How it works
A walkthrough, end to end.
- 1
Enter mass in kg or lb.
- 2
Pick a planet (or enter custom g).
- 3
See weight in newtons, kilogram-force, and pound-force.
Reference
Weight
F = m × g. Earth g = 9.81 m/s². 1 kgf = 9.81 N. 1 lbf = 4.448 N.
Use cases
What you can do with this.
Weight on other planets
Find your Mars weight or Moon weight.
Engineering
Convert mass to load force.
Physics homework
Verify F = m g calculations.
Shipping load
Compute force on a structure or floor.
Aerospace
Estimate launch weight of a satellite.
FAQ
Frequently asked.
Mass is amount of matter (kg). Weight is the force gravity exerts on it (N or lbf).
Often used interchangeably on Earth, but technically 1 lbm × 9.81 m/s² = 4.448 N = 1 lbf.
No. All math runs in your browser.
Enter any g value to compute weight on hypothetical bodies.