This page may be
updated as we encounter new units.
Common unit conversions (such as 1 yard = 3 feet, or 1 day = 24 hours)
will not appear here.
Distance 
1 m = 3.281 ft 


1 mi = 1609 m 


1 mi = 5280 ft 


1 m = 100 cm 


1 m = 1000 mm 


1 km = 1000 m 




Force 
1 lb = 4.448 N 1 lb = 7000 grains 




Power 
1 Hp = 550 ftlb/s 


1 Hp = 746 W 


1 W = 1 J/s 




Speed 
1 m/s = 2.237 mph 




Weight and mass 
1 kg weighs 9.8 N 1 kg weighs 2.203 lb 1 kg = 1000 g 
(a kilogram is the mass of
1 liter of water) 

1 u = 1.6605 x 10^{27} kg 


1 gram = 15.432358 grains 




Volume 
1000 ml = 1 l 


1 ml = 1 cm^{3} 


1 ft^{3} = 7.481 gal 


1 gal = 3.786 l 


1 l = 10 cm x 10 cm x 10 cm 
(a
liter is the volume of a cube that has sides of length 0.10 meters) 



Energy 
1 J = 1 Nm = 0.738 ft^{.}lb 


1 cal = 4.186 J 


1 


1 BTU = 252 cal 




Pressure 
1 Pa = 1 N/m^{2 }= 1.45 x 10^{4} psi 


1 kPa = 1000 Pa 


1 atm = 14.7 psi = 101.3 kPa 


760 mm Hg = 1 atm 
Blood pressure is measured in units of mm Hg
(millimeters of Mercury – the pressure required to raise Mercury so many mm
in a tube). So if a person’s systolic
pressure is “140” that is 140 mm Hg). 



Temperature 
100 K = 180 R 


Celsius = K – 273 
Celsius & Fahrenheit are not true temperature
units. 

Fahrenheit = R  460 




Activity of Radioactive
material 
1 Bq = 1 decay/sec 




Time 
1 year = 3.156 x 10^{7} sec 1 year = 31,560,000 sec 

Charge 
1 C = 6.24151 x 10^{18} e 




Angle 
1 Revolution = 360^{o} 
2p “radians” is just 2p because radians are a dimensionless ratio, not a regular unit. 

1 Revolution = 2p 


1 Revolution = 400 Grad 






