Table 49. Power Conversion Factors
To Convert ↓ horsepower kilowatts hp (metric) watts kg f -m/s ft-lb f /s ft-lb f /min calories/sec
horsepower
watts
kilowatts 0.745699
hp (metric) 1.0138681 0.0013596 1.3596196 0.0133334 0.0018434 1
kg f -m/s 76.04
ft-lb f /s
ft-lb f /min
calories/sec
Btu/sec 0.7068
Btu/hr 2544.48 3.4122 3412.20 33.4623 4.6263 0.077105 14.2868
550
33000
1
745.699
178.1
0.001
0.00134024 1.34102365 0.9863215 0.01315097
1
0.1019714
0.7375630
44.253727
0.2388363
0.0009478
1000
1
101.9713158 737.563011 44253.727270 238.836025 0.9478344
75
735.499 9.8066
0.735499 0.0098067 0.0013558
542.476857 32548.61114 175.663869 0.6971321 2509.6754
1
7.2330352
433.982114
2.3421883 0.3238181
0.0092951 0.0012851
60
0.00181818 1.35581
0.1382545 0.0023042 0.4269512
1
0.02259 2.2596 3 10 − 5
0.0166667 3.0881527
1
0.0053969 2.1418 3 10 − 5
3.07233 3 10 − 5 0.0056927 1.4344484
3.0303 3 10 − 5
0.00561482 4.18696
0.0041869
185.288916 46689.3039 12.969251
1
0.0039686
252
3600
Btu/sec Btu/hr
1.41482739 1055.035 1.0550353
107.5834748 778.155065
1
0.0003930
0.29306
0.0002931
0.0003985
0.0298843
0.2161542
0.069994
0.0002778
1
Figures in bold face indicate the conversion is exact
Table 50. Energy and Work Conversion Factors
To Convert ↓
joules
ft-lb f
ft-poundal 23.7303
Btu
kg-m
calories
watt-hour
erg
therm
hp-hours
hp-hours (m)
1 3 10 7
joules ft-lb f
1
0.73756
0.0009478 0.101972
0.2388458 0.00027778
9.478 3 10 − 9 3.725 3 10 − 7 3.7764 3 10 − 7
1.355818 0.04214 9.80665 4.1868
1
32.1740 0.00128506 0.138255
0.3238316 0.00037661 1.356 3 10 7 1.285 3 10 − 8 5.0505 3 10 − 7 5.1201 3 10 − 7 0.010065 1.1705 3 10 − 5 4.214 3 10 5 3.994 3 10 − 10 1.5697 3 10 − 8 1.5914 3 10 − 8
ft-poundal
0.03108
1
0.0042971 107.5875
3.994 3 10 − 5
Btu
1055.055 778.1692 25036.8174
1
252
0.29307071 1.055 3 10 10
0.0003930 0.0003984
1 3 10 − 5
kg-m
1
2.342278 0.00272416 9.807 3 10 7 9.294 3 10 − 8 3.653 3 10 − 6 3.703 3 10 − 6
7.233013 232.714987 0.00929524
calories watt-hour
3.088025
99.35427 0.00396832 0.42691934
1
0.001163 4.187 3 10 7 3.968 3 10 − 8 1.5596 3 10 − 6 1.5811 3 10 − 6
3600
2655.2237 85429.168 3.4121416 367.09783 859.845227
1
0.001341
0.0013595
3.6 3 10 10 3.412 3 10 − 5
1 3 10 − 7
1
erg
7.375 3 10 − 8 2.373 3 10 − 6 9.478 3 10 − 11 1.0197 3 10 − 8 2.3884 3 10 − 8 2.778 3 10 − 11
9.478 3 10 − 16 3.725 3 10 − 14 3.776 3 10 − 14
1 3 10 5
therm
29307.222 1.055 3 10 15
1
39.3020
39.843655 1.0137839
1.055 3 10 8 7.781 3 10 7 2.503 3 10 7
1.0758 3 10 7 2.5196 3 10 7
2.6845 3 10 6 1.9799 3 10 6 6.3704 3 10 7 2544.4150 2.7374 3 10 5 6.4118 3 10 5 2.648 3 10 6 1.953 3 10 6 6.2837 3 10 7 2509.8197 2.70 3 10 5 6.3246 3 10 5
745.6944 2.685 3 10 13 0.025444
1
hp-hours
735.555 2.648 3 10 13 0.025098 0.9864034
1
hp-hours (m)
Figures in bold face indicate the conversion is exact
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