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Legend |
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≡ |
definition |
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= |
exactly equal to |
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≈ |
approximately equal to |
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(digits) |
indicates the digits repeat infinitely |
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Length, l |
|||
|
Name of unit |
Symbol |
Definition |
Relation to SI units |
|
Å |
|
≡ 1.000×10−10 m = 0.1 nm |
|
|
AU |
Mean distance from Earth to the Sun |
= 149 597 870.691 ± 0.030 km |
|
|
au |
≡ a0 |
≈ 5.291 772 083×10−11 ± 19×10−20 m |
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barley corn |
|
≡ 1/3 in |
≈ 8.466 667 mm |
|
a0; b |
≈ 5.291 772 083×10−11 ± 19×10−20 m |
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cable length (Imperial) |
|
≡ 608 ft |
= 185.3184 m |
|
cable length (International) |
|
≡ 1/10 NM |
= 185.2 m |
|
cable length (U.S.) |
|
≡ 720 ft |
= 219.456 m |
|
calibre |
cal |
≡ 1 in |
= 25.4 mm |
|
ch |
≡ 66 ft |
= 20.1168 m |
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|
ch |
≡ 100 ft |
= 30.48 m |
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cubit |
|
≡ 18 in |
= 0.4572 m |
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ell |
ell |
≡ 45 in |
= 1.143 m |
|
fm |
≡ 6 ft |
= 1.8288 m |
|
|
≈ 1/1000 NM |
= 1.852 m |
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fm |
≡ 1.000×10−15 m |
= 1.000×10−15 m |
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finger |
|
≡ 7/8 in |
= 22.225 mm |
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finger (cloth) |
|
≡ 4 ½ in |
= 0.1143 m |
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foot (Benoît) |
ft (Ben) |
|
≈ 0.304 799 735 m |
|
foot (Clarke's; Cape) |
ft (Cla) |
|
≈ 0.304 797 265 4 m |
|
foot (Indian) |
ft Ind |
|
≈ 0.304 799 514 m |
|
foot (International) |
ft |
≡ 1/3 yd |
= 0.3048 m |
|
foot (Sear's) |
ft (Sear) |
|
≈ 0.304 799 47 m |
|
foot (U.S. Survey) |
ft (US) |
≡ 1200/3937 m [1] |
≈ 0.304 800 610 m |
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fur |
≡ 660 ft |
= 201.168 m |
|
|
mi |
≡ 6082 ft |
= 1853.7936 m |
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hand |
|
≡ 4 in |
= 0.1016 m |
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in |
≡ 1/36 yd |
= 25.4 mm |
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lea |
≡ 3 mi |
= 4828.032 m |
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|
|
≡ 24 light-hours |
= 2.590 206 837 12×1013 m |
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|
|
≡ 60 light-minutes |
= 1.079 252 848 8×1012 m |
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|
|
≡ 60 light-seconds |
= 1.798 754 748×1010 m |
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|
|
≡ 2.997 924 58×108 m |
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l.y. |
≡ c0 × 86 400 × 365.25 |
= 9.460 730 472 580 8×1015 m |
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line |
ln |
≡ 1/12 in (Klein 1988, 63) |
≈ 2.116 667 mm |
|
link (Gunter's; Surveyor's) |
lnk |
≡ 1/100 ch |
= 0.201 168 m |
|
link (Ramsden's; Engineer's) |
lnk |
≡ 1 ft |
= 0.3048 m |
|
m |
≡ 1 m |
= 1 m |
|
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mickey |
|
≡ 1/200 in |
= 1.27×10−4 m |
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µ |
|
≡ 1.000×10−6 m |
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mil; thou |
mil |
≡ 1.000×10−3 in |
= 2.54×10−5 m |
|
mi |
≡ 1760 yd = 5280 ft |
= 1609.344 m |
|
|
mile (U.S. Survey) |
mi |
≡ 5280 ft (US) |
= 5280 × 1200/3937 m ≈ 1609.347 219 m |
|
nail (cloth) |
|
≡ 2 ¼ in |
= 57.15 mm |
|
nautical league |
NL; nl |
≡ 3 NM |
= 5556 m |
|
NM; nm |
|
≡ 1852 m |
|
|
nautical mile (Admiralty) |
NM (Adm); nm (Adm) |
≡ 6080 ft |
= 1853.184 m |
|
pace |
|
≡ 2.5 ft |
= 0.762 m |
|
palm |
|
≡ 3 in |
= 76.2 mm |
|
pc |
≈ 180 × 60 × 60/π AU ≈ 206 264.806 25 AU |
= 3.085 677 581 3×1016 ± 6×106 m |
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point (ATA) |
pt |
≡ 0.013837 in |
= 0.351 459 8 mm |
|
point (Didot; European) |
pt |
|
≡ 0.376 065 mm |
|
point (metric) |
pt |
≡ 3/8 mm |
= 0.375 mm |
|
point (PostScript) |
pt |
≡ 1/72 in |
≈ 0.352 778 mm |
|
quarter |
|
≡ ¼ yd |
= 0.2286 m |
|
rod; pole; perch |
rd |
≡ 16 ½ ft |
= 5.0292 m |
|
rope |
rope |
≡ 20 ft |
= 6.096 m |
|
span |
|
≡ 6 in |
= 0.1524 m |
|
span (cloth) |
|
≡ 9 in |
= 0.2286 m |
|
spat[citation needed] |
S |
≡ 1012 m |
= 1 Tm |
|
stick |
|
≡ 2 in |
= 50.8 mm |
|
stigma; pm |
|
≡ 1.000×10−12 m |
≡ 1.000×10−12 m |
|
telegraph mile |
mi |
≡ 6087 ft |
= 1855.3176 m |
|
twp |
≡ 1/1440 in |
≈ 1.763 889×10−5 m |
|
|
xu |
|
≈ 1.0021×10−13 m |
|
|
yard (International) |
yd |
≡3 ft ≡ 0.9144 m [1] |
= 0.9144 m |
|
Area, A |
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|
Name of unit |
Symbol |
Definition |
Relation to SI units |
|
ac |
≡ 10 sq ch = 4840 sq yd |
= 4046.856 422 4 m² |
|
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a |
|
≡ 100 m² |
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|
b |
|
≡ 10−28 m² |
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|
barony |
|
≡ 4000 ac |
= 1.618 742 568 96×107 m² |
|
board |
bd |
≡ 1 in × 1 ft |
= 7.741 92×10−3 m² |
|
boiler horsepower equivalent direct radiation |
bhp EDR |
≡ (1 ft²) (1 bhp) / (240 BTUIT/h) |
≈ 12.958 174 m² |
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circular inch |
circ in |
≡ π/4 in² |
≈ 5.067 075×10−4 m² |
|
circular mil; circular thou |
circ mil |
≡ π/4 mil² |
≈ 5.067 075×10−10 m² |
|
cord |
|
≡ 192 bd |
= 1.486 448 64 m² |
|
|
≡ 1000 m² |
= 1000 m² |
|
|
ha |
≡ 10 000 m² |
= 0.01 km² |
|
|
|
≡ 100 ac |
= 4.046 856 422 4×105 m² |
|
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rood |
ro |
≡ ¼ ac |
= 1011.714 105 6 m² |
|
square chain |
sq ch |
≡ 1 ch² |
= 404.685 642 24 m² |
|
sq ft |
≡ 1 ft² |
= 9.290 304×10−2 m² |
|
|
sq in |
≡ 1 in² |
= 6.4516×10−4 m² |
|
|
km² |
≡ 1 km² |
= 106 m² |
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square link |
sq lnk |
≡ 1 lnk² |
= 4.046 856 422 4×10−2 m² |
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square metre (SI unit) |
m² |
≡ 1 m × 1 m |
= 1 m² |
|
square mil; square thou |
sq mil |
≡ 1 mil² |
= 6.4516×10−10 m² |
|
square mile; section |
sq mi |
≡ 1 mi² |
= 2.589 988 110 336×106 m² |
|
square rod/pole/perch |
sq rd |
≡ 1 rd² |
= 25.292 852 64 m² |
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square U.S. Survey mile |
sq mi |
≡ 1 mi (US)² |
≈ 2.589 998×106 m² |
|
sq yd |
≡ 1 yd² |
= 0.836 127 36 m² |
|
|
|
≡ 1000 m² |
= 1000 m² |
|
|
|
≡ 36 sq mi (US) |
≈ 9.323 994×107 m² |
|
|
yardland |
|
≡ 30 ac |
= 1.214 056 926 72×105 m² |
|
Volume, V |
|||
|
Name of unit |
Symbol |
Definition |
Relation to SI units |
|
cubic metre (SI unit) |
m³ |
≡ 1 m × 1 m × 1 m |
|
|
L |
|
≡ 1 dm³ |
|
|
λ |
≡ 1 mm³ |
= 1 μL |
|
|
drop (metric) |
|
≡ 1/20 mL |
= 0.05 mL |
|
minim (Imperial) |
min |
≡ 1/480 fl oz (Imp) = 1/60 fl dr (Imp) |
≈ 0.059 193 880 208 333 mL |
|
minim (U.S.) |
min |
≡ 1/480 US fl oz = 1/60 US fl dr |
= 0.061 611 519 921 875 mL |
|
drop (U.S.) (alt) |
gtt |
≡ 1/456 US fl oz |
≈ 0.064 854 231 mL |
|
drop (Imperial) (alt) |
gtt |
≡ 1/1824 gi (Imp) |
≈ 0.077 886 684 mL |
|
drop (U.S.) |
gtt |
≡ 1/360 US fl oz |
= 0.082 148 693 229 1(6) mL |
|
drop (medical) |
|
≡ 1/12 mL |
= 0.08(3) mL |
|
drop (Imperial) |
gtt |
≡ 1/288 fl oz (Imp) |
= 0.098 656 467 013 (8) mL |
|
dash (U.S.) |
|
≡ 1/96 US fl oz = ½ US pinch |
= 0.308 057 599 609 375 mL |
|
dash (Imperial) |
|
≡ 1/384 gi (Imp) = ½ pinch (Imp) |
= 0.369 961 751 302 08(3) mL |
|
pinch (U.S.) |
|
≡ 1/48 US fl oz = ⅛ US tsp |
= 0.616 115 199 218 75 mL |
|
pinch (Imperial) |
|
≡ 1/192 gi (Imp) = ⅛ tsp (Imp) |
= 0.739 923 502 604 1(6) mL |
|
fluid scruple (Imperial) |
fl s |
≡ 1/24 fl oz (Imp) |
= 1.183 877 604 1(6) mL |
|
fluid drachm (Imperial) |
fl dr |
≡ ⅛ fl oz (Imp) |
= 3.551 632 812 5 mL |
|
fluid dram (U.S.); U.S. fluidram |
fl dr |
≡ ⅛ US fl oz |
= 3.696 691 195 312 5 mL |
|
teaspoon (Canadian) |
tsp |
≡ 1/6 fl oz (Imp) |
≈ 4.735 510 416 667 mL |
|
teaspoon (U.S.) |
tsp |
≡ 1/6 US fl oz |
= 4.928 921 595 mL |
|
teaspoon (metric) |
|
|
≡ 5 mL |
|
teaspoon (Imperial) |
tsp |
≡ 1/24 gi (Imp) |
= 5.919 388 020 8(3) mL |
|
dessertspoon (Imperial) |
|
≡ 1/12 gi (Imp) |
= 11.838 776 041 (6) mL |
|
tablespoon (Canadian) |
tbsp |
≡ ½ fl oz (Imp) |
= 14.206 531 25 mL |
|
tablespoon (U.S.) |
tbsp |
≡ ½ US fl oz |
= 14.786 764 782 5 mL |
|
tablespoon (metric) |
|
|
≡ 15 mL |
|
cubic inch |
cu in |
≡ 1 in³ |
= 16.387 064 mL |
|
tablespoon (Imperial) |
tbsp |
≡ 5/8 fl oz (Imp) |
= 17.758 164 062 5 mL |
|
pony |
|
≡ 3/4 US fl oz |
= 22.180 147 171 875 mL |
|
fluid ounce (Imperial) |
fl oz (Imp) |
≡ 1/160 gal (Imp) |
= 28.413 062 5 mL |
|
fluid ounce (U.S.) |
fl oz (US) |
≡ 1/128 gal (US) |
= 29.573 529 562 5 mL |
|
shot |
|
≡ 1 US fl oz |
= 29.573 529 562 5 mL |
|
jigger |
|
≡ 1½ US fl oz |
= 44.360 294 343 75 mL |
|
gill (U.S.) |
gi (US) |
≡ 4 US fl oz |
= 118.294 118 25 mL |
|
gill (Imperial); Noggin |
gi (Imp); nog |
≡ 5 fl oz (Imp) |
= 142.065 312 5 mL |
|
cup (Canadian) |
c (CA) |
≡ 8 fl oz (Imp) |
= 227.3045 mL |
|
cup (U.S.) |
c (US) |
≡ 8 US fl oz ≡ 1/16 gal (US) |
= 236.588 236 5 mL |
|
cup (metric) |
c |
|
≡ 250 mL |
|
breakfast cup |
|
≡ 10 fl oz (Imp) |
= 284.130 625 mL |
|
pint (U.S. fluid) |
pt (US fl) |
≡ ⅛ gal (US) |
= 473.176 473 mL |
|
pint (U.S. dry) |
pt (US dry) |
≡ 1/64 bu (US lvl) ≡ ⅛ gal (US dry) |
= 0.550 610 471 357 5 L |
|
pint (Imperial) |
pt (Imp) |
≡ ⅛ gal (Imp) |
= 0.568 261 25 L |
|
fifth |
|
≡ 1/5 US gal |
= 0.757 082 356 8 L |
|
quart (U.S. fluid) |
qt (US) |
≡ ¼ gal (US fl) |
= 0.946 352 946 L |
|
quart (U.S. dry) |
qt (US) |
≡ 1/32 bu (US lvl) = ¼ gal (US dry) |
= 1.101 220 942 715 L |
|
quart (Imperial) |
qt (Imp) |
≡ ¼ gal (Imp) |
= 1.136 522 5 L |
|
pottle; quartern |
|
≡ ½ gal (Imp) = 80 fl oz (Imp) |
= 2.273 045 L |
|
fbm |
≡ 144 cu in |
= 2.359 737 216 L |
|
|
gallon (U.S. fluid; Wine) |
gal (US) |
≡ 231 cu in |
= 3.785 411 784 L |
|
gallon (U.S. dry) |
gal (US) |
≡ ⅛ bu (US lvl) |
= 4.404 883 770 86 L |
|
gallon (Imperial) |
gal (Imp) |
≡ |
= 4.546 09 L |
|
beer gallon |
beer gal |
≡ 282 cu in |
= 4.621 152 048 L |
|
peck (U.S. dry) |
pk |
≡ ¼ US lvl bu |
= 8.809 767 541 72 L |
|
peck (Imperial) |
pk |
≡ 2 gal (Imp) |
= 9.092 18 L |
|
bucket (Imperial) |
bkt |
≡ 4 gal (Imp) |
= 18.184 36 L |
|
|
≡ 1 cu ft |
= 28.316 846 592 L |
|
|
cu ft |
≡ 1 ft × 1 ft × 1 ft |
= 28.316 846 592 L |
|
|
|
≡ 9 gal (US) |
= 34.068 706 056 L |
|
|
bushel (U.S. dry level) |
bu (US lvl) |
≡ 2150.42 cu in |
= 35.239 070 166 88 L |
|
bushel (Imperial) |
bu (Imp) |
≡ 8 gal (Imp) |
= 36.368 72 L |
|
bushel (U.S. dry heaped) |
bu (US) |
≡ 1 ¼ bu (US lvl) |
= 44.048 837 708 6 L |
|
strike (U.S.) |
|
≡ 2 bu (US lvl) |
= 70.478 140 333 76 L |
|
strike (Imperial) |
|
≡ 2 bu (Imp) |
= 72.737 44 L |
|
|
≡ 18 gal (Imp) |
= 81.829 62 L |
|
|
sack (U.S.) |
|
≡ 3 bu (US lvl) |
= 105.717 210 500 64 L |
|
sack (Imperial); bag |
|
≡ 3 bu (Imp) |
= 109.106 16 L |
|
barrel (U.S. dry) |
bl (US) |
≡ 105 qt (US) = 105/32 bu (US lvl) |
= 115.628 198 985 075 L |
|
barrel (U.S. fluid) |
fl bl (US) |
≡ 31½ gal (US) |
= 119.240 471 196 L |
|
|
≡ 4 bu (Imp) |
= 145.474 88 L |
|
|
barrel (petroleum) |
bl |
≡ 42 gal (US) |
= 158.987 294 928 L |
|
barrel (Imperial) |
bl (Imp) |
≡ 36 gal (Imp) |
= 163.659 24 L |
|
hogshead (U.S.) |
hhd (US) |
≡ 2 fl bl (US) |
= 238.480 942 392 L |
|
|
≡ 8 bu (US lvl) |
= 281.912 561 335 04 L |
|
|
quarter; pail |
|
≡ 8 bu (Imp) |
= 290.949 76 L |
|
hogshead (Imperial) |
hhd (Imp) |
≡ 2 bl (Imp) |
= 327.318 48 L |
|
|
≡ 16 cu ft |
= 0.453 069 545 472 m³ |
|
|
butt, pipe |
|
≡ 126 gal (wine) |
= 0.476 961 884 784 m³ |
|
per |
≡ 16½ ft × 1½ ft × 1 ft |
= 0.700 841 953 152 m³ |
|
|
cubic yard |
cu yd |
≡ 27 cu ft |
= 0.764 554 857 984 m³ |
|
|
≡ 252 gal (wine) |
= 0.953 923 769 568 m³ |
|
|
displacement ton |
|
≡ 35 cu ft |
= 0.991 089 630 72 m³ |
|
water ton |
|
≡ 28 bu (Imp) |
= 1.018 324 16 m³ |
|
freight ton |
|
≡ 40 cu ft |
= 1.132 673 863 68 m³ |
|
wey (U.S.) |
|
≡ 40 bu (US lvl) |
= 1.409 562 806 675 2 m³ |
|
load |
|
≡ 50 cu ft |
= 1.415 842 329 6 m³ |
|
register ton |
|
≡ 100 cu ft |
= 2.831 684 659 2 m³ |
|
|
≡ 80 bu (Imp) |
= 2.909 497 6 m³ |
|
|
cord (firewood) |
|
≡ 8 ft × 4 ft × 4 ft |
= 3.624 556 363 776 m³ |
|
cubic fathom |
cu fm |
≡ 1 fm × 1 fm × 1 fm |
= 6.116 438 863 872 m³ |
|
acre-inch |
|
≡ 1 ac × 1 in |
= 102.790 153 128 96 m³ |
|
|
≡ 1 ac × 1 ft |
= 1233.481 837 547 52 m³ |
|
|
cubic mile |
cu mi |
≡ 1 mi³ |
= 4.168 181 825 440 579 584 km³ |
|
Name of unit |
Symbol |
Definition |
Relation to SI units |
|
radian (SI unit) |
rad |
|
≡ 1 rad |
|
" |
≡ 1 gr/10000 |
≈ 1.570 796 µrad |
|
|
" |
≡ 1°/3600 |
≈ 4.848 137 µrad |
|
|
' |
≡ 1 gr/100 |
≈ 0.157 080 mrad |
|
|
' |
≡ 1°/60 |
≈ 0.290 888 mrad |
|
|
µ |
≡ 2π/6400 rad |
≈ 0.981 748 mrad |
|
|
gr |
≡ 2π/400 rad = 0.9° |
≈ 15.707 963 mrad |
|
|
° |
≡ π/180 rad |
≈ 17.453 293 mrad |
|
|
sign |
|
≡ 30° |
≈ 0.523 599 rad |
|
|
≡ 45° |
≈ 0.785 398 rad |
|
|
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& | ||