Percentage Calculator

Use the 'What percentage is X of Y?' calculator. Enter the part (X) and the whole (Y), and the tool instantly shows the percentage. For example, 25 is what percent of 200? Answer: 12.5%. This is useful for grades, discounts, and proportions.

Use the 'What is X% of Y?' calculator. Enter the percentage and the number. For example, what is 15% of 80? Answer: 12. This is used for calculating tips, tax, discount amounts, commissions, and price reductions.

Use the Percentage Change calculator. Enter the original value and the new value. The tool calculates: ((New - Original) / Original) x 100. A positive result is an increase; a negative result is a decrease. Useful for comparing prices, sales growth, weight loss, and more.

Use the reverse percentage calculator. If you know the discounted price and the discount percentage, enter the final price and discount rate to find the original price. For example, a product costs $85 after a 15% discount — what was the original price? Answer: $100.

The percentage difference formula is: |A - B| / ((A + B) / 2) x 100. Enter both values in the Percentage Difference section and the calculator computes the symmetric percentage difference. This is used when neither value is the reference (unlike percentage change which has a defined starting point).

Use the 'Add percentage to a number' calculator. Enter the base number and the percentage to add. For example, adding 18% GST to a price of Rs.500: Result = 500 + (500 x 0.18) = Rs.590. This is useful for calculating taxes, markups, and price increases.

The calculator uses JavaScript's double-precision floating-point arithmetic, which is accurate to 15–16 significant digits — more than sufficient for any real-world percentage calculation. Results are rounded to 2–4 decimal places for readability.

Yes. Enter the marks obtained as the part and the total possible marks as the whole in the 'What percent is X of Y?' section. For example, scoring 72 out of 90 gives (72/90) x 100 = 80%. You can also calculate the marks needed to achieve a target percentage.

Yes. The Percentage Calculator is fully mobile-responsive. All calculation modes are accessible on smartphone or tablet browsers with large, touch-friendly input fields and instant results.

Yes, completely free. No sign-up, no ads blocking results, and unlimited calculations. Use it as many times as you need.