is 150 β 30 = 120. That makes this percentage calculator handy for discounts, price rises, mark-ups and growth β you see the base amount, the increase and the decrease side by side.