Weight & Mass Converter
Enter a weight below to convert between metric, avoirdupois, and troy mass units.
Convert Weight & Mass
Enter a value and select the units to convert between kilograms, pounds, and ounces.
You can change the units using the dropdowns above or click on a unit button.
Common Weight & Mass Reference Points
Here are some common weight & mass values in Kilogram (kg), Pound (Avoirdupois) (lb), and Ounce (oz). Click any preset value or arrow to load it into the converter.
| Description | Kilogram (kg) | Pound (Avoirdupois) (lb) | Ounce (oz) |
|---|---|---|---|
| 100 grams (0.1 kg) | 0.1 | 0.22046 | 3.5274 |
| Half kilogram (500 g) | 0.5 | 1.10231 | 17.63698 |
| 1 kilogram SI base mass | 1 | 2.20462 | 35.27396 |
| Bag of flour (5 kg) | 5 | 11.02311 | 176.36981 |
| 10 kilograms benchmark | 10 | 22.04623 | 352.73962 |
| Checked airline luggage (23 kg) | 23 | 50.70632 | 811.30112 |
| 100 kilograms reference | 100 | 220.46226 | 3,527.39619 |
Weight & Mass Conversion Formulas
Use the following formulas to convert between kilograms, pounds, and ounces.
1 avoirdupois pound is legally defined as exactly 0.45359237 kilograms (and 1 pound = 16 ounces).
More Kilogram & Pound Conversions
Convert from Kilograms
Frequently Asked Questions
All Weight & Mass Conversion Calculators (34)
Select any dedicated weight & mass pair below for worked examples and printable tables
Category Conversion Matrix
Simultaneous comparison of 39 units in this category
Weight & Mass Unit Definitions & Symbols
Kilogram (kg)
SIThe fundamental SI unit of mass.
Gram (g)
METRICMetric unit equal to one-thousandth of a kilogram (0.001 kg).
Milligram (mg)
METRICOne-thousandth of a gram (10⁻⁶ kg).
Microgram (µg)
METRICOne-millionth of a gram (10⁻⁹ kg).
Nanogram (ng)
METRICOne-billionth of a gram (10⁻¹² kg).
Picogram (pg)
METRICOne-trillionth of a gram (10⁻¹⁵ kg).
Femtogram (fg)
METRIC10⁻¹⁸ kilograms.
Attogram (ag)
METRIC10⁻²¹ kilograms.
Centigram (cg)
METRICOne-hundredth of a gram (10 mg).
Decigram (dg)
METRICOne-tenth of a gram (100 mg).
Dekagram (dag)
METRICEqual to 10 grams.
Hectogram (hg)
METRICEqual to 100 grams.
Metric Ton (Tonne / Megagram) (t)
METRICEqual to 1,000 kilograms (1 Megagram, approx. 2,204.62 lbs).
Gigagram (Gg)
SIEqual to 1,000,000 kilograms (1,000 metric tons).
Teragram (Tg)
SIEqual to 10⁹ kilograms (1 million metric tons).
Exagram (Eg)
SIEqual to 10¹⁵ kilograms.
Quintal (Metric) (q)
METRICMetric unit of mass equal to 100 kilograms.
Pound (Avoirdupois) (lb)
IMPERIALImperial and US Customary unit defined legally as exactly 0.45359237 kg.
Ounce (oz)
IMPERIALEqual to 1/16 of a pound (approx. 28.3495 grams).
Stone (UK) (st)
IMPERIALBritish imperial unit equal to 14 pounds (6.35029 kg).
US Short Ton (ton (US))
US CUSTOMARYUS Customary ton equal to 2,000 pounds (907.185 kg).
Imperial Long Ton (ton (UK))
IMPERIALBritish imperial ton equal to 2,240 pounds (1,016.047 kg).
Grain (gr)
IMPERIALTraditional unit equal to 1/7000 of an avoirdupois pound (exact 64.79891 mg).
Metric Carat (ct)
METRICGemstone mass unit equal to 0.2 grams (200 mg).
Troy Ounce (oz t)
OTHERPrecious metal (gold, silver, platinum) mass standard equal to 480 grains or exactly 31.1034768 grams.
Pennyweight (Troy) (dwt)
OTHERPrecious metal Troy unit equal to 24 grains or 1/20 of a troy ounce (1.55517 g).
Slug (slug)
IMPERIALImperial mass accelerated by 1 ft/s² under 1 lbf (approx. 32.17405 lbs or 14.5939 kg).
Kip (Kilopound) (kip)
US CUSTOMARYEngineering mass/load unit equal to 1,000 avoirdupois pounds (453.592 kg).
Quarter (US) (qr (US))
US CUSTOMARYUS quarter hundredweight (25 pounds = 400 ounces = 11.34 kg).
Quarter (UK Imperial) (qr (UK))
IMPERIALUK quarter hundredweight (28 pounds = 2 stones = 12.70 kg).
Hundredweight (US Short) (cwt (US))
US CUSTOMARYUS Customary hundredweight equal to 100 pounds (45.359 kg).
Hundredweight (UK Long) (cwt (UK))
IMPERIALBritish Imperial hundredweight equal to 112 pounds or 8 stone (50.802 kg).
Shekel (Biblical Hebrew) (shekel)
OTHERHistorical Levantine and Biblical weight standardized at approx. 11.4 grams.
Atomic Mass Unit (Dalton) (u)
SIUnified atomic mass unit (Dalton) equal to 1/12 of the mass of a carbon-12 atom.
Proton Rest Mass (mₚ)
OTHERRest mass of a single proton (1.6726×10⁻²⁷ kg).
Neutron Rest Mass (mₙ)
OTHERRest mass of a single neutron (1.6749×10⁻²⁷ kg).
Electron Rest Mass (mₑ)
OTHERRest mass of a stationary electron (9.1094×10⁻³¹ kg).
Earth's Mass (M⊕)
OTHERMass of planet Earth (approx. 5.9722×10²⁴ kg).
Solar Mass (Sun's Mass) (M☉)
OTHERAstronomical mass of our Sun (approx. 1.9885×10³⁰ kg).
References
- [1]NIST SI MassNIST OWM (NIST SI Mass)·SI Units — Mass: Avoirdupois, Metric & Commercial Weight Standards
- [2]NIST Handbook 44NIST HB 44 (NIST HB 44)·NIST Handbook 44 (Current Edition) — Specifications, Tolerances & Mass Conversion Tables
- [3]BIPM Kilogram StandardBIPM (BIPM SI-9)·SI Base Unit: The Kilogram (kg) — Definition via the Planck Constant (h)