Free percentage calculator — find X% of Y, percentage change, increase, decrease, and what % one number is of another.
X% of Y
X is % of Y
% change
Increase
Decrease
Reverse %
Result
50
25% of 200 is 50.
Formula: 25% × 200
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The QuickToolz Percentage Calculator answers every common percent question instantly: what is X% of Y, what percent is X of Y, percentage increase, percentage decrease, and tip-style markup. Type any two values and the answer appears in real time.
Find a percentage of a number — e.g. 18% of 240
Find what percent one number is of another — e.g. 45 is what % of 300
Percentage increase — original 200, new 260 → +30%
Percentage decrease — original 80, new 60 → -25%
Reverse percentage — back-calculate the original price before a discount or tax
Percentage math is everywhere — sales tax, restaurant tips, exam scores, salary raises, mortgage rates, sale discounts, investment returns. A small misplaced decimal can cost real money. Our percentage calculator double-checks your math instantly and shows the formula used so you can learn the underlying calculation.
Everything you need, nothing you don’t. Built for speed and simplicity.
No submit button — answers update with every keystroke.
Find a percentage of a number, percentage change, or what percent one number is of another.
Each result shows the formula used so you can learn the math.
Everything you need, nothing you don’t. Built for speed and simplicity.
Choose “% of a number”, “% increase”, “% decrease”, or “what % is X of Y”.
Got questions? We’ve got answers. Common questions about Percentage Calculator.
Large inputs and numeric keyboard make it fast on phones.
Type the two values into the input boxes — results update as you type.
Tap copy to grab the percentage answer for your invoice, report, or message.