Conversion Factors of Length

Unit	m	cm	km	in.	ft	mi
1 meter	1	102	10-3	39,37	3,281	6,214 x 10-4
1 centimeter	10-2	1	10-5	0,3937	3,281 x 10-2	6,214 x 10-6
1 kilometer	103	105	1	3,937 x 104	3,281 x 103	0,6214
1 inch (in.)	2,540 x 10-2	2,540	2,540 x 10-5	1	8,333 x 10-2	1,578 x 10-5
1 feet (ft)	0,3048	30,48	3,048 x 10-4	12	1	1,894 x 10-4
1 mile (mi)	1.609	1,609 x 105	1,609	6,336 x 104	5.280	1

Conversion Factors of Mass

Unit	kg	g	slug	u
1 kilogram	1	103	6,852 x 10-2	6,024 x 1026
1 gram	10-3	1	6,852 x 10-5	6,024 x 1023
1 slug (lb/g)	14,59	1,459 x 104	1	8,789 x 1027
1 atomic mass unit (u)	1,660 x 10-27	1,660 x 10-24	1,137 x 10-28	1

Conversion Factors of Time

Unit	s	min	h	day	year
1 second	1	1,667 x 10-2	2,778 x 10-4	1,157 x 10-5	3,169 x 10-8
1 minut	60	1	1,667 x 10-2	6,994 x 10-4	1,901 x 10-6
1 hour	3.600	60	1	4,167 x 10-2	1,141 x 10-4
1 day	8,640 x 104	1.140	24	1	2,738 x 10-3
1 year	3,156 x 107	5,259 x 105	8,766 x 103	365,2	1

Conversion Factors of Speed

Unit	m/s	cm/s	ft/s	mi/h
1 meter/second	1	102	3,281	2,237
1 centimeter/second	10-2	1	3,281 x 10-2	2,237 x 10-2
1 feet/second	0,3048	30,48	1	0,6818
1 mile/hour	0,4470	44,70	1,467	1

Note: 1 mi/min = 60 mi/h = 88 ft/s.

Conversion Factors of Force

Unit	N	dyn	lb
1 newton	1	105	0,2248
1 dina	10-5	1	2,248 x 10-6
1 libra	4,448	4,448 x 105	1

Conversion Factors of Work, Energy, Heat

Unit	J	erg	ft * lb
1 joule	1	107	0,7376
1 erg	10-7	1	7,376 x 10-8
1 ft * lb	1,356	1,356 x 107	1
1 eV	1,602 x 10-19	1,602 x 10-12	1,182 x 10-19
1 cal	4,186	4,186 x 107	3,087
1 Btu	1,055 x 103	1,055 x 1010	7,779 x 102
1 kWh	3,600 x 106	3,600 x 1013	2,655 x 106

Unit	eV	cal	Btu	kWh
1 joule	6,242 x 1018	0,2389	9,481 x 10-4	2,778 x 10-7
1 erg	6,242 x 1013	2,389 x 10-8	9,481 x 10-11	2,778 x 10-7
1 ft * lb	8,464 x 1018	0,3239	1,285 x 10-3	3,766 x 10-7
1 eV	1	3,827 x 10-20	1,519 x 10-22	4,450 x 10--26
1 cal	2,617 x 1019	1	3,968 x 10-3	1,163 x 10-6
1 Btu	6,585 x 1021	2,520 x 102	1	2,930 x 10-4
1 kWh	2,247 x 1025	8,601 x 105	3,413 x 102	1

Conversion Factors of Pressure

Unit	Pa	dyn/cm2	atm
1 pascal	1	10	9,869 x 10-6
1 dina/centimeter2	10-1	1	9,869 x 10-7
1 atmosphere	1,013 x 105	1,013 x 106	1
1 centimeter of quicksilver*	1,333 x 103	1,333 x 104	1,316 x 10-2
1 libra/inch2	6,895 x 103	6,895 x 104	6,805 x 10-2
1 libra/feet2	47,88	4,788 x 102	4,725 x 10-4
Unit	cm Hg	lb/in.2	lb/ft2
1 pascal	7,501 x 10-4	1,450 x 10-4	2,089 x 10-2
1 dina/centimeter2	7,501 x 10-5	1,450 x 10-5	2,089 x 10-3
1 atmosphere	76	14,70	2,116 x 103
1 centimeter of quicksilver*	1	0,1943	27,85
1 libra/inch2	5,171	1	144
1 libra/feet2	3,591 x 10-2	6,944 x 10-3	1

^*At 0^oC and where the gravity's acceleration have it's "normal" value 9,80665 m/s².

The original base text is available at the book Physics: For Scientists and Engineers

Suggestions and grammar corrections on the translation to english and spanish are welcome.