Weight and Mass Converter
Quick answer: Choose a starting unit and a target unit, then enter a value. Common conversions: 1 kg = 2.204623 lb; 1 kg = 1,000 g; 1 kg = 1,000,000 mg. This converter covers 14 weight and mass units.
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Use the Weight and Mass Converter
Weight and Mass formula and what each symbol means
target = value × (factor of starting unit ÷ factor of target unit), where each factor is the unit value in kg.
| Symbol | Meaning |
|---|---|
| value | The number you want to convert |
| factor | The unit’s size expressed in the base unit (kg) |
Weight and Mass examples
kg to lb
10 kg = 22.04623 lb.
kg to g
10 kg = 10,000 g.
kg to mg
10 kg = 10,000,000 mg.
How to calculate Weight and Mass step by step
- Choose the starting unit and the target unit.
- Enter your value.
- Read the converted value, plus the conversion factor in both directions.
Popular weight and mass conversions
- KG to Grams converter
- KG to MG converter
- KG to Pounds converter
- KG to Ounces converter
- KG to Tonnes converter
- Grams to KG converter
- Grams to MG converter
- Grams to Pounds converter
- Grams to Ounces converter
- Grams to Tonnes converter
- MG to KG converter
- MG to Grams converter
- MG to Pounds converter
- MG to Ounces converter
- MG to Tonnes converter
- Pounds to KG converter
How to read your Weight and Mass result
Strictly, kilograms, grams and pounds measure mass, while weight is a force. In everyday use the two are treated as the same on Earth, and these converters work on mass. The pound is defined as exactly 0.45359237 kg, and the ounce is one sixteenth of a pound.
| UNIT | SYMBOL | EQUALS | VALUE OF 1 KG |
|---|---|---|---|
| Kilogram | kg | 1 kg = 1 kg | 1 kg |
| Gram | g | 1 g = 0.001 kg | 1,000 g |
| Milligram | mg | 1 mg = 0.000001 kg | 1,000,000 mg |
| Microgram | µg | 1 µg = 1×10⁻⁹ kg | 1,000,000,000 µg |
| Tonne (metric ton) | t | 1 t = 1,000 kg | 0.001 t |
| Quintal | q | 1 q = 100 kg | 0.01 q |
| Pound | lb | 1 lb = 0.45359237 kg | 2.204623 lb |
| Ounce | oz | 1 oz = 0.028349523 kg | 35.27396 oz |
| Stone | st | 1 st = 6.3502932 kg | 0.157473 st |
| US ton (short ton) | ton | 1 ton = 907.18474 kg | 0.001102311 ton |
| UK ton (long ton) | long ton | 1 long ton = 1,016.0469 kg | 0.0009842065 long ton |
| Carat | ct | 1 ct = 0.0002 kg | 5,000 ct |
| Grain | gr | 1 gr = 0.00006479891 kg | 15,432.36 gr |
| Slug | slug | 1 slug = 14.593903 kg | 0.06852177 slug |
Common mistakes when calculating Weight and Mass
- Mixing up the US short ton (2,000 lb), the UK long ton (2,240 lb) and the metric tonne (1,000 kg).
- Treating a troy ounce as the same as an avoirdupois ounce: this tool uses the avoirdupois ounce (28.349523125 g).
- Forgetting that a stone is 14 pounds, not 10.
Weight and Mass FAQ
How many pounds are in a kilogram?
1 kilogram is about 2.2046 pounds, because 1 lb is exactly 0.45359237 kg.
What is the difference between mass and weight?
Mass is the amount of matter and is measured in kilograms. Weight is the force of gravity on that mass and is measured in newtons. People say weight and mean mass in daily life.
How many grams are in an ounce?
One avoirdupois ounce is exactly 28.349523125 grams.
What is the base unit for weight and mass?
This converter uses kilogram (kg) as the common base unit: every value is first converted to it and then to the target unit.
How do I convert between two weight and mass units?
Choose the starting and target units, enter the value and read the result. By hand: convert to the base unit with the table, then divide by the target unit factor.
How many pounds are in 1 kilogram?
1 kg = 2.204623 lb.
How many grams are in 1 kilogram?
1 kg = 1,000 g.
How many MG are in 1 kilogram?
1 kg = 1,000,000 mg.
Which weight and mass units does this converter support?
It covers 14 units: kilogram (kg), gram (g), milligram (mg), microgram (µg), tonne (t), quintal (q), pound (lb), ounce (oz), stone (st), US ton (ton), UK ton (long ton), carat (ct), grain (gr), slug (slug).
How accurate is the weight and mass converter?
Results are calculated at full double precision and shown to about 8 significant figures. Round the answer to the precision of your original measurement; a result cannot be more accurate than the number you started with.
More in Weight and Mass converters
- Grams to KG Converter
- Tonnes to Pounds Converter
- Grams to MG Converter
- Tonnes to Ounces Converter
- Grams to Ounces Converter
- Tonnes to MG Converter
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Method, review and disclaimer
Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors, BIPM: the SI base units