| From | To | Multiply by | Example |
|---|---|---|---|
| Kilograms (kg) | Pounds (lbs) | 2.20462 | 70 kg = 154.32 lbs |
| Pounds (lbs) | Kilograms (kg) | 0.45359 | 150 lbs = 68.04 kg |
| Grams (g) | Ounces (oz) | 0.03527 | 100 g = 3.527 oz |
| Ounces (oz) | Grams (g) | 28.3495 | 8 oz = 226.80 g |
| Stone (st) | Kilograms (kg) | 6.35029 | 11 st = 69.85 kg |
| Metric Ton (t) | Pounds (lbs) | 2204.62 | 1 t = 2,204.62 lbs |
| US Short Ton | Kilograms (kg) | 907.185 | 1 short ton = 907.19 kg |
| Troy Ounce (toz) | Grams (g) | 31.1035 | 1 toz = 31.10 g |
Weight & Mass Conversion Guide — Metric, Imperial, Avoirdupois & Troy
Weight (force due to gravity) and mass (amount of matter) are technically different, but in everyday use they are treated as equivalent. Here is everything you need to understand the major weight systems.
Metric System — Base Unit: Kilogram (kg)
The kilogram is the SI base unit of mass. 1 kg = 1,000 g = 1,000,000 mg. 1 metric ton (tonne) = 1,000 kg. The kilogram was redefined in 2019 based on the Planck constant — the most stable definition in history.
Imperial / Avoirdupois System
Used in the US and partially in the UK. 1 pound = 16 ounces = 7,000 grains. 1 stone (UK) = 14 pounds. 1 short ton (US) = 2,000 lbs. 1 long ton (UK) = 2,240 lbs.
Troy System — Precious Metals
Used for gold, silver, and gemstones. 1 troy ounce = 31.1035 g (heavier than an avoirdupois ounce = 28.35 g). 1 troy pound = 12 troy ounces. All gold prices quoted in troy ounces.
Real-World Weight References
US nickel coin: 5 g | Standard egg: ~60 g | iPhone 15: 171 g | Adult human: 62–90 kg | Car: 1,400–2,000 kg | Elephant: ~5,000 kg | Blue whale: ~150,000 kg