| Name of unit
| Symbol
| Relation to SI units
|
| Mass, m
|
| kilogram | kg
| ( SI base unit)
|
| electron rest mass | me
| ≈ 9.109 381 88×10-31 ± 72×10-39 kg
|
| atomic unit of mass | au
| ≡ me ≈ 9.109 381 88×10-31 ± 72×10-39 kg
|
| unified atomic mass unit | amu
| ≈ 1.660 538 73×10-27 ± 13×10-35 kg
|
| dalton | Da
| ≈ 1.660 902 10×10-27 ± 13×10-35 kg
|
| gamma | γ
| ≡ 1 μg
|
| point |
| ≡ 1/100 kt (metric) = 2 mg
|
| mite |
| ≡ 1/20 gr = 3.239 945 5 mg
|
| mite (metric) |
| ≡ 1/20 g = 50 mg
|
| grain | gr
| ≡ 64.798 91 mg
|
| crith |
| ≈ 89.9349 mg
|
| carat (metric) | kt
| ≡ 200 mg
|
| carat | kt
| ≡ 3 1/6 gr ≈ 205.196 548 333 mg
|
| sheet |
| ≡ 1/700 lb av = 647.9891 mg
|
| scruple (avoirdupois) | s av
| ≡ 20 gr = 1.295 978 2 g
|
| pennyweight | dwt; pwt
| ≡ 1/20 oz t = 1.555 173 84 g
|
| dram (avoirdupois) | dr av
| ≡ 27 11/32 gr = 1.771 845 195 312 5 g
|
| dram (apothecary; troy) | dr t
| ≡ 60 gr = 3.887 934 6 g
|
| hyl (CGS unit) |
| ≡ 1 gee × 1 g × 1 s²/m = 9.806 65 g
|
| ounce (avoirdupois) | oz av
| ≡ 1/16 lb = 28.349 523 125 g
|
| assay ton (short) | AT
| ≡ 1 mg × 1 sh tn ÷ 1 oz t ≈ 29.166 667 g
|
| ounce (apothecary; troy) | oz t
| ≡ 31.103 476 8 g
|
| assay ton (long) | AT
| ≡ 1 mg × 1 long tn ÷ 1 oz t ≈ 32.666 667 g
|
| mark |
| ≡ 8 oz t = 248.827 814 4 g
|
| pound (troy) | lb t
| ≡ 5760 grains = 0.373 241 721 6 kg
|
| pound (avoirdupois) | lb av
| ≡ 7000 grains = 0.453 592 37 kg
|
| pound (metric) |
| ≡ 500 g
|
| clove |
| ≡ 8 lb av = 3.628 738 96 kg
|
| stone | st
| ≡ 14 lb av = 6.350 293 18 kg
|
| hyl (MKSA unit) |
| ≡ 1 gee × 1 kg × 1 s²/m = 9.806 65 kg
|
| quarter (Imperial) |
| ≡ 1/4 long cwt = 2 st = 28 lb av = 12.700 586 36 kg
|
| slug; geepound | slug
| ≡ 1 gee × 1 lb av × 1 s²/ft ≈ 14.593 903 kg
|
| bag |
| ≡ 94 lb av = 42.637 682 78 kg
|
| short hundredweight; cental | sh cwt
| ≡ 100 lb av = 45.359 237 kg
|
| long hundredweight (U.S.) or hundredweight (Imperial) | long cwt or cwt
| ≡ 112 lb av = 50.802 345 44 kg
|
| quintal (metric) |
| ≡ 100 kg
|
| wey |
| ≡ 252 lb = 18 st = 114.305 277 24 kg (variants exist)
|
| short quarter (U.S.) |
| ≡ 1/4 sh tn = 226.796 185 kg
|
| long quarter (U.S.) |
| ≡ 1/4 long tn = 254.011 727 2 kg
|
| kip | kip
| ≡ 1000 lb av = 453.592 37 kg
|
| short ton | sh tn
| ≡ 2000 lb = 907.184 74 kg
|
| tonne ( mts unit) | t
| ≡ 1000 kg
|
| long ton (U.S.) or ton (Imperial) | long tn or ton
| ≡ 2240 lb = 1016.046 908 8 kg
|
| barge |
| ≡ 22 1/2 sh tn = 20,411.656 65 kg
|
