The Percentage Calculator handles every common percentage problem in seconds: find a percentage of a number, calculate the percentage change between two values, or determine what percentage one number is of another. All three calculation types are available without switching between different tools.

Percentages come up constantly in daily life — at the restaurant when calculating a tip, at the store comparing sale prices, on a report card converting a score to a grade, in a business meeting discussing revenue growth, or on a tax form computing a rate on income. The math is simple in principle but surprisingly easy to confuse in practice, especially when working backward (finding the original price from a sale price and a discount) or computing compound changes.

Finding a percentage of a number is the most common operation: what is 18% of $67.40 for a tip? Enter 67.40 and 18 and the answer is $12.13. What is 7.5% sales tax on a $299 purchase? Enter 299 and 7.5 and you get $22.43.

Percentage change is equally important: if a stock went from $142 to $178, what was the percentage gain? The calculator handles this instantly — the answer is 25.35%. If revenue fell from $2.4M to $1.9M, what was the percentage decline? Enter both figures and the tool returns -20.83%.

Finding what percentage one number is of another is the third mode: a student scored 67 out of 80 — what percentage is that? The answer is 83.75%. A project used 3,400 of a 12,000-unit budget — what portion is that? The answer is 28.33%.

All calculations run in your browser with no data transmitted. Free, instant, and available on any device without signup.