What is Newton's second law?

Newton's second law states that the net force on an object equals its mass times its acceleration, written F = m × a. A net force of one newton accelerates one kilogram at one metre per second squared.

What units should I use?

Use SI units for a result in newtons — mass in kilograms and acceleration in metres per second squared. If you enter mass in grams, divide your answer by 1000 to convert.

Is my data sent anywhere?

No. Every calculation runs locally in your browser and nothing is uploaded.

Force Calculator (F = ma)

Newton's second law — solve for force, mass, or acceleration.

Force calculator — Newton’s second law

This tool applies Newton’s second law, F = m × a, and rearranges it so you can solve for force, mass, or acceleration depending on what you already know.

Pick the unknown, enter the other two values in SI units, and the answer updates instantly — entirely in your browser.