％ Percentage Calculator

Percentage calculator online free — find X% of a number, what percent X is of Y, and percentage increase or decrease between two values. Instant answers with the formula shown.

🔒 100% Private — no uploads ⚡ Instant — works offline 💸 Free forever — no sign-up

1 — What is X% of Y?

% of = —

2 — X is what percent of Y?

is = —

3 — Percentage change from X to Y

From to = —

How to use the Percentage Calculator

1 Pick the calculation you need — % of a number, "X is what % of Y", or percent change.
2 Enter the two values.
3 The answer and the formula used appear instantly.

Frequently asked questions

How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. Example: 15% of 2,400 = 2400 × 15 ÷ 100 = 360. The first calculator does this for you.

How do I find what percent one number is of another?

Divide the part by the whole and multiply by 100. Example: 45 of 180 → 45 ÷ 180 × 100 = 25%.

How is percentage increase calculated?

(New − Old) ÷ Old × 100. Example: price rising from ₹80 to ₹100 is a 25% increase; falling from ₹100 to ₹80 is a 20% decrease.

How do I calculate exam marks percentage?

Use the second calculator: your marks are X, the total is Y. Scoring 432 of 500 → 86.4%.