Free Online Calculators

Calculates the average annual population growth rate as a percentage based on initial population, final population, and number of years.

Calculate percentages, percentage increase, decrease, and find what percentage one number is of another.

Calculate how many times the air in a room is replaced per hour based on airflow and room dimensions.

Calculate a company's EBITDA margin as a percentage of total revenue.

Calculate your target heart rate for exercise using the Karvonen formula based on maximum heart rate, resting heart rate, and exercise intensity.

Calculate kinetic energy from mass and velocity using KE=½mv². Perfect for physics and mechanics.