Force Calculator (F = ma)

It states that the net force on an object equals its mass times its acceleration, written F = m times a. Force and acceleration point in the same direction, and a bigger mass needs a bigger force to reach the same acceleration.

Force is in newtons (N), mass in kilograms (kg) and acceleration in metres per second squared (m/s^2). By definition one newton is the force that accelerates one kilogram at one metre per second squared.

Exactly two of force, mass and acceleration. The third is fully determined by the other two, and the tool solves for whichever one you leave out based on the pair you select.

Pick the pair that matches the numbers you already have. Mass and Acceleration solves for force, Force and Acceleration solves for mass, and Force and Mass solves for acceleration.

Weight is the force of gravity on a mass. Choose Mass and Acceleration, enter the mass, and set acceleration to 9.8 m/s^2 for Earth. A 10 kg object then weighs 98 N.

Acceleration is force divided by mass, and dividing by a mass of zero is undefined. The tool rejects that entry rather than showing an infinite or nonsensical result.

Yes. Decimals like 9.8 are fine, and negative numbers are accepted to represent a force or acceleration acting in the opposite direction along an axis.

Each answer is rounded to nine decimal places, which removes tiny floating-point artefacts while keeping ample precision. Whole-number results like 98 N appear cleanly without trailing zeros.

No. F = m times a uses the net force, so if several forces act you must first add them, keeping direction in mind, and enter that single resultant force.