How do I calculate X percent of Y?

Divide X by 100 and multiply by Y.

How do I calculate percent change?

Subtract the old value from the new value, divide by the old value, and multiply by 100.

Sale price equals the original price minus original price times discount percent divided by 100.

Find X% of Y, what percent one number is of another, percent change, and sale discounts. Free, instant, private.

Percentage (X %)

Value (Y)

X% of Y = (X ÷ 100) × Y

Quickly calculate your exam percentage and predict your grade. Ideal for students, teachers, and parents.

Calculate your Body Mass Index (BMI) instantly with metric or imperial units. See your category and healthy weight range.

Standard arithmetic, scientific functions with degrees/radians, plus GCD, LCM, prime check, factorial, and quadratic solver.

Calculate your Body Mass Index (BMI) instantly with metric or imperial units. See your category and healthy weight range.

Calculate your exact age in years, months, days, and discover interesting details like your total days lived and time until your next birthday.