Percentage Calculator
Find a percentage of a number, work out what percent one number is of another, or calculate percentage change.
Three common percentage questions
This calculator covers the three questions people usually mean by "percentage calculator": finding a percentage of a number, finding what percent one number is of another, and finding the percentage change between two numbers. Pick the mode that matches your question above.
How percentage change is calculated
Percentage change is (new − old) ÷ |old| × 100. A positive result means an increase, a
negative result means a decrease. This is the same formula used for things like tracking a price
change, a salary raise, or year-over-year growth.
Frequently asked questions
How do I calculate a percentage increase?
Use the "% increase / decrease" mode above: enter the original value as "From" and the new value as "To". The result is the percentage change between them — positive for an increase, negative for a decrease.
What's the difference between percentage points and percent?
If a rate moves from 10% to 15%, that's a change of 5 percentage points, but a 50% percentage increase relative to the original 10%. The two describe the same change differently — mixing them up is a common source of confusion in news headlines.
Can a percentage change be negative?
Yes — a negative result in the "% increase / decrease" mode simply means the value went down.
Related tools
Loan & Mortgage Calculator
Work out your monthly payment, total interest, and full amortization schedule.
Compound Interest Calculator
See how your savings or investments grow over time with compound interest and regular contributions.
Currency Converter
Convert between world currencies using live, up-to-date exchange rates.
Tip Calculator
Work out the tip, total bill, and per-person split for any group size.
Savings Goal Calculator
Find out how much to save each month to hit a savings goal by a target date.
ROI Calculator
Calculate return on investment, net profit, and annualized return from an initial and final value.
Discount Calculator
Work out the sale price and total savings for any percentage-off discount.