Weight tools
Weight and Mass Converter
Convert everyday, scientific, jewelry, shipping, and imperial mass/weight units.
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Instant results1 kilogram [kg] = 1000 gram [g]
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View all categories →All weight units
| Unit | Symbol | Conversion factor | Quick links |
|---|---|---|---|
| kilogram | kg | Base unit | Reference unit |
| gram | g | 1 gram [g] = 0.001 kg | to kg from kg |
| milligram | mg | 1 milligram [mg] = 0.000001 kg | to kg from kg |
| microgram | µg | 1 microgram [µg] = 1E-9 kg | to kg from kg |
| nanogram | ng | 1 nanogram [ng] = 1E-12 kg | to kg from kg |
| ton (metric) | t | 1 ton (metric) [t] = 1000 kg | to kg from kg |
| pound | lb | 1 pound [lb] = 0.453592 kg | to kg from kg |
| ounce | oz | 1 ounce [oz] = 0.02835 kg | to kg from kg |
| carat | ct | 1 carat [ct] = 0.0002 kg | to kg from kg |
| ton (short US) | ton US | 1 ton (short US) [ton US] = 907.18474 kg | to kg from kg |
| ton (long UK) | ton UK | 1 ton (long UK) [ton UK] = 1016.046909 kg | to kg from kg |
| stone | st | 1 stone [st] = 6.350293 kg | to kg from kg |
| grain | gr | 1 grain [gr] = 0.000065 kg | to kg from kg |
| slug | slug | 1 slug [slug] = 14.593903 kg | to kg from kg |
| dalton | Da | 1 dalton [Da] = 1.660539E-27 kg | to kg from kg |
| pound (troy) | lb t | 1 pound (troy) [lb t] = 0.373242 kg | to kg from kg |
| ounce (troy) | oz t | 1 ounce (troy) [oz t] = 0.031103 kg | to kg from kg |
| pennyweight | dwt | 1 pennyweight [dwt] = 0.001555 kg | to kg from kg |
| scruple | s.ap | 1 scruple [s.ap] = 0.001296 kg | to kg from kg |
| quintal (metric) | cwt | 1 quintal (metric) [cwt] = 100 kg | to kg from kg |
| hundredweight (US) | cwt US | 1 hundredweight (US) [cwt US] = 45.359237 kg | to kg from kg |
| hundredweight (UK) | cwt UK | 1 hundredweight (UK) [cwt UK] = 50.802345 kg | to kg from kg |
| quarter (US) | qr US | 1 quarter (US) [qr US] = 11.339809 kg | to kg from kg |
| quarter (UK) | qr UK | 1 quarter (UK) [qr UK] = 12.700586 kg | to kg from kg |
| gamma | γ | 1 gamma [γ] = 1E-9 kg | to kg from kg |
| electron mass | me | 1 electron mass [me] = 9.109384E-31 kg | to kg from kg |
| proton mass | mp | 1 proton mass [mp] = 1.672622E-27 kg | to kg from kg |
| Earth's mass | M⊕ | 1 Earth's mass [M⊕] = 5.9722E+24 kg | to kg from kg |
| Sun's mass | M☉ | 1 Sun's mass [M☉] = 1.98847E+30 kg | to kg from kg |
Accuracy and Sources
Weight and mass factors use kilogram as the reference unit, including metric, avoirdupois, troy, and scientific units where configured. Content was last reviewed on 2026-05-21. For safety-critical work, confirm results against the relevant official standard.
How weight conversion works
Weight conversion changes a measurement from one unit to another using a fixed factor or formula. Use the calculator above for instant results, then check the table and related converter links for common values.
Frequently Asked Questions
View sitemap →What is the base unit for weight?
The reference base unit used on this page is kg.
Are these weight conversions accurate?
Yes, the calculator uses the conversion factors listed on the page. For critical work, verify results with an authoritative standard.