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Force Calculator

Part of: Physics →

Calculate Force (F = m × a)

Newton's Second Law. Enter mass in kg and acceleration in m/s² to get force in Newtons.

Result will appear here

How to Use the Force Calculator

  1. Select the physical quantity you want to calculate.
  2. Enter all required known values with their units.
  3. Click Calculate to solve for the unknown.
  4. Review the formula and assumptions shown alongside the result.

Force Calculator – Easily Calculate Force Using Newton's Second Law

Force is one of the most fundamental concepts in physics. Whether you're studying Newtonian mechanics, solving engineering problems, or analyzing the dynamics of a system, calculating force accurately is essential.

Newton's Second Law

F = m × a

How to Use

  1. Enter mass in kilograms.
  2. Enter acceleration in m/s².
  3. Click Calculate to get force in Newtons.
  4. Click Copy Result to copy the output.

Example Calculations

m = 5 kg, a = 3 m/s² → F = 5 × 3 = 15 N

m = 70 kg, g = 9.81 m/s² → F = 70 × 9.81 = 686.7 N (weight on Earth)

m = 70 kg, g = 3.72 m/s² → F = 70 × 3.72 = 260.4 N (weight on Mars)

Other Force Formulas (Reference)

Applications

Frequently Asked Questions

What is the unit of force?

The newton (N). 1 N = 1 kg·m/s².

Can I calculate weight using this?

Yes — enter mass (kg) and gravitational acceleration (9.81 for Earth) to get weight in Newtons.

What gravity value should I use for Mars?

3.72 m/s².

Is force a scalar or vector?

Force is a vector — it has both magnitude and direction. This calculator returns the magnitude.

How do I find mass from force?

Rearrange: m = F / a. Divide the force by the acceleration.

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