What does this tool do?
Percentage Calculator solves everyday percentage questions in seconds: what is X% of a number, what percent one value is of another, and the percentage increase or decrease between two values. It is handy for discounts, tax, tips and grades.
How to use it
- Enter your values into the fields.
- The result is calculated instantly.
- Read or copy the result.
Common percentage calculations
Discount: 25% of $200 = $50 off, so you pay $150. Increase: from 80 to 100 = a 25% increase. Ratio: 30 is 25% of 120. This tool solves all three question types in separate fields, so you never have to remember the formula.
Frequently asked questions
How do I calculate a percentage increase?
Percent change = ((new value − old value) / old value) × 100. For example, from 80 to 100: ((100 − 80) / 80) × 100 = a 25% increase.
How do I find a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 20% of 250: (250 × 20) / 100 = 50.
Is Percentage Calculator free?
Yes. Percentage Calculator and all 300+ tools on MagmaNex are completely free with no signup or account required.
Is my data safe?
Yes. Everything runs locally in your browser. The data you enter is never sent to a server, stored, or shared.
Does it work on mobile?
Yes. Percentage Calculator works on phones, tablets and desktops — no app download needed.
🔒 Privacy: everything runs in your browser, your data is never sent to a server.