Percentage Calculator
Calculate what percent one number is of another, percentage increase or decrease, and reverse percentage calculations.
What is X% of Y?
The SolveBar Percentage Calculator handles every type of percentage problem — from basic 'what is 15% of 200' to percentage change, reverse percentage, and ratio calculations. No more fumbling with a calculator or second-guessing your math.
Types of percentage calculations
Covers five scenarios: finding X% of a number, finding what percentage one number is of another, calculating percentage increase or decrease, finding the original value before a percentage change, and comparing two values as a ratio.
Common uses
Percentages appear everywhere — calculating discounts, figuring out tips, understanding interest rates, tracking fitness goals, and analyzing business metrics like conversion rates or profit margins.
Percentage vs percentage points
If a rate increases from 10% to 15%, it increased by 5 percentage points but by 50% in relative terms. This distinction is especially important in finance and statistics.
Frequently Asked Questions
How do I calculate a percentage increase?
Subtract the original value from the new value, divide by the original, then multiply by 100. Our calculator does this automatically.
What is reverse percentage?
Reverse percentage finds the original amount before a percentage was applied. If a price is $120 after a 20% increase, the original was $100.
Can I use this for tax calculations?
Yes. Enter the pre-tax amount and your tax rate to find the total, or enter the total and rate to find the pre-tax amount.
How do I calculate what percentage one number is of another?
Divide the first number by the second, then multiply by 100. For example, 45 out of 180 = (45 / 180) x 100 = 25%. The calculator handles this in the 'What percent is X of Y' mode.
How do I find the original price before a percentage discount?
Use reverse percentage mode. Enter the discounted price and the discount rate. An item at $85 after a 15% discount had an original price of $100, calculated as $85 / (1 - 0.15).