Weight and Mass

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kilogram [kg]gram [g]milligram [mg]ton (metric) [t]pound [lbs]ounce [oz]carat [car, ct]ton (short) [ton (US)]ton (long) [ton (UK)]Atomic mass unit [u]exagram [Eg]petagram [Pg]teragram [Tg]gigagram [Gg]megagram [Mg]hectogram [hg]dekagram [dag]decigram [dg]centigram [cg]microgram [µg]nanogram [ng]picogram [pg]femtogram [fg]attogram [ag]daltonkilogram-force square second/meterkilopound [kip]kipslugpound-force square second/footpound (troy or apothecary)poundal [pdl]ton (assay) (US) [AT (US)]ton (assay) (UK) [AT (UK)]kiloton (metric) [kt]quintal (metric) [cwt]hundredweight (US)hundredweight (UK)quarter (US) [qr (US)]quarter (UK) [qr (UK)]stone (US)stone (UK)tonne [t]pennyweight [pwt]scruple (apothecary) [s.ap]grain [gr]gammatalent (Biblical Hebrew)mina (Biblical Hebrew)shekel (Biblical Hebrew)bekan (Biblical Hebrew)gerah (Biblical Hebrew)talent (Biblical Greek)mina (Biblical Greek)tetradrachma (Biblical Greek)didrachma (Biblical Greek)drachma (Biblical Greek)denarius (Biblical Roman)assarion (Biblical Roman)quadrans (Biblical Roman)lepton (Biblical Roman)Planck massElectron mass (rest)Muon massProton massNeutron massDeuteron massEarth’s massSun’s mass

kilogram [kg]gram [g]milligram [mg]ton (metric) [t]pound [lbs]ounce [oz]carat [car, ct]ton (short) [ton (US)]ton (long) [ton (UK)]Atomic mass unit [u]exagram [Eg]petagram [Pg]teragram [Tg]gigagram [Gg]megagram [Mg]hectogram [hg]dekagram [dag]decigram [dg]centigram [cg]microgram [µg]nanogram [ng]picogram [pg]femtogram [fg]attogram [ag]daltonkilogram-force square second/meterkilopound [kip]kipslugpound-force square second/footpound (troy or apothecary)poundal [pdl]ton (assay) (US) [AT (US)]ton (assay) (UK) [AT (UK)]kiloton (metric) [kt]quintal (metric) [cwt]hundredweight (US)hundredweight (UK)quarter (US) [qr (US)]quarter (UK) [qr (UK)]stone (US)stone (UK)tonne [t]pennyweight [pwt]scruple (apothecary) [s.ap]grain [gr]gammatalent (Biblical Hebrew)mina (Biblical Hebrew)shekel (Biblical Hebrew)bekan (Biblical Hebrew)gerah (Biblical Hebrew)talent (Biblical Greek)mina (Biblical Greek)tetradrachma (Biblical Greek)didrachma (Biblical Greek)drachma (Biblical Greek)denarius (Biblical Roman)assarion (Biblical Roman)quadrans (Biblical Roman)lepton (Biblical Roman)Planck massElectron mass (rest)Muon massProton massNeutron massDeuteron massEarth’s massSun’s mass

Popular weight and mass unit conversions

Complete list of weight and mass units for conversion

• Kilogram (kg)
• Gram (g) = 0.001 kg
• Milligram (mg) = 1.0E-6 kg
• Metric Ton (t) = 1,000 kg
• Pound (lbs) = 0.45359237 kg
• Ounce (oz) = 0.0283495231 kg
• Carat (ct) = 0.0002 kg
• Short Ton (US) = 907.18474 kg
• Long Ton (UK) = 1,016.0469088 kg
• Atomic Mass Unit (u) = 1.6605402E-27 kg
• Exagram (Eg) = 1.0E+15 kg
• Petagram (Pg) = 1,000,000,000,000 kg
• Teragram (Tg) = 1,000,000,000 kg
• Gigagram (Gg) = 1,000,000 kg
• Megagram (Mg) = 1,000 kg
• Hectogram (hg) = 0.1 kg
• Dekagram (dag) = 0.01 kg
• Decigram (dg) = 0.0001 kg
• Centigram (cg) = 1.0E-5 kg
• Microgram (µg) = 1.0E-9 kg
• Nanogram (ng) = 1.0E-12 kg
• Picogram (pg) = 1.0E-15 kg
• Femtogram (fg) = 1.0E-18 kg
• Attogram (ag) = 1.0E-21 kg
• Dalton = 1.6605300000013E-27 kg
• Kilogram-force second²/meter = 9.80665 kg
• Kilopound (kip) = 453.59237 kg
• Slug = 14.5939029372 kg
• Troy Pound = 0.3732417216 kg
• Poundal (pdl) = 0.0140867196 kg
• Assay Ton (US) = 0.02916667 kg
• Assay Ton (UK) = 0.0326666667 kg
• Kiloton (metric) = 1,000,000 kg
• Quintal (metric) = 100 kg
• Hundredweight (US) = 45.359237 kg
• Hundredweight (UK) = 50.80234544 kg
• Quarter (US) = 11.33980925 kg
• Quarter (UK) = 12.70058636 kg
• Stone (US) = 5.669904625 kg
• Stone (UK) = 6.35029318 kg
• Tonne (metric ton) = 1,000 kg
• Pennyweight (pwt) = 0.0015551738 kg
• Scruple (apothecary) = 0.0012959782 kg
• Grain = 6.47989E-5 kg
• Gamma = 1.0E-9 kg
• Biblical Units:
  • Talent (Hebrew) = 34.2 kg
  • Mina (Hebrew) = 0.57 kg
  • Shekel (Hebrew) = 0.0114 kg
  • Bekan (Hebrew) = 0.0057 kg
  • Gerah (Hebrew) = 0.00057 kg
  • Talent (Greek) = 20.4 kg
  • Mina (Greek) = 0.34 kg
  • Tetradrachma (Greek) = 0.0136 kg
  • Didrachma (Greek) = 0.0068 kg
  • Drachma (Greek) = 0.0034 kg
  • Denarius (Roman) = 0.00385 kg
  • Assarion (Roman) = 0.000240625 kg
  • Quadrans (Roman) = 6.01563E-5 kg
  • Lepton (Roman) = 3.00781E-5 kg
• Planck Mass = 2.17671E-8 kg
• Electron Mass (rest) = 9.1093897E-31 kg
• Muon Mass = 1.8835327E-28 kg
• Proton Mass = 1.6726231E-27 kg
• Neutron Mass = 1.6749286E-27 kg
• Deuteron Mass = 3.343586E-27 kg
• Earth’s Mass = 5.9760000000002E+24 kg
• Sun’s Mass = 2.0E+30 kg

While often used interchangeably in everyday conversation, weight and mass are distinct concepts in physics.  

• Mass is a measure of the amount of matter in an object. It’s a fundamental property that remains constant regardless of location.  
• Weight, on the other hand, is the force exerted on an object due to gravity. It changes depending on the gravitational pull of the location.  

Think of it this way: your mass is the same on Earth and the Moon, but your weight is less on the Moon because of its weaker gravity.

Popular Weight and Mass Unit Conversions

Our unit conversion site makes it easy to switch between different units of weight and mass. Here are some of the most popular conversions:

Metric Units

• kg to lbs: Kilograms (kg) to pounds (lbs) is a common conversion, especially when dealing with body weight or shipping packages internationally.
• lbs to kg: Pounds (lbs) to kilograms (kg) is the reverse conversion, useful for understanding weights given in the imperial system.
• g to kg: Grams (g) to kilograms (kg) is a simple conversion within the metric system, often used in cooking or scientific measurements.  
• kg to g: Kilograms (kg) to grams (g) is the opposite, allowing you to convert larger masses into smaller units.  
• mg to g: Milligrams (mg) to grams (g) is crucial for dealing with very small masses, often seen in medicine or nutritional information.
• g to mg: Grams (g) to milligrams (mg) helps convert larger masses into these tiny units.  

Imperial Units

• lbs to oz: Pounds (lbs) to ounces (oz) is a common conversion used in everyday life, especially in the US, for measuring ingredients or smaller objects.
• oz to lbs: Ounces (oz) to pounds (lbs) allows you to convert smaller weights into the larger pound unit.  

Metric and Imperial Conversions

• g to oz: Grams (g) to ounces (oz) is essential when converting between the metric and imperial systems, often used in recipes or international shipping.
• oz to g: Ounces (oz) to grams (g) is the reverse conversion, helpful for understanding weights given in ounces.
• g to lbs: Grams (g) to pounds (lbs) is used when converting smaller metric units to larger imperial ones.
• lbs to g: Pounds (lbs) to grams (g) is the opposite, converting from imperial to metric.
• kg to oz: Kilograms (kg) to ounces (oz) is a less common but still useful conversion for larger masses.
• oz to kg: Ounces (oz) to kilograms (kg) converts smaller imperial units to larger metric ones.

UK Specific Units

• st (UK) to lbs: Stone (st) to pounds (lbs) is a conversion specific to the UK and Ireland, often used to measure body weight.  
• lbs to st (UK): Pounds (lbs) to stone (st) is the reverse conversion, helpful for understanding weights given in stone.