Percentage Calculator
Every percentage question, solved.
Runs entirely in your browser — nothing you enter is uploaded, logged, or tracked.
Answer the three everyday percentage questions — X% of Y, X is what % of Y, and the percent change from one number to another — without reaching for a spreadsheet.
What is % of = 16
is what % of = 30%
Percent change from to = +30%
Frequently asked questions
How do I calculate percentage change?
Percent change = (new − old) ÷ old × 100. A positive result is an increase, negative is a decrease — this tool does it for you and labels which.
Is this useful for discounts and tips?
Yes — “what is 20% of 80” gives a discount or tip amount instantly, and the other modes cover test scores, growth rates, and more.