Weight Converter
Weight Converter translates kg, g, mg, lb, and oz through kilogram-based factors. In everyday language the page says weight, but the numeric units here represent mass; force under gravity would require newtons and a gravitational model. Pound and ounce mean the common avoirdupois units.
Runs locally — files stay on your deviceHow many kilograms are in one pound?
Exactly 0.45359237 kilograms for the international avoirdupois pound.
Mass is independent of local gravitational acceleration
Kilogram is the SI mass unit. This converter uses 1 lb = 0.45359237 kg and 1 oz = 0.028349523 kg, with metric decimal factors for grams and milligrams.
How it works
The source mass is converted to kilograms and then divided by the destination factor. Selected precision controls only the displayed result.
Key concepts
Mass and force differ
Weight force depends on gravity; kg and lb here are treated as mass units.
Ounce is ambiguous by context
This page supports avoirdupois mass ounce, not fluid or troy ounce.
When to use it
- Translate package mass.
- Compare recipe or product labels.
- Convert pounds to kilograms for a general calculation.
When not to use it
- Do not use it for force in newtons.
- Do not assume the ounce is a fluid ounce.
- Do not use avoirdupois ounces for troy-metal measurements.
Worked examples
Pounds to kilograms
- Input
10 lb- Expected output
4.5359237 kg
The exact pound factor is applied.
Kilograms to grams
- Input
2.5 kg- Expected output
2500 g
Kilo denotes a factor of one thousand.
Ounces to pounds
- Input
16 oz- Expected output
About 1 lb
Rounding reflects the stored ounce factor.
Common mistakes
Using fluid ounces
Fluid ounce measures volume. Correction: Use Volume Converter.
Mixing troy and avoirdupois
Precious-metal ounces have a different mass. Correction: Use a troy-specific tool.
Calling kg a force
The SI force unit is the newton. Correction: Specify mass unless gravity is part of the problem.
Best practices
- State the ounce and pound system.
- Keep mass and force terminology distinct.
- Round according to scale accuracy.
Related operations and differences
Area Converter
Choose Area Converter when you need to convert common metric and imperial areas.; use Weight Converter specifically for convert.
Length Converter
Choose Length Converter when you need to convert metric and imperial length units.; use Weight Converter specifically for convert.
Data Storage Converter
Choose Data Storage Converter when you need to convert decimal and binary storage units.; use Weight Converter specifically for convert.
Energy Converter
Choose Energy Converter when you need to convert joules, calories and watt-hours.; use Weight Converter specifically for convert.
Fuel Economy Converter
Choose Fuel Economy Converter when you need to convert MPG, L/100 km and km/L.; use Weight Converter specifically for convert.
Power Converter
Choose Power Converter when you need to convert watts, kilowatts and horsepower.; use Weight Converter specifically for convert.
Limitations and privacy
- Avoirdupois units only.
- No stones, tonnes, troy units, or force conversion.
- Rounded floating-point output does not model uncertainty.
Values are converted locally in this browser and are not uploaded.
Frequently asked questions
Does oz mean fluid ounce?
No.
Is pound-to-kilogram exact?
The international pound is exactly 0.45359237 kg.
Are kg and lb mass or force here?
Mass.
Does it support troy ounces?
No.