Free Online Weight & Mass Converter
🔒 Runs in your browser — nothing is sent to a serverWeight & mass converter for every common metric and imperial unit — milligrams, grams, kilograms, metric tonnes, ounces, pounds, stones and US short tons. Type a value on either side, pick the units, and the result updates instantly with full control over decimal precision. Everything runs 100% inside your browser; nothing is uploaded, logged or sent to any server.
Supported units: Milligram (mg), Gram (g), Kilogram (kg), Metric tonne (t), Ounce (oz), Pound (lb), Stone (st), US short ton (ton).
Kilogram (kg) → Pound (lb)
Quick reference table
| Kilogram (kg) | Pound (lb) |
|---|---|
| 1 kg | 2.2046 lb |
| 2 kg | 4.4092 lb |
| 5 kg | 11.0231 lb |
| 10 kg | 22.0462 lb |
| 25 kg | 55.1156 lb |
| 50 kg | 110.2311 lb |
| 100 kg | 220.4623 lb |
Mass vs weight — the physics distinction
Strictly speaking, mass is the amount of matter in an object (measured in kilograms) while weight is the force that gravity exerts on that mass (measured in newtons). On Earth's surface 1 kg of mass is pulled down by about 9.81 N of gravitational force, so in everyday speech "weight" and "mass" are used interchangeably and reported in kilograms or pounds. This converter treats every unit as a mass — so a 70 kg person remains 70 kg on the Moon even though their gravitational weight there would be only about 116 N instead of the 686 N on Earth. For shipping, cooking, retail and medical dosing, mass is what you actually want, which is why scales worldwide are calibrated in kg / lb / oz rather than newtons.
Metric vs imperial weight systems
The metric system anchors everything to the kilogram, redefined in 2019 in terms of the Planck constant and divided into grams (1/1000), milligrams (1/1,000,000) and multiplied into metric tonnes (×1,000). The imperial / US Customary system uses the avoirdupois pound (1 lb = 16 oz, 14 lb = 1 stone in the UK, 2,000 lb = 1 US short ton). Since the 1959 international yard-and-pound agreement, 1 pound is defined as exactly 0.45359237 kg, so every cross-system conversion is a simple multiplication with no rounding ambiguity. The most common pitfall is the word "ton": this converter uses the US short ton (907 kg) — it does not handle the UK long ton (1,016 kg), which is rarely seen outside specialist British shipping documents.