Unit Conversion Factors

Note:  En = 10n, e.g., E5=105, E-5=10-5.
 

 Mass

  g oz lb kg cwt US ton t (ton) UK ton
g 1 oz 2.205E-3 kg        
oz 28.350 0.03527 0.0625 0.02835        
Ib 453.592 1 1 0.45359 8.929E-3 5.00E-4 4.536E-4 4.464E-4
kg 1E3 16 2.20462 1 0.01968 1.102E-3 1E-3 9.842E-4
cwt 50802.3 35.274 112 50.802 1 0.056 0.05080 0.05
US ton 907185 1792 2000 907.185 17.857 1 0.90719 0.892857
US ton 1E6 32 000 2204.62 1000 19.684 1.1023 1 0984207
t ( tonne ) 1.016E6 35273.9 2 240 1016.05 20 1.12 1.01605 1

  1 quintal = 100 kg
  t = tonne (1000 kg)
  ton must be spelled in full with U.S. or U.K. indicated 

 Density (mass/volume)

→ kg/m3 Ib/ft3 Ib/US gal g/cm3* US ton/yd3 Ib/in3
kg/m3 1 0.06243 8.345E-3 1E-3 8.427E-4 3.605E-5
Ib/ft3 16.019 1 0.13369 0.016 019 0.0135 5.787E-4
lb/US gal 119.83 7.4805 1 0.11983 0.1010 4.329E-3
g/cm3* 1000 62.428 8.3457 1 0.8427 0.03613
US ton/yd3 1186.55 62.428 9.902 1.18655 1 0.04287
Ib/in3 27679.9 1728 231.007 27.680 23.326 1

  1 g/cm3 = 1 kg/dm3 = 1 t/m3 = 1.000028 g/ml or 1.000028 kg/litre (1901 definition of the litre)

 Mass Rate of Flow (mass/time)

→ t/y lb/hr kg/hr g/s lb/min t/d t/h lb/s kg/s
t/y 1 0.2516 0.1142 0.0317 4.194E-3 2.740E-3 1.142E-4 6.990E-5 3.171E-5
lb/hr 3.975 1 0.4536 0.1260 0.01667 0.01089 4.536E-4 2.778E-4 1.260E-4
kg/hr 8.760 2.205 1 0.2778 0.03674 0.02400 *1E-3 6.124E-4 2.778E-4
g/s 31.54 7.937 *3.6 1 0.1323 0.08640 *3.6E-3 2.205E-3 1E-3
lb/min 238.5 *60 27.216 7.560 1 0.653 2.722E-2 1.667E-2 7.560E-3
t/d 365 91.86 41.67 11.57 1.531 1 0.04167 0.02551 0.01157
t/h 8760 2205 1000 277.8 36.74 *24 1 0.6124 0.2778
lb/s 14304 *3600 1633 453.6 *60 39.19 1.633 1 0.4536
kg/s 31536 7937 3600 1000 132.3 86.40 *3.6 2.205 1

  Pressure

→ Pa lbf/ft2 mm Hg
@ 0°C		 lbf/in2
(psi)		 *kgf/cm2 N/mm2 bar atm
Pa 1 0.02089 7.501 E-3 1.450E-4 1.020E-5 1.000 E-6 1.000E-5 9.869E-6
lbf/ft2 47.88 1 0.359 1 6.944E-3 4.882E-4 4.789 E-5 4.788E-4 4.726E-4
mm Hg  
@ 0°C		 133.3 2.785 1 0.019 34 1.360E-3 1.333 E-4 1.333E-3 1.316E-3
lbf/in2
(psi)		 6895 144 51.71 1 0.070 31 6.897 E-3 0.068 95 0.06805
kgf/cm2 9.807E4 2 048 735.6 14.22 1 9.804 E-2 0.980 7 0.967 8
N/mm2 1.000E6 2.088E4 7.501E3 145.0  10.20 1 10.00 9.868
bar 1.000E5 2 089 750.1 14.50 1.020 0.100 1 0.986 9
atm 1.013E5 2 116 760.0 14.70 1.033 1.013 E-1 1.013 1

  1 litre = 1.000 028 dm3 and 1 ml = 1.000 028 cm3 according to the 1901 definition of the litre
  * 1 kgf/cm2= I kp/cm2= I technical atmosphere 
  1 torr = 1 mm Hg (to within 1 part in 7 million)
  1 Pa = I N/m2
  1 dyn/cm2=0.100Pa
  1 in H2O @ 32° F = 249.1Pa
  1 in Hg @60° F =3376Pa  

 Energy

→ J ft lbf cal kgf m Btu Chu Φhp h kWh therm
J 1 0.737 6 0.238 8 0.102 0 9.478E-4 5.266E-4 3.725E-7 2.778E-7 9.478E-9
ft lbf 1.355 8 1 0.323 8 0.138 3 1.285E-3 7.139E-4 5.051E-7 3.766E-7 1.285E-8
cal 4.186 8 3.088 0 1 0.427 0 3.968E-3 2.205E-3 1.560E-6 1.163E-6 3.968E-8
kgf m 9.806 6 7.233 0 2.342 0 1 9.294E-3 5.163E-3 3.653E-6 2.742E-6 9.294E-8
Btu 1 055.1 778.17 252.00 107.59 1 0.555 6 3.930E-4 2.931 E-4 1E-5
Chu 1 899.1 1 400.7 453.59 193.71 1.800 1 7.074E-4 5.275E-4 1.800E-5
Φhp h 2.685E6 1.980E6 641 186 273 745 2 544.4 1 413.6 1 0.745 7 0.254 4
k W h 3.600E6 2.655E5 859 845 367 098 3 412.1 1 895.6 1.341 0 1 0.034 12
therm 1.055E8 7.782E7 2.520E7 1.0759E7 100 000 55 556 39.301 29.307 1

  Φ 1hph = 1.014 hp h (metric)= 745.7 Wh = 2.685 MJ
  1 thermie = 1.163 k Wh = 4.186 MJ = 999.7 kcal
  1 lft pd] = 0.042 14J
  1 erg = 1E-7 J