Force Calculator (F=ma)

Newton's second law: enter any two of force, mass and acceleration to compute the third.

Your files stay on this device

Files are processed in your browser, never uploaded. The site downloads code and assets to run the tools. No accounts or trackers.

Use Download to save this tool as one HTML file for offline use.

Enter any two values and the third is calculated automatically.

Force

Mass

Acceleration

About this tool

Apply Newton's second law F = m·a by entering any two of force, mass and acceleration; the third is computed live in your browser.

What are the units?

Force is in newtons (N), mass in kilograms (kg) and acceleration in metres per second squared (m/s²), the standard SI units of F = m·a.

How do I find weight?

Set the acceleration to 9.81 m/s² (Earth's gravity) and enter the mass — the resulting force is the object's weight in newtons.