Find what X% of Y is, what percent one number is of another, or calculate a percentage increase or decrease — instantly.
Percentage problems come up everywhere — discounts, grades, tips, taxes, salary changes, business growth. This calculator covers the three most common types:
A positive result in the increase/decrease mode means the value went up; a negative result means it went down.
Divide the percentage by 100, then multiply by the number. For example, 20% of 150 is (20 / 100) × 150 = 30.
Divide the part by the whole, then multiply by 100. For example, to find what percent 45 is of 180: (45 / 180) × 100 = 25%.
Subtract the old value from the new value, divide by the old value, then multiply by 100. A positive result is a percentage increase; a negative result is a percentage decrease.
Percentage points measure the simple difference between two percentages (e.g., 15% minus 10% is 5 percentage points). Percentage change measures that difference relative to the original value (a move from 10% to 15% is a 50% relative increase).
Yes. When calculating percentage change, a negative result simply indicates a decrease rather than an increase — the size of the number still tells you the magnitude of the change.