Percentage Calculator
Four calculators in one — answers appear as you type.
Covers discounts, tips, tax, marks, interest and growth — pick the mode that matches how the question is phrased.
One percentage calculator for every real situation: find X% of a number (tax, tips), what percent X is of Y (marks, shares), percentage change between two values (growth, price rises), and increase-or-decrease by a percent (discounts, raises). Answers update live as you type, with the working shown so you can trust the number.
How to use it
- Pick the mode that matches your question's phrasing.
- Enter the two numbers — the answer appears instantly with the calculation spelled out.
- Switch modes freely; your numbers stay put.
Frequently asked questions
How do I calculate a percentage discount?
Use “Increase / decrease”: enter the price and the discount percent — the decreased value is your sale price. A 20% discount on 1,500 shows 1,200 instantly.
How do I find what percent one number is of another?
Use “X is what % of Y”: scoring 42 out of 60 → 42 is 70% of 60.
How is percentage change calculated?
(New − Old) ÷ Old × 100. Going from 80 to 100 is a +25% change; going from 100 to 80 is −20% — direction matters, which trips everyone up.
Why do I get a different answer reversing a percentage?
Because the base changes: +25% then −25% does not return you to the start. Always compute against the correct original value.
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