Weight Calculator
Convert weight units, calculate weight from mass, and find your weight on different planets.
Your Input
Choose a calculation type, enter your values, then click the button to see results and step-by-step solution.
Complete User Guide
What is Weight?
Weight is the force exerted on an object due to gravity. It depends on both the object's mass and the gravitational acceleration. Weight = Mass × Gravity.
Calculation Types
Convert Weight Units
Enter a weight value and choose from/to units (kg, g, lb, oz, stone, ton, etc.) to get the converted value.
Calculate Weight from Mass
Enter mass and gravity (e.g. 9.80665 m/s² for Earth). Result is force in Newtons or in lb/kg-force.
Calculate Mass from Weight
Enter weight (force) and gravity to get mass in kg, g, lb, or oz.
Weight on Planets
Enter your weight on Earth and select a planet (or Moon/Sun) to see your weight there. Your mass stays the same; only gravity changes.
How to Use
- Select calculation type from the dropdown
- Enter the required values in the form
- Click the action button (Convert / Calculate)
- Review results and step-by-step solution on the right
- Use Reset to clear inputs and hide results
Weight Units
Metric: kg, g, mg, t
Imperial: lb, oz, st, ton
Other: ct (carat), N (Newton)
Formulas
Weight from Mass:
W = m × g
Mass from Weight:
m = W / g
Where: W = Weight (N), m = Mass (kg), g = Gravity (m/s²)
Planetary Gravity
Earth: 9.81 m/s²
Moon: 1.62 m/s²
Mars: 3.71 m/s²
Jupiter: 24.79 m/s²
Sun: 274 m/s²
Mass vs Weight
Mass: Amount of matter (constant)
Weight: Force due to gravity (varies)
Your mass is the same everywhere, but your weight changes with gravity.
Important Notes
- Weight depends on gravity
- Mass is constant regardless of location
- Standard Earth gravity: 9.80665 m/s²
- Weight on Moon is about 1/6 of Earth
- Weight on Jupiter is about 2.5× Earth
- Use Newtons for scientific calculations
Common Applications
- Unit conversions
- Physics calculations
- Cooking measurements
- Shipping and logistics
- Fitness and health