Pick what you want to work out below.
Divide the first number by the second, then multiply by 100. For example, to find what percent 30 is of 120, divide 30 by 120 to get 0.25, then multiply by 100 to get 25%.
Multiply the number by the percentage, then divide by 100. For example, 20% of 250 is (250 × 20) ÷ 100, which equals 50.
Subtract the original value from the new value, divide that by the original value, then multiply by 100. A positive result means an increase, and a negative result means a decrease.
Yes, you can enter decimal numbers into either field and the calculator will handle them correctly.