⚖️ Weight & Mass ↑ Back to list
Weight & Mass Conversion: Kilograms, Pounds & Ounces
Understand the difference between mass and weight, and learn exact ratios for grams, kilograms, pounds, stones, and ounces.
By UnitCompiler Engineering • 4 min read • Published 2026-08-30
Mass vs. Weight
In everyday life, we use “weight” and “mass” interchangeably. However, in physics:
- Mass is the amount of matter in an object (measured in kilograms).
- Weight is the force exerted on that mass by gravity (
W = m × g).
The international avoirdupois pound is legally defined as exactly 0.45359237 kilograms.
Kilograms to Pounds Formula
Pounds (lbs) = Kilograms (kg) × 2.20462262
For a fast mental estimation: Double the kilograms and add 10% (e.g. 80 kg × 2 = 160; 160 + 16 = 176 lbs)
Ounces to Grams (Avoirdupois)
Grams (g) = Ounces (oz) × 28.349523
1 pound contains exactly 16 ounces
Conversion Reference Table
Weight Conversion Ratios
| From Unit | To Unit | Multiply By | Example |
|---|---|---|---|
| 1 Kilogram (kg) | Pounds (lbs) | 2.20462 | 70 kg = 154.32 lbs |
| 1 Pound (lb) | Kilograms (kg) | 0.453592 | 180 lbs = 81.65 kg |
| 1 Ounce (oz) | Grams (g) | 28.3495 | 8 oz = 226.8 g |
| 1 Stone (st - UK) | Pounds (lbs) | 14.0 | 11 st = 154 lbs |
| 1 Metric Tonne (t) | Kilograms (kg) | 1000.0 | 2.5 t = 2,500 kg |
Precious Metals: Troy Ounces
Gold, silver, and precious stones are weighed in troy ounces (1 oz t ≈ 31.1035 g), which is heavier than a standard avoirdupois ounce (28.35 g).