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.
Frequently asked questions
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.