Percentage Calculator
What is a Percentage Calculator?
Percentages appear everywhere - sales, taxes, grades, tips, statistics and financial returns. A percentage calculator handles the three most common percentage problems instantly: finding a percentage of a number, finding what percent one number is of another, and calculating percentage change between two values.
Pick the calculation you need, enter the two numbers, and the result appears immediately. Each mode also explains the math behind the answer, so you learn the method while you get the result.
Frequently Asked Questions
How do I calculate a percentage of a number?
Multiply the number by the percentage divided by 100. For 15% of 200: 200 × 15/100 = 30. You can think of it as 0.15 × 200.
How do I calculate what percent one number is of another?
Divide the first number by the second and multiply by 100. For example, 30 out of 200 is 30 ÷ 200 × 100 = 15%. This is how you figure out test scores and completion rates.
How do I calculate percentage change?
Subtract the old value from the new value, divide by the old value, and multiply by 100. If a price rises from $50 to $60: (60 - 50) ÷ 50 × 100 = 20% increase. Negative results mean a decrease.
What is the difference between percentage and percentage points?
A percentage point is the simple arithmetic difference between two percentages. If an interest rate rises from 5% to 6%, that is a 1 percentage point increase, but a 20% increase relative to the starting rate. Context matters when reading statistics.