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Weight converter

Unit converters

Convert kg, lb, oz, g, ton and more.

Updated

Convert weight

In every unit

UnitValueCopy
Milligram
mg
1,000,000
Gram
g
1,000
Kilogram
kg
1
Metric ton
t
0.001
Ounce (avoirdupois)
oz
35.27396195
Pound
lb
2.20462262
Stone
st
0.15747304
US short ton
ton
0.00110231

Quick start

How to convert weight

Type a value, pick the source unit, copy the result from any row in the table.

  1. Step 1
    Type the value

    Enter your measurement and pick its unit. Switching units converts the displayed value so the meaning is preserved.

  2. Step 2
    Read every unit

    All eight units update live — milligrams through metric tons, ounces through US short tons. The source unit is highlighted.

  3. Step 3
    Copy a row

    Hit Copy on any row to grab that unit's value. Very small or large numbers switch to scientific notation automatically.

In-depth guide

Weight converter — kilograms, pounds, ounces and more

Convert between eight common mass units — milligrams through metric tons, ounces through US short tons. Type a value, pick the source unit, every other unit updates live in the result table.

Supported units

UnitSymbolIn grams
Milligrammg0.001
Gramg1
Kilogramkg1 000
Metric tont1 000 000
Ounce (avoir.)oz28.349523125
Poundlb453.59237
Stonest6 350.29318
US short tonton907 184.74

Worth memorising

  • 1 kg ≈ 2.2046 lb
  • 1 lb = 453.59237 g (exact)
  • 1 oz = 28.349523125 g (exact)
  • 1 stone = 14 lb (≈ 6.35 kg)
  • 1 metric ton = 1000 kg = 1 Mg
  • 1 US short ton = 2000 lb ≈ 907.18 kg

Typical use cases

  • Cooking — translate American recipes (oz, lb) into European grams.
  • Shipping — pick the right carrier weight bracket (kg vs lb).
  • Fitness — convert body weight between stone, kg and lb across regional tracking apps.
  • Manufacturing — translate material spec sheets between SI and US customary units.
  • Science — work with milligrams for chemistry and pharmacy dosing.

Frequently asked questions

Mass or weight?

Strictly mass — grams, kilograms and pounds are all mass units. Weight (force) varies with gravity. We use 'weight' in the title because it's what people search for; the math is mass.

Pound and ounce — avoirdupois or troy?

Avoirdupois (the everyday pound, 453.59237 g exactly). Troy ounces (~31.103 g) are used only for precious metals — gold, silver, platinum — and aren't part of this tool.

What's the difference between US short ton, UK long ton and metric ton?

US short ton = 2000 lb (≈ 907.18 kg). UK long ton = 2240 lb (≈ 1016.05 kg). Metric ton (tonne) = 1000 kg exactly. We include US short ton and metric ton; the long ton is rarely used outside historic UK shipping records.

What's a stone?

A British unit, 14 lb (≈ 6.35 kg). Still used for body weight in the UK and Ireland (e.g. '11 stone 4').

How precise is the conversion?

Up to 8 significant digits. The factors used are the 1959 international yard and pound definitions — same as every modern engineering standard.

Does this work offline?

Yes. All math runs in your browser; no request is sent during conversion.

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