Horsepower is a unit of power that originated in the 18th century, coined by engineer James Watt to compare the output of steam engines with the power of draft horses. A fascinating aspect is the value assigned to this measurement: 1 British horsepower equals approximately 745.7 watts. To put this into perspective, this means that just one horsepower can light up more than ten 60-watt light bulbs!
Interestingly, the unit became widely adopted not for its precision but as a marketing tool. Since people were familiar with the strength of horses in everyday tasks, comparing engine power to horses made industrial power even more relatable and understandable during the Industrial Revolution. Today, horsepower continues to be an essential metric in the automotive and engine industries worldwide, despite its equine origins.
The watt, a unit of power in the International System of Units, is named after James Watt, the Scottish inventor who vastly improved the efficiency of steam engines in the 18th century. One watt is equivalent to one joule of energy per second, signifying how much energy is transferred or converted. Interestingly, a single watt is roughly the amount of power used by a human heart, pumping about 80 milliliters of blood per beat with a resting heart rate.
In our technology-driven society, watts are pivotal in understanding the energy consumption of electrical devices. For instance, a typical LED light bulb uses about 10 watts, significantly less than an incandescent bulb, highlighting the watt’s role in energy conservation. Moreover, the watt powers our world: everything from the brightness of light bulbs to the performance of supercomputers is measured in watts, underlining its importance in both everyday life and cutting-edge technology.
Horsepower (British) | Watts |
---|---|
0
hp
|
0
W
|
10
hp
|
7456.99872
W
|
20
hp
|
14913.99744
W
|
30
hp
|
22370.99616
W
|
40
hp
|
29827.99487
W
|
50
hp
|
37284.99359
W
|
60
hp
|
44741.99231
W
|
70
hp
|
52198.99103
W
|
80
hp
|
59655.98975
W
|
90
hp
|
67112.98847
W
|
100
hp
|
74569.98719
W
|
110
hp
|
82026.9859
W
|
120
hp
|
89483.98462
W
|
130
hp
|
96940.98334
W
|
140
hp
|
104397.98206
W
|
150
hp
|
111854.98078
W
|
160
hp
|
119311.9795
W
|
170
hp
|
126768.97822
W
|
180
hp
|
134225.97694
W
|
190
hp
|
141682.97565
W
|
200
hp
|
149139.97437
W
|
210
hp
|
156596.97309
W
|
220
hp
|
164053.97181
W
|
230
hp
|
171510.97053
W
|
240
hp
|
178967.96925
W
|
250
hp
|
186424.96797
W
|
260
hp
|
193881.96668
W
|
270
hp
|
201338.9654
W
|
280
hp
|
208795.96412
W
|
290
hp
|
216252.96284
W
|
300
hp
|
223709.96156
W
|
310
hp
|
231166.96028
W
|
320
hp
|
238623.959
W
|
330
hp
|
246080.95771
W
|
340
hp
|
253537.95643
W
|
350
hp
|
260994.95515
W
|
360
hp
|
268451.95387
W
|
370
hp
|
275908.95259
W
|
380
hp
|
283365.95131
W
|
390
hp
|
290822.95003
W
|
400
hp
|
298279.94875
W
|
410
hp
|
305736.94746
W
|
420
hp
|
313193.94618
W
|
430
hp
|
320650.9449
W
|
440
hp
|
328107.94362
W
|
450
hp
|
335564.94234
W
|
460
hp
|
343021.94106
W
|
470
hp
|
350478.93978
W
|
480
hp
|
357935.93849
W
|
490
hp
|
365392.93721
W
|
500
hp
|
372849.93593
W
|
510
hp
|
380306.93465
W
|
520
hp
|
387763.93337
W
|
530
hp
|
395220.93209
W
|
540
hp
|
402677.93081
W
|
550
hp
|
410134.92952
W
|
560
hp
|
417591.92824
W
|
570
hp
|
425048.92696
W
|
580
hp
|
432505.92568
W
|
590
hp
|
439962.9244
W
|
600
hp
|
447419.92312
W
|
610
hp
|
454876.92184
W
|
620
hp
|
462333.92055
W
|
630
hp
|
469790.91927
W
|
640
hp
|
477247.91799
W
|
650
hp
|
484704.91671
W
|
660
hp
|
492161.91543
W
|
670
hp
|
499618.91415
W
|
680
hp
|
507075.91287
W
|
690
hp
|
514532.91159
W
|
700
hp
|
521989.9103
W
|
710
hp
|
529446.90902
W
|
720
hp
|
536903.90774
W
|
730
hp
|
544360.90646
W
|
740
hp
|
551817.90518
W
|
750
hp
|
559274.9039
W
|
760
hp
|
566731.90262
W
|
770
hp
|
574188.90133
W
|
780
hp
|
581645.90005
W
|
790
hp
|
589102.89877
W
|
800
hp
|
596559.89749
W
|
810
hp
|
604016.89621
W
|
820
hp
|
611473.89493
W
|
830
hp
|
618930.89365
W
|
840
hp
|
626387.89236
W
|
850
hp
|
633844.89108
W
|
860
hp
|
641301.8898
W
|
870
hp
|
648758.88852
W
|
880
hp
|
656215.88724
W
|
890
hp
|
663672.88596
W
|
900
hp
|
671129.88468
W
|
910
hp
|
678586.88339
W
|
920
hp
|
686043.88211
W
|
930
hp
|
693500.88083
W
|
940
hp
|
700957.87955
W
|
950
hp
|
708414.87827
W
|
960
hp
|
715871.87699
W
|
970
hp
|
723328.87571
W
|
980
hp
|
730785.87443
W
|
990
hp
|
738242.87314
W
|
1000
hp
|
745699.87186
W
|
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