Quickly calculate percentages, percentage of a value, and percentage change, free and instant.
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The Percentage Calculator handles the four most common percentage problems in one place: finding what X% of Y is, finding what percentage one number is of another, and calculating percentage increase or decrease between two values — the kind of maths that shows up constantly in shopping discounts, exam marks, salary hikes and business margins.
Percentage increase is calculated as (new value − old value) ÷ old value × 100, while percentage decrease uses the same formula with a negative result; getting the base value right is the most common source of error, which is why each mode is presented separately here to avoid mixing up what is being compared against what.
Percentage increase is relative (e.g., interest rate rising from 5% to 6% is a 20% increase), while percentage points measure the raw difference (a 1 percentage point rise). Confusing the two is a common mistake in finance and exam reporting.
Divide the discounted price by (1 − discount%). For example, if a price of ₹800 is after a 20% discount, the original price is 800 ÷ 0.8 = ₹1,000. Use the 'percentage of a number' mode in reverse to check this.
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Yes — it works on any modern browser (desktop, Android or iOS) without installing an app, and it's free to use with no signup or watermark.
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