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Weight Converter

kg, lb, oz, stone, grams and tons

By Guga — BrowserTools maintainer, Tbilisi, Georgia Updated 2026-09-21
Free Private No uploads
What is Weight Converter?

Mass conversion here runs on one table of exact factors rather than tidy round numbers, so a pound is 0.45359237 kilograms whenever you ask for it. Type into Value, pick the source and target units, and the answer lands immediately — then look below, where the same number is shown in all eight units at once. The stone is the British fourteen pounds, not a metric quintal, and both ton flavours are separated: a US short ton is 2000 lb, a UK long ton is 2240 lb. Results are printed to as many as eight decimal places; below a millionth or above a trillion the display switches to scientific notation, which keeps seven significant figures. The one omission worth knowing is the troy ounce, the 31.1034768 g unit used for gold and silver, which is not in the table.

Convert between kilograms, pounds, ounces, grams, stones, US tons and metric tonnes instantly. Enter one value and every other unit updates live — perfect for fitness, cooking and shipping.

Private Weight Converter In Your Browser

Weight Converter is processed locally with client-side JavaScript. Your files never touch a server, and there is no queue to wait in.

Step-by-Step

How to use Weight Converter

1

Key your figure into the Value box, which starts at 1.

2

Choose the unit you already have in the From unit dropdown.

3

Set To unit to the destination measure, using the arrow between the fields if you need the pair reversed.

4

Read the single Result line, then click any tile in the All weight units grid to promote that unit to your target.

Key Capabilities
  • Nine mass units including milligram, stone, US short ton and UK long ton
  • Factors taken from the exact 1959 international pound, not rounded constants
  • A live grid that converts your entry into every unit simultaneously
  • Results shown to up to eight decimal places, with scientific notation outside the normal range
Common Use Cases
  • A nurse converting a patient's recorded weight in kilograms to pounds for a US chart entry.
  • A baker scaling a British recipe that lists sugar in ounces against a scale set in grams.
  • A shipping clerk checking whether a pallet listed as 900 kg fits a 1-tonne or a 2000 lb vehicle rating.
Clear Answers

Frequently Asked Questions

Is a pound here really 0.45359237 kg?
Yes. The table stores the international pound at its exact definition of 0.45359237 kg, which is why 1 kg comes out as 2.20462262 lb rather than 2.2. Because the stone and both tons are defined as multiples of that pound, they inherit the same precision: 14 lb to the stone, 2000 lb to a US short ton, 2240 lb to a UK long ton.
Why does 1 milligram in stones come out in scientific notation?
Anything smaller than 0.000001, or larger than a trillion, is printed as 1.574730e-7 style output with seven significant figures instead of a long decimal. Eight decimal places cannot represent a value that small in a readable way, so the formatter switches notation rather than printing a row of zeros.
Can I convert gold weights here?
Not accurately. Bullion is quoted in troy ounces, of which there are 12 in a troy pound of 31.1034768 g — a completely different ounce from the avoirdupois one in this table. Convert to grams first and do the troy arithmetic yourself, or use a bullion-specific tool.
Does a stone mean the same thing everywhere?
No. The stone is fourteen pounds in Britain and Ireland, and it also appears in Australian and older American usage. It has no metric equivalent, which is why it is 6.35029318 kg here rather than a round number.

Related Guides

View all guides →
unitsFeet and Inches to Centimeters: Height ExplainedA height like 5′10″ is a pair of numbers, not a decimal: five feet plus ten inches, with the feet converting at 30.48 centimeters and the inches at 2.54. The arithmetic, the four mistakes that corrupt height records, and the settings where precision actually matters are below; to convert one height in either direction, the height converter linked from this guide gives the exact pair instantly.