Percentage Calculator
Percentages, increases, decreases, and shares — solved.
Runs 100% in your browser — nothing is uploaded
A fast, all-in-one percentage calculator: find X% of a number, work out what percentage one number is of another, calculate percentage increase or decrease, and add or subtract a percentage. Clear, step-by-step answers, right in your browser.
Frequently asked questions
What can this calculator do?
Four common jobs: X% of a number, 'A is what percent of B', percentage increase/decrease between two numbers, and adding or subtracting a percentage from a value.
Does it show how the answer is worked out?
Yes. Each mode shows the formula and the numbers plugged in, so you can check the result and learn the method.
Is it good for discounts and tips?
Absolutely — use 'add/subtract a percentage' for tax, tips, and markups, and the increase/decrease mode for sale prices and changes over time.
Is anything uploaded?
No. All the maths runs locally in your browser; nothing is sent anywhere.
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