Weight converter
Kilograms, pounds, stone, ounces and three kinds of ton
Type a weight and pick two units. The example turns 1 kilogram into pounds.
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The same amount in every unit
How weights convert
Every weight here is a fixed multiple of the kilogram. The pound has been exactly 0.45359237 kg since the 1959 international agreement (NIST Handbook 44, Appendix C). From it come the ounce (1/16 lb, 28.349523125 g), the stone (14 lb, 6.35029318 kg) and the tons. Strictly these are masses; in everyday use, and on this page, we call them weights.
Three kinds of ton
A US ton, also called a short ton, is 2,000 pounds (907.18474 kg). A UK ton, or long ton, is 2,240 pounds (1016.0469088 kg). A metric ton, or tonne, is 1,000 kg. They differ by up to 12%, so check which one a document means.
Troy ounces
Gold, silver and platinum are weighed in troy ounces of exactly 31.1034768 g, about 10% more than an ordinary ounce. Use the troy ounce only for precious metals.
Quick checks
A kilogram is about 2.2 pounds. To turn kg into pounds in your head, double it and add a tenth: 70 kg is about 140 + 14 = 154 lb. For body weight in stone, try the kg to stone converter; for one pair with a chart, see kg to lbs.
Rounding
The answer is worked out from the exact definition, then shown to 4 decimal places (6 significant figures for numbers below 1). It says "exactly" only when nothing was rounded.