Unit conversion Cheat Sheet by [deleted]

Unit name

Symbol

SI conversion

Definition

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]

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

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

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

poise

P

10-1 Pa·s

[≡ 1 barye·s]

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]

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

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]

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]

horsepower

hp

735,5 W

[≡ 75 m·kgf/s]