Weight Converter
Convert milligrams, grams, kilograms, tonnes, ounces, pounds, and stone with the exact international pound. The page opens on 1 kg, which is 2.204623 lb.
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Result
About this tool
The base unit is the kilogram. Milligrams are 0.000001, grams 0.001, tonnes 1000. The pound is the international avoirdupois pound, exactly 0.45359237 kg. The ounce is that pound divided by 16, 0.028349523125 kg. The stone is 14 pounds, 6.35029318 kg. The page opens with 1 in the left field, kilograms on the left, and pounds on the right. 1 kg prints as 2.204623 lb. The formula line under the result uses eight significant digits and prints 1 kg = 2.2046226 lb. 1 lb the other way prints as 0.4535924 kg in the result, and the eight-digit formula line shows the exact 0.45359237. 1 oz prints as 28.34952 g. 1 g prints as 0.03527396 oz. 1 stone prints as 6.350293 kg. 1 kg prints as 0.157473 st. 70 kg prints as 154.3236 lb. 100 kg prints as 220.4623 lb. 16 oz prints as 1 lb.
The printed form keeps at most seven significant digits, avoids grouping commas, and switches to exponential notation only below 1e-9 or at 1e15 and above. A zero stays 0. Typing in the right-hand field converts backward with the same factors. Swap exchanges the two unit menus and moves the right-hand number into the left-hand field. The table under the form is not a fixed poster. Kilograms, grams, milligrams, and tonnes use 1, 2, 5, 10, 25, 50, and 100. Pounds use 1, 2, 5, 10, 100, 150, and 200. Ounces use 1, 2, 4, 8, 12, 16, and 32. Stone uses 8, 9, 10, 11, 12, 13, 14, and 16. Table cells use six significant digits.
There is no troy ounce, no pennyweight, and no US survey pound. A stone is the 14-pound avoirdupois stone, not a gemstone mass. Negative numbers convert with the same factor. A blank field clears the other field and asks for a value. A word that is not a finite number does the same. Preset pages select the pair, including kilograms to pounds and stone to kilograms, and leave the value at 1. The factors are constants in the script. The page does not fetch a rate and does not round to the nearest ounce for a kitchen scale.
1 t prints as 2204.623 lb. A tonne is 1000 kg, and 1000 times the kilogram-to-pound factor, kept to seven significant digits, is that figure. The quick table under a tonne selection uses six significant digits, so a table cell and the result line are not required to show the same character string for the same quantity. 1 lb to ounces is 16, and that pair meets exactly because the ounce factor is the pound factor divided by 16.
Example. The page opens on 1 kg, which prints as 2.204623 lb. The formula line uses one more digit: 1 kg = 2.2046226 lb. 1 lb prints as 0.4535924 kg.
Limit. The pound is exactly 0.45359237 kg. Units are mg, g, kg, t, oz, lb, and stone. No troy ounce. Display keeps at most 7 significant digits.
Frequently asked questions
How many pounds is 1 kg?
2.204623 lb at the 7-digit display. The definition used is 1 lb = 0.45359237 kg, so the 8-digit formula line is 2.2046226. 70 kg prints as 154.3236 lb and 100 kg as 220.4623 lb.
What is 1 ounce in grams?
28.34952 g. The ounce factor is the pound divided by 16, 0.028349523125 kg. 16 oz prints as 1 lb. 1 g prints as 0.03527396 oz.
How is a stone defined here?
14 avoirdupois pounds, factor 6.35029318 kg. 1 stone prints as 6.350293 kg, and 1 kg prints as 0.157473 st. It is not a troy or jeweler's unit.
Which numbers are in the table?
Most units use 1, 2, 5, 10, 25, 50, and 100. Pounds use 1, 2, 5, 10, 100, 150, and 200. Ounces use 1, 2, 4, 8, 12, 16, and 32. Stone uses 8 through 14, then 16. Table cells use 6 significant digits.