Weight Converter

Enter a weight in grams, kilograms, metric tonnes, ounces, pounds or stones and this converter shows the equivalents together, including a stones-and-pounds figure for UK and Irish body weights. People use it to read bathroom scales and medical records across systems, to convert recipe and parcel weights, and to compare gym plates or luggage allowances.

All factors come from the international pound of 1959, which is defined as exactly 0.45359237 kg, so the conversions are exact apart from display rounding. Ounces here are the everyday avoirdupois ounce (1/16 lb); precious metals use the heavier troy ounce, covered below.

If you are converting your body weight to track progress, the BMI calculator and the weight loss percentage calculator accept either kilograms or pounds directly.

The pound's value was fixed by the 1959 international yard and pound agreement and is listed in NIST Handbook 44. Strictly, these are units of mass; scales measure the force of gravity and display it as mass, which is fine on Earth. The US ton (short ton) is 2,000 lb, or 907.18 kg, and the UK long ton is 2,240 lb, or 1,016.05 kg — neither is the same as the metric tonne, so check which one a shipping quote or vehicle rating means.

Quick look-up values, rounded to one decimal place.

• Metric tonne (t): 1,000 kg, about 2,204.6 lb. Used for freight, vehicles and materials almost everywhere outside the US.
• US short ton: 2,000 lb (907.2 kg). Used for US truck ratings, coal and gravel.
• UK long ton: 2,240 lb (1,016.0 kg). Still seen in shipping and older British specifications.
• Troy ounce: 31.103 g, about 10% heavier than the 28.35 g everyday ounce. Gold, silver and platinum prices are quoted per troy ounce, so do not use this converter's ounces for bullion.
• Carat (gemstones): 0.2 g, a separate unit from the karat used for gold purity.

To go from kilograms to pounds in your head, double the kilograms and add 10%: 80 kg → 160 + 16 = 176 lb (exact: 176.37). To go from pounds to kilograms, halve and subtract 10%: 200 lb → 100 − 10 = 90 kg (exact: 90.72). For stones, remember that 1 stone is about 6.35 kg, so 10 stone is about 63.5 kg. If you need to turn a volume of liquid into a weight, use the density calculator — water is 1 kg per liter, but oils and syrups are not.