Weight Calculator
Instantly convert kg to lbs, grams to ounces, stones to pounds and more. Calculate your weight on the Moon, Mars, or Jupiter with accurate step-by-step solutions.
Your Input
Select a conversion type, enter your weight or mass value, then click Convert or Calculate to get instant results with a detailed step-by-step solution.
Complete User Guide
What is Weight? Understanding Weight vs Mass
Weight is the gravitational force exerted on an object. When you step on a scale and see kilograms or pounds, you are measuring how strongly gravity pulls on your body. Unlike mass — which is the actual amount of matter and stays the same everywhere — your weight changes depending on your location. For example, you would weigh about one-sixth on the Moon compared to Earth because the Moon's gravity is weaker.
Weight = Mass × Gravity (W = m × g)
Use our weight calculator above to convert between kilograms and pounds, find out how much you would weigh on Mars or Jupiter, or calculate mass from weight using the physics formula. All results include detailed step-by-step solutions.
How to Convert Weight: 4 Calculation Modes
Convert Weight Units (kg to lbs, grams to ounces, etc.)
Need to convert kg to lbs or grams to ounces? Enter any weight value and select from/to units. Instantly get the converted result plus a complete reference table showing your weight in all 9 supported units.
Calculate Weight from Mass (W = m × g)
Enter mass in kg, grams, or pounds and specify gravitational acceleration (9.80665 m/s² for Earth) to calculate weight force in Newtons, pound-force, or kilogram-force. Perfect for physics homework and engineering problems.
Calculate Mass from Weight (m = W / g)
Know the weight force but need the mass? Enter weight in Newtons, pound-force, or kilogram-force with gravity to calculate mass. Uses the inverse formula m = W / g.
How Much Would I Weigh on Mars, Moon, or Jupiter?
Enter your Earth weight in kg or lbs and select any planet, the Moon, or the Sun. See exactly how much you would weigh there. Compare your weight across all 10 celestial bodies at once with interactive charts.
How to Use This Weight Converter
- Select your calculation type: weight converter, mass to weight, weight to mass, or weight on planets
- Enter the weight or mass value you want to convert
- Choose the source and target units (kg, lbs, grams, ounces, stones, etc.)
- Click 'Convert' or 'Calculate' to get your instant result
- Review the detailed step-by-step solution and comparison charts
- Use the all-conversions table to see your weight in every supported unit at once
- Click 'Reset' to clear all inputs and start a new conversion
Weight Units Conversion Table: Kg, Lbs, Grams, Ounces & More
| Unit | Symbol | Equivalent in kg |
|---|---|---|
| Kilogram | kg | 1 |
| Gram | g | 0.001 |
| Milligram | mg | 0.000001 |
| Pound | lb | 0.453592 |
| Ounce | oz | 0.028350 |
| Stone | st | 6.350293 |
| Metric Ton | t | 1000 |
| US Ton | ton | 907.185 |
| Carat | ct | 0.0002 |
Gravity on Each Planet: How Much Would You Weigh?
| Planet | Gravity (m/s²) | Relative to Earth |
|---|---|---|
| Earth | 9.807 | 1.00× |
| Moon | 1.625 | 0.17× |
| Mercury | 3.700 | 0.38× |
| Venus | 8.870 | 0.90× |
| Mars | 3.711 | 0.38× |
| Jupiter | 24.790 | 2.53× |
| Saturn | 10.440 | 1.06× |
| Uranus | 8.870 | 0.90× |
| Neptune | 11.150 | 1.14× |
| Sun | 274.000 | 27.94× |
Mass vs Weight: What's the Difference?
Many people use "mass" and "weight" interchangeably, but they are fundamentally different in physics. Understanding this difference is essential for accurate weight conversions and scientific calculations.
Mass (Constant)
- Amount of matter in an object
- Measured in kilograms (kg), grams (g), pounds (lb)
- Stays the same on Earth, Moon, Mars, or in space
- Scalar quantity — has magnitude only
Weight (Variable)
- Gravitational force pulling on an object
- Measured in Newtons (N), pound-force (lbf)
- Changes depending on gravity — less on Moon, more on Jupiter
- Vector quantity — has magnitude and direction
Important Notes About Weight Conversion
- 1 kilogram equals 2.20462 pounds. 1 pound equals 0.453592 kilograms. These are the most commonly used weight conversions worldwide.
- Your weight on the Moon is about 16.6% of your Earth weight. On Jupiter, you would weigh about 2.53 times more than on Earth.
- In everyday conversation, 'weight' usually means mass (kg/lbs). In physics, weight is a force measured in Newtons (N). This calculator handles both uses accurately.
- All conversions use SymPy for high-precision symbolic calculations verified with NumPy, ensuring scientifically accurate results every time.
- Standard Earth gravity is 9.80665 m/s². This value is used as the reference for all planetary weight comparisons.
Common Weight Conversions
Here are the most frequently searched weight conversions. Use our calculator above to convert any value instantly with full precision.
1 kg = 2.20462 lbs
Kilograms to Pounds
1 lb = 453.592 g
Pounds to Grams
1 oz = 28.3495 g
Ounces to Grams
1 stone = 6.35029 kg
Stones to Kilograms
1 stone = 14 lbs
Stones to Pounds
1 metric ton = 1000 kg
Metric Tons to Kilograms