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Force Calculator

Force is calculated as mass times acceleration according to Newton's second law. The unit is the newton (N), representing the force needed to accelerate an object.

Enter the mass (kg) and acceleration (m/s²) to instantly get the required force (N). Useful for analyzing motion or estimating forces in mechanical design.

For example, accelerating a 10 kg object at 5 m/s² requires a force of 50 N.

Force Calculator

Force Calculator Calculation Method

F = m a
F: force (N), m: mass (kg), a: acceleration (m/s²)
The force (N) is 0 .

About This Calculator

Force is a push or pull that changes an object's motion, measured in newtons (N). Newton's second law says the force needed to accelerate a mass is proportional to both the mass and the acceleration.

Enter the mass and acceleration to find the required force in newtons.

Force equals mass times acceleration, so accelerating a 1,200 kg car from rest to 100 km/h in 10 seconds needs about 3,333 N before friction and drag. A 70 kg person standing still pushes down with 687 N at 9.81 m/s². Doubling the force doubles the acceleration only while the mass stays fixed.

Key Formula:F = m × a (1 N = 1 kg·m/s²)

Frequently Asked Questions

What is Newton's second law of motion?

It states that the net force on an object equals its mass times its acceleration: F = ma. Push a heavier object with the same force and it accelerates less; push harder and it accelerates more.

How much force does gravity exert on a person?

Weight is the gravitational force on a mass: someone of 70 kg experiences 70 × 9.8 ≈ 686 N of force toward the Earth. In space, where g is negligible, the same person's mass is unchanged but weight is near zero.

What is the difference between mass and weight?

Mass in kilograms measures inertia and does not change with location. Weight is the gravitational force, mass times local gravity, so a 70 kg person weighs 687 N on Earth but only 114 N on the Moon.

Does a moving object need a force to keep moving?

Not in the absence of friction: Newton first law says constant velocity requires zero net force. In everyday life friction and air resistance act continuously, so a force is needed just to maintain motion against them.

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Sources & last update

2026-10-19