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Conversion of units

Encyclopedia : C : CO : CON : Conversion of units

This article lists conversion factors between a number of units of measurement.

Contents

Conversion techniques

The simplest way to convert from one unit to another is to carry through the units themselves in the mathematical operation. To illustrate this process, consider the following examples.

You would like to convert 6 feet into metres. Consulting the table below and finding that one foot is exactly 0.3048 metre, you can now perform the mathematical conversion:

6 ft × 0.3048 m/ft = 1.8288 m
Notice that the "foot" units canceled out, leaving only metres, the desired result. (Since 0.3048 metre per foot have infinite precision, the precision of the answer is determined by the precision of the 6 ft figure; if, for example, you are defining the fathom, expressing it with 5 significant figures is correct. But if the 6 ft figure is a measurement, the result needs to be rounded appropriately.)

Say your height is 183 centimetres, and you wish to convert this into inches:

183 cm / (2.54 cm/in) = 72.0 in
To check our answer, we convert this result back into feet:
72 in / (12 in/ft) = 6.0 feet
which confirms the earlier result.

Multiple units can be manipulated in the same fashion:

7 mi/s × 1.609344 km/mi × 3600 s/h = 40,000 km/h
Thus, Earth escape velocity is about 7 miles per second, or 40,000 kilometres per hour. Notice that since the calculation started with one significant figure (the 7), the answer also has one significant figure (the 4 in 40,000).

Deciding whether to multiply or divide is determined by looking at the units and deciding which ones you want to "get rid" of. In the conversion just above, if we had divided by 3600 s/h instead of multiplying, the result would have come out in kilometre-hours per square second, clearly an incorrect and meaningless result.

See also

Rounding of results

An important thing to remember is that the process of making a conversion cannot give you any more precise results than what you started with. While many of the conversion factors given in the tables below are exact, and others while not exact contain many significant digits, all the numbers you get after performing calculations on a calculator or with pencil and paper are not meaningful.

After using these conversion factors, be sure to round off the results appropriately.

See also

Tables of conversion factors

 Legend
≡ definition
= exactly equal to
≈ approximately equal to
(digits) indicates the digits repeat infinitely

Length

 Length, l
Name of unit Symbol Definition Relation to SI units
metre (SI base unit) m ≡ m = m
fermi fm ≡ 1.000 × 10−15 m = 1.000 × 10−15 m
x unit; siegbahn xu ≈ 1.0021 × 10−13 m
Stigma; pm   ≡ 1.000 × 10−12 m ≡ 1.000 × 10−12 m
Bohr radius a0; b ≡ α/(4πR∞) ≈ 5.291 772 083 × 10−11 ± 19 × 10−20 m
atomic unit of length au ≡ a0 ≈ 5.291 772 083 × 10−11 ± 19 × 10−20 m
ångström Å ≡ 1.000 × 10−10m = 0.1 nm
micron µ, µm ≡ 1.000 × 10−6m
twip twp ≡ 1/1440 in ≈ 1.763 889 × 10−5 m
mil; thou mil ≡ 1.000 × 10−3 in = 2.54 × 10−5 m
mickey   ≡ 1/200 in = 1.27 × 10−4 m
point (ATA) pt ≡ 0.013837 in = 0.351 459 8 mm
point (PostScript) pt ≡ 1/72 in ≈ 0.352 778 mm
point (metric) pt ≡ 3/8 mm = 0.375 mm
point (Didot; European) pt ≡ 0.376 065 mm
line ln ≡ 1/12 in ≈ 2.116 667 mm
barley corn   ≡ 1/3 in ≈ 8.466 667 mm
finger   ≡ 7/8 in = 22.225 mm
inch in ≡ 1/36 yd = 25.4 mm
calibre cal ≡ 1 in = 25.4 mm
stick   ≡ 2 in = 50.8 mm
nail (cloth)   ≡ 2 ¼ in = 57.15 mm
palm   ≡ 3 in = 76.2 mm
hand   ≡ 4 in = 0.1016 m
finger (cloth)   ≡ 4 ½ in = 0.1143 m
span   ≡ 6 in = 0.1524 m
link (Gunter's; Surveyor's) lnk ≡ 1/100 ch = 0.201 168 m
span (cloth)   ≡ 9 in = 0.2286 m
quarter   ≡ ¼ yd = 0.2286 m
link (Ramsden's; Engineer's) lnk ≡ 1 ft = 0.3048 m
foot (Clarke's; Cape) ft (Cla) ≈ 0.304 797 265 4 m
foot (Sear's) ft (Sear) ≈ 0.304 799 47 m
foot (Indian) ft Ind ≈ 0.304 799 514 m
foot (Benoît) ft (Ben) ≈ 0.304 799 735 m
foot ft ≡ 12 in = 0.3048 m
foot (American; U.S. Survey) ft (US) ≡ 1200/3937 m ≈ 0.304 800 610 m
cubit   ≡ 18 in = 0.4572 m
pace   ≡ 2.5 ft = 0.762 m
yard yd ≡ 3 ft = 0.9144 m
ell ell ≡ 45 in = 1.143 m
fathom fm ≡ 6 ft = 1.8288 m
≈ 1/1000 NM = 1.852 m
rod; pole; perch rd ≡ 16 ½ ft = 5.0292 m
rope rope ≡ 20 ft = 6.096 m
chain (Gunter's; Surveyor's) ch ≡ 66 ft = 20.1168 m
chain (Ramsden's; Engineer's) ch ≡ 100 ft = 30.48 m
cable length (International)   ≡ 1/10 NM = 185.2 m
cable length (Imperial)   ≡ 608 ft = 185.3184 m
furlong fur ≡ 660 ft = 201.168 m
cable length (U.S.)   ≡ 720 ft = 219.456 m
mile mi ≡ 1760 yd = 5280 ft = 1609.344 m
mile (U.S. Survey) mi ≡ 5280 ft (US) = 5280 × 1200/3937 m ≈ 1609.347 219 m
nautical mile NM; nm ≡ 1852 m
nautical mile (Admiralty) NM (Adm); nm (Adm) ≡ 6080 ft = 1853.184 m
geographical mile mi ≡ 6082 ft = 1853.7936 m
telegraph mile mi ≡ 6087 ft = 1855.3176 m
league lea ≡ 3 mi = 4828.032 m
nautical league NL; nl ≡ 3 NM = 5556 m
light-second   ≡ 2.997 924 58 × 108 m
light-minute   ≡ 60 light-seconds = 1.798 754 748 × 1010 m
astronomical unit AU = 149 597 870.691 ± 0.030 km
spat S ≡ 1012 m = 1 Tm
light-hour   ≡ 60 light-minutes = 1.079 252 848 8 × 1012 m
light-day   ≡ 24 light-hours = 2.590 206 837 12 × 1013 m
light-year l.y. ≡ c0 × 86 400 × 365.25 = 9.460 730 472 580 8 × 1015 m
parsec pc ≈ 180 × 60 × 60/π AU
≈ 206 264.806 25 AU

3.261 563 776 9 ± 6 × 10−10 light-years

Area

 Area, A
Name of unit Symbol Definition Relation to SI units
square metre (SI unit) m² ≡ 1 m × 1 m
barn b ≡ 10−28 m²
circular mil; circular thou circ mil ≡ π/4 mil² ≈ 5.067 075 × 10−10 m²
square mil; square thou sq mil ≡ 1 mil² = 6.4516 × 10−10 m²
circular inch circ in ≡ π/4 in² ≈ 5.067 075 × 10−4 m²
square inch sq in ≡ 1 in² = 6.4516 × 10−4 m²
board bd ≡ 1 in × 1 ft = 7.741 92 × 10−3 m²
square link sq lnk ≡ 1 lnk² = 4.046 856 422 4 × 10−2 m²
square foot sq ft ≡ 1 ft² = 9.290 304 × 10−2 m²
square yard sq yd ≡ 1 yd² = 0.836 127 36 m²
cord   ≡ 192 bd = 1.486 448 64 m²
boiler horsepower equivalent direct radiation bhp EDR ≡ (1 ft²) (1 bhp) / (240 BTUIT/h) ≈ 12.958 174 m²
square rod/pole/perch sq rd ≡ 1 rd² = 25.292 852 64 m²
are a ≡ 100 m²
square chain sq ch ≡ 1 ch² = 404.685 642 24 m²
dunam   ≡ 1000 m²
rood ro ≡ ¼ ac = 1011.714 105 6 m²
acre ac ≡ 10 sq ch = 4840 sq yd = 4046.856 422 4 m²
hectare ha ≡ 10 000 m² = 0.01 km²
yardland   ≡ 30 ac = 1.214 056 926 72 × 105 m²
hide   ≡ 100 ac = 4.046 856 422 4 × 105 m²
square kilometre km² ≡ 1 km² = 106 m²
square mile; section sq mi ≡ 1 mi² = 2.589 988 110 336 × 106 m²
square U.S. Survey mile sq mi ≡ 1 mi (US)² ≈ 2.589 998 × 106 m²
township   ≡ 36 sq mi (US) ≈ 9.323 994 × 107 m²
barony   ≡ 4000 ac = 1.618 742 568 96 × 107 m²

Volume

 Volume, V
Name of unit Symbol Definition Relation to SI units
cubic metre (SI unit) m³ ≡ 1 m × 1 m × 1 m
litre L ≡ 1 dm³
lambda 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 = 1/8 US tsp = 0.616 115 199 218 75 mL
pinch (Imperial)   ≡ 1/192 gi (Imp) = 1/8 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 ≡ 1/8 fl oz (Imp) = 3.551 632 812 5 mL
fluid dram (U.S.); U.S. fluidram fl dr ≡ 1/8 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   ≡ 1 ½ 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) ≡ 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) ≡ 1/8 gal (US) = 473.176 473 mL
pint (U.S. dry) pt (US dry) ≡ 1/4 bu (US lvl) = 0.550 610 471 357 5 L
pint (Imperial) pt (Imp) ≡ 1/8 gal (Imp) = 0.568 261 25 L
fifth   ≡ 1/5 US gal = 0.757 082 356 8 L
quart (U.S. fluid) qt (US) ≡ 1/4 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
board-foot 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) ≡ 1/8 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
timber foot   ≡ 1 cu ft = 28.316 846 592 L
cubic foot cu ft ≡ 1 ft × 1 ft × 1 ft = 28.316 846 592 L
firkin   ≡ 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
kilderkin   ≡ 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) ≡ 31 ½ gal (US) = 119.240 471 196 L
coomb   ≡ 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
seam   ≡ 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
cord-foot   ≡ 16 cu ft = 0.453 069 545 472 m³
butt, pipe   ≡ 126 gal (wine) = 0.476 961 884 784 m³
perch per ≡ 16 ½ ft × 1 1/2 ft × 1 ft = 0.700 841 953 152 m³
cubic yard cu yd ≡ 27 cu ft = 0.764 554 857 984 m³
tun   ≡ 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
last   ≡ 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
acre-foot   ≡ 1 ac × 1 ft = 1233.481 837 547 52 m³
cubic mile cu mi ≡ 1 mi³ = 4.168 181 825 440 579 584 km³

Angle

 Angle
Name of unit Symbol Definition Relation to SI units
radian (SI unit) rad ≡ 1 rad
centesimal second of arc " ≡ 1 gr/10000 ≈ 1.570 796 µrad
arcsecond " ≡ 1°/3600 ≈ 4.848 137 µrad
centesimal minute of arc ' ≡ 1 gr/100 ≈ 0.157 080 mrad
minute of arc ' ≡ 1°/60 ≈ 0.290 888 mrad
angular mil µ ≡ 2π/6400 rad ≈ 0.981 748 mrad
grad; gradian; gon gr ≡ 2π/400 rad = 0.9° ≈ 15.707 963 mrad
degree (of arc) ° ≡ π/180 rad ≈ 17.453 293 mrad
sign   ≡ 30° ≈ 0.523 599 rad
octant   ≡ 45° ≈ 0.785 398 rad
sextant   ≡ 60° ≈ 1.047 198 rad
quadrant   ≡ 90° ≈ 1.570 796 rad

Solid angle

 Solid angle
Name of unit Symbol Definition Relation to SI units
steradian sr (SI derived unit)

Mass

 Mass, m
Name of unit Symbol Definition Relation to SI units
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 ≡ 1/12 lb 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 (MKS 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 (Portland cement)   ≡ 94 lb av = 42.637 682 78 kg
short hundredweight; cental sh cwt ≡ 100 lb av = 45.359 237 kg
long hundredweight long cwt or cwt ≡ 112 lb av = 50.802 345 44 kg
bag (coffee) ≡ 60 kg = 60 kg
quintal (metric) q ≡ 100 kg
wey   ≡ 252 lb = 18 st = 114.305 277 24 kg (variants exist)
long quarter   ≡ ¼ 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 long tn or ton ≡ 2240 lb = 1016.046 908 8 kg
barge   ≡ 22 ½ sh tn = 20,411.656 65 kg
In physics, the pound of mass is sometimes written lbm to distinguish it from the pound-force (lbf). It should not be read as the mongrel unit "pound metre".

Time

 Time, t
Name of unit Symbol Definition Relation to SI units
second s (SI base unit)
Planck time   ≡ √(Gℏ/c5) ≈ 1.351 211 818 × 10−43 s
atomic unit of time au ≡ a0/(α·c) ≈ 2.418 884 254 × 10−17 s
svedberg S ≡ 10−13 s = 100 fs
shake   ≡ 10−8 s = 10 ns
sigma   ≡ 10−6 s = 1 μs
jiffy   ≡ 1/60 s ≈ 16.666 667 ms
jiffy (alternate)   ≡ 1/100 s ≈ 10 ms
helek   ≡ 1/1080 h ≈ 3.333333 s
minute min ≡ 60 s
moment   ≡ 90 s ≡ 90 s
ke(traditional)   ≡ 1/100 d ≡ 864 s
quarter (of an h) ke ≡ 1/96 d ≡ 900 s
hour h ≡ 60 min = 3600 s
day d ≡ 24 h = 86 400 s
week wk ≡ 7 d = 604 800 s
fortnight   ≡ 2 wk = 1 209 600 s
month (hollow) mo ≡ 29 d = 2 505 600 s
month mo ≡ 30 d = 2 592 000 s
month (full) mo ≡ 31 d = 2 678 400 s
year (Calendar) a or y ≡ 365 d = 31 536 000 s
year (Gregorian) a or y ≡ 365.2425 d = 31 556 952 s
year (Julian) a or y ≡ 365.25 d = 31 557 600 s
sidereal year a or y ≡ 365.256363 d = 31 558 149.76 s
Olympiad   ≡ 4 a of 365 d = 1.2614 × 108 s
lustre; lustrum   ≡ 5 a of 365 d = 1.5768 × 108 s
octaeteris   ≡ 8 a of 365 d = 2.522 88 × 108 s
decade   ≡ 10 a of 365 d = 3.1536 × 108 s
enneadecaeteris; Metonic cycle   ≡ 110 mo (hollow) + 125 mo (full) = 19 a of 365 d = 5.996 16 × 108 s
Callippic cycle   ≡ 441 mo (hollow) + 499 mo (full) = 76 a of 365.25 d = 2.398 377 6 × 109 s
century (Calendar)   ≡ 100 a of 365 d = 3.1536 × 109 s
century (Julian)   ≡ 100 a of 365.25 d = 3.155 76 × 109 s
Hipparchic cycle   ≡ 4 Callippic cycles - 1 d = 9.593 424 × 109 s
millennium (Calendar)   ≡ 1000 a of 365 d = 3.1536 × 1010 s
millennium (Gregorian)   ≡ 1000 a of 365.2425 d = 3.155 695 2 × 1010 s
millennium (Julian)   ≡ 1000 a of 365.25 d = 3.155 76 × 1010 s
Sothic cycle   ≡ 1461 a of 365 d = 4.607 409 6 × 1010 s

Speed

 Speed, v
Name of unit Symbol Definition Relation to SI units
metre per second (SI unit) m/s ≡ 1 m/s
foot per hour fph ≡ 1 ft/h ≈ 8.466 667 × 10−5 m/s
furlong per fortnight   ≡ ½ fur/wk ≈ 1.663 095 × 10−4 m/s
inch per minute ipm ≡ 1 in/min ≈ 4.23 333 × 10−4 m/s
foot per minute fpm ≡ 1 ft/min = 5.08 × 10−3 m/s
inch per second ips ≡ 1 in/s = 2.54 × 10−2 m/s
kilometre per hour km/h ≡ 1 km/h ≈ 2.777 778 × 10−1 m/s
foot per second fps ≡ 1 ft/s = 3.048 × 10−1 m/s
mile per hour mph ≡ 1 mi/h = 0.447 04 m/s
knot kn ≡ 1 NM/h = 1.852 km/h ≈ 0.514 444 m/s
knot (Admiralty) kn ≡ 1 NM (Adm)/h = 1.853 184 km/h ≈ 0.514 773 m/s
mile per minute mpm ≡ 1 mi/min = 26.8224 m/s
mile per second mps ≡ 1 mi/s = 1.609 344 km/s
speed of light in vacuum c ≡ 2.997 924 58 × 108 m/s

Acceleration

 Acceleration, a
Name of unit Symbol Definition Relation to SI units
metre per second squared (SI unit) m/s² ≡ 1 m/s²
foot per hour per second fph/s ≡ 1 ft/h·s ≈ 8.466 667 × 10−5 m/s²
inch per minute per second ipm/s ≡ 1 in/min·s ≈ 4.233 333 × 10−4 m/s²
foot per minute per second fpm/s ≡ 1 ft/min·s = 5.08 × 10−3 m/s²
galileo Gal ≡ 1 cm/s² = 10−2 m/s²
inch per second squared ips² ≡ 1 in/s² = 2.54 × 10−2 m/s²
foot per second squared fps² ≡ 1 ft/s² = 3.048 × 10−1 m/s²
mile per hour per second mph/s ≡ 1 mi/h·s = 4.4704 × 10−1 m/s²
knot per second kn/s ≡ 1 kn/s ≈ 5.144 444 × 10−1 m/s²
standard gravity g ≡ 9.806 65 m/s²
mile per minute per second mpm/s ≡ 1 mi/min·s = 26.8224 m/s²
mile per second squared mps² ≡ 1 mi/s² = 1.609 344 × 10³ m/s²

Force

Pressure

Energy or work

Power

Angular momentum

Electric current

Electric charge

Electromotive force

Electrical resistance

Dynamic viscosity

Kinematic viscosity

Temperature

See also

has more about this subject:

External links

 

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