Weight and mass converter
Convert kilograms, grams, milligrams, tons, pounds, ounces and arrobas.
How the calculation works
In daily use, "weight" and "mass" are treated as the same. The conversion takes everything to the kilogram and then to the target unit via fixed factors.
Key equivalences
- 1 kg = 1,000 g = 1,000,000 mg · 1 tonne = 1,000 kg
- 1 pound (lb) = 0.4536 kg → 1 kg ≈ 2.205 lb
- 1 ounce (oz) = 28.35 g (1 lb = 16 oz)
Step-by-step example
How many kilos is 150 pounds? 150 × 0.4536 = 68 kg. The other way: 80 kg × 2.205 = 176 lb.
Examples
- 70 kg = 154.3 lb (70 × 2.205).
- 1 arroba = 14.7 kg.
Frequently asked questions
How much is 1 pound in kg?
0.4536 kg. Shortcut: divide pounds by 2.2 to get kilos.
Mass vs weight?
Mass (kg) is the amount of matter; weight is gravity's force on it (in newtons). On Earth we treat them as equal day to day.
How many ounces in a pound?
16 ounces. One ounce is about 28.35 g.
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Updated on June 17, 2026 · by Rafael Rossi · Methodology & sources