Reviewed & updated for 2026 by Rakesh Choudhary, PhD · How we calculate
Common weight conversions
| From | To | Multiply by |
|---|---|---|
| Pounds | Kilograms | 0.453592 |
| Kilograms | Pounds | 2.20462 |
| Ounces | Grams | 28.3495 |
| Grams | Ounces | 0.0353 |
| Stones | Pounds | 14 |
| Stones | Kilograms | 6.35029 |
| Metric tons | Kilograms | 1000 |
| US tons | Kilograms | 907.185 |
Quick reference: body weight conversions
Converting body weight between kilograms, pounds, and stone is the most-searched weight question. The everyday values, worked out:
| Kilograms | Pounds | Stone & lb |
|---|---|---|
| 50 kg | 110.2 lb | 7 st 12 lb |
| 60 kg | 132.3 lb | 9 st 6 lb |
| 70 kg | 154.3 lb | 11 st 0 lb |
| 80 kg | 176.4 lb | 12 st 8 lb |
| 90 kg | 198.4 lb | 14 st 2 lb |
| 100 kg | 220.5 lb | 15 st 10 lb |
Kitchen amounts: 1 oz = 28.35 g · 1 lb = 453.6 g · 1 cup of flour ≈ 120 g · 1 cup of sugar ≈ 200 g.
How to convert weight units by hand
- Kilograms → pounds: multiply by 2.20462. Example: 70 kg × 2.20462 = 154.3 lb.
- Pounds → kilograms: multiply by 0.453592 (or divide by 2.205). Example: 150 lb × 0.453592 = 68.0 kg.
- Ounces → grams: multiply by 28.3495. Example: 8 oz × 28.3495 = 226.8 g.
- Stone → kilograms: multiply by 6.35029. Example: 11 st × 6.35029 = 69.9 kg.
A stone is 14 pounds, so to read pounds as stone, divide by 14 and the remainder is the leftover pounds. The converter above handles kilograms, pounds, ounces, grams, stone, and metric tonnes together.
FAQs
How many pounds in a kilogram?
1 kilogram equals 2.20462 pounds. So 70 kg = 154.32 lbs. To go the other way, 1 pound = 0.453592 kg, so 150 lbs = 68.04 kg.
How many grams in an ounce?
1 ounce (oz) equals 28.3495 grams (g). 1 pound = 16 ounces = 453.592 grams. To convert grams to ounces, divide by 28.3495.
What is a stone?
A stone (st) is a British unit equal to 14 pounds (6.35029 kilograms). Often used to describe body weight in the UK and Ireland. 10 stone = 140 lbs = 63.5 kg.
What's the difference between mass and weight?
In everyday use, they're interchangeable. Technically: mass is the amount of matter (constant, regardless of location); weight is the force exerted by gravity on that mass (varies with gravity). Both are commonly expressed in kg or lbs on Earth. On the Moon, your mass stays the same but your weight is 1/6th of Earth's.
Why does the US use pounds instead of kilograms?
Historical and political reasons. The US passed the Metric Conversion Act in 1975 to encourage metric adoption but never made it mandatory. Most US industry uses both, manufacturing, science, and military all use metric internally, while consumer products and daily life use imperial.
How accurate are these weight conversions?
Conversions use international standard ratios: 1 lb = 0.45359237 kg exactly (by international agreement, 1959). 1 oz = 28.3495231 grams. All conversions are mathematically exact to the precision shown.
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