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Unit conversion Cheat Sheet by [deleted]

Gathering of some common non SI-based measurement units

Physical quantity

Unit name
Symbol
SI conver­sion
Defi­nit­ion

Length units

inch
in
2,54 cm
[≡ 1/36 yd]
foot
ft
30,48 cm
[≡ 12 in]
yard
yd
0,9144 m
[≡ 3 ft]
mile
mi
1609,34 m
[≡ 5280 ft]
nautic mile
nm; NM
1852 m
[≡ 6080 ft]
league
lea
4828,03 m
[≡ 3 mi]

Area units

are
a
100 m2
[≡ 100 m2]
acre
ac
4046,86 m2
[≡ 4840 sq yd]
hectare
ha
10000 m2
[≡ 10000 m2]

Volume units

tablespoon
tbsp
15 mL
[≡ 15 mL]
pint
pt
0,568 L
[≡ 1/8 gal]
gallon
gal
4,546 L
[≡ 4,546 L]

Speed units

mile per hour
mph
0,447 m/s
[≡ ​1 mi/h]
knot
kn
0,514 m/s
[≡ ​1 NM/h]

Dynamic viscosity units

poise
P
10-1 Pa·s
[≡ 1 barye·s]
 

Mass units

carat
kt
200 mg
[≡ ​200 mg]
ounce (avoir­dupois)
oz av
28,35 g
[≡ ​1/16 lb]
pound (avoir­dupois)
lb av
0,45 kg
[≡ ​7000 grains]

Force units

dyne
dyn
10-5 N
[≡ ​1 g·cm/s2]
kilogr­am-­force
kgf; kp
9,81 N
[≡ 1 kg x g]

Pressure units

torr
torr
133,32 Pa
[≡ 101325/760 Pa]
millimeter of mercury
mmHg
133,32 Pa
[≡ ...]
pound per square inch
psi
6,894 x 103 Pa
[≡ 1 lbf/in2]

Energy units

erg
erg
10-7 J
[≡ 1 g⋅cm/s2]
British thermal unit
BTU
1,055 kJ
[≡ ...]
ton of TNT
tTNT
4,184 GJ
[≡ 1 Gcal]

Power units

horsepower
hp
735,5 W
[≡ 75 m·kgf/s]

Temper­ature units

kelvin
K
T[K] = T[°C] + 273,15
degree Celsius
°C
T[°C] = T[K] - 273,15
degree Rankine
°R; °Ra
T[°R] = 9/5 x T[K]
degree Fahrenheit
°F
T[°F] = 9/5 x T[°C] + 32
               

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