Popular weight and mass conversions
- Kilograms to grams1 kg = 1,000 g
- Kilograms to milligrams1 kg = 1,000,000 mg
- Kilograms to pounds1 kg = 2.20462 lb
- Kilograms to ounces1 kg = 35.274 oz
- Kilograms to stone1 kg = 0.157473 st
- Kilograms to metric tons1 kg = 0.001 t
- Grams to kilograms1 g = 0.001 kg
- Grams to milligrams1 g = 1,000 mg
- Grams to pounds1 g = 0.00220462 lb
- Grams to ounces1 g = 0.035274 oz
- Grams to stone1 g = 0.000157473 st
- Grams to metric tons1 g = 0.000001 t
- Milligrams to kilograms1 mg = 0.000001 kg
- Milligrams to grams1 mg = 0.001 g
- Milligrams to pounds1 mg = 0.00000220462 lb
- Milligrams to ounces1 mg = 0.000035274 oz
- Milligrams to stone1 mg = 1.57473×10⁻⁷ st
- Milligrams to metric tons1 mg = 1×10⁻⁹ t
- Pounds to kilograms1 lb = 0.453592 kg
- Pounds to grams1 lb = 453.592 g
- Pounds to milligrams1 lb = 453,592 mg
- Pounds to ounces1 lb = 16 oz
- Pounds to stone1 lb = 0.0714286 st
- Pounds to metric tons1 lb = 0.000453592 t
- Ounces to kilograms1 oz = 0.0283495 kg
- Ounces to grams1 oz = 28.3495 g
- Ounces to milligrams1 oz = 28,349.5 mg
- Ounces to pounds1 oz = 0.0625 lb
- Ounces to stone1 oz = 0.00446429 st
- Ounces to metric tons1 oz = 0.0000283495 t
- Stone to kilograms1 st = 6.35029 kg
- Stone to grams1 st = 6,350.29 g
- Stone to milligrams1 st = 6,350,290 mg
- Stone to pounds1 st = 14 lb
- Stone to ounces1 st = 224 oz
- Stone to metric tons1 st = 0.00635029 t
- Metric tons to kilograms1 t = 1,000 kg
- Metric tons to grams1 t = 1,000,000 g
- Metric tons to milligrams1 t = 1,000,000,000 mg
- Metric tons to pounds1 t = 2,204.62 lb
- Metric tons to ounces1 t = 35,274 oz
- Metric tons to stone1 t = 157.473 st
- Troy ounces to grams1 oz t = 31.1035 g
- Grams to troy ounces1 g = 0.0321507 oz t
- Carats to grams1 ct = 0.2 g
- Grams to carats1 g = 5 ct
- US tons to metric tons1 ton = 0.907185 t
- Metric tons to US tons1 t = 1.10231 ton
- Pounds to US tons1 lb = 0.0005 ton
- US tons to pounds1 ton = 2,000 lb
- Micrograms to milligrams1 µg = 0.001 mg
- Milligrams to micrograms1 mg = 1,000 µg
About weight and mass units
Strictly, these units measure mass — the amount of matter — while weight is the force gravity exerts on it. In everyday language the two are used interchangeably, and kitchen and bathroom scales report mass. Since 2019 the kilogram is defined by fixing the Planck constant, and the avoirdupois pound is defined as exactly 0.45359237 kg.
Weight and Mass unit reference
| Unit | Symbol | Value in kg | System |
|---|---|---|---|
| Kilogram | kg | 1 kg | SI |
| Gram | g | 0.001 kg | SI |
| Milligram | mg | 0.000001 kg | SI |
| Microgram | µg | 1×10⁻⁹ kg | SI |
| Metric ton (tonne) | t | 1,000 kg | Metric |
| Pound | lb | 0.45359237 kg | US customary |
| Ounce | oz | 0.028349523 kg | US customary |
| Stone | st | 6.3502932 kg | Imperial |
| US ton (short ton) | ton | 907.18474 kg | US customary |
| Imperial ton (long ton) | LT | 1,016.0469 kg | Imperial |
| Grain | gr | 0.00006479891 kg | US customary |
| Carat | ct | 0.0002 kg | Metric |
| Troy ounce | oz t | 0.031103477 kg | Other |
| Troy pound | lb t | 0.37324172 kg | Other |
| Pennyweight | dwt | 0.0015551738 kg | Other |
| Dram (avoirdupois) | dr | 0.0017718452 kg | US customary |
| Slug | slug | 14.593903 kg | US customary |
| Quintal | q | 100 kg | Metric |
| Hundredweight (US) | cwt | 45.359237 kg | US customary |
| Hundredweight (UK) | cwt UK | 50.802345 kg | Imperial |
| Dalton (atomic mass unit) | Da | 1.6605391×10⁻²⁷ kg | Other |
Frequently asked questions
What is the SI unit of weight and mass?
This converter uses the kilogram (kg) as its reference unit; every other unit is defined relative to it.
How many weight and mass units can I convert?
21 units are supported here, across SI, Metric, US customary, Imperial, Other systems. Every pair can be converted in both directions.
Does this weight and mass converter work offline?
Yes. Once the page has loaded, every calculation runs locally in your browser — nothing is sent to a server.