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.
Horsepower (metric) is a fascinating unit of measurement that dates back to the 18th century, when James Watt, the developer of the steam engine, sought to compare the power output of his engines to that of draft horses. The metric horsepower is defined as the amount of power required to lift a 75-kilogram mass one meter vertically in one second, which is equivalent to 735.5 watts. Interestingly, this unit persists in many regions, particularly in the automotive industry, where it is used to convey the strength of vehicle engines. Despite advancements in engine technology, the image of raw horsepower continues to captivate our imagination, embodying both history and precision engineering.
Horsepower (British) | Horsepower (metric) |
---|---|
0
hp
|
0
PS
|
10
hp
|
10.1387
PS
|
20
hp
|
20.27739
PS
|
30
hp
|
30.41609
PS
|
40
hp
|
40.55479
PS
|
50
hp
|
50.69348
PS
|
60
hp
|
60.83218
PS
|
70
hp
|
70.97088
PS
|
80
hp
|
81.10957
PS
|
90
hp
|
91.24827
PS
|
100
hp
|
101.38697
PS
|
110
hp
|
111.52566
PS
|
120
hp
|
121.66436
PS
|
130
hp
|
131.80306
PS
|
140
hp
|
141.94175
PS
|
150
hp
|
152.08045
PS
|
160
hp
|
162.21915
PS
|
170
hp
|
172.35784
PS
|
180
hp
|
182.49654
PS
|
190
hp
|
192.63524
PS
|
200
hp
|
202.77393
PS
|
210
hp
|
212.91263
PS
|
220
hp
|
223.05133
PS
|
230
hp
|
233.19002
PS
|
240
hp
|
243.32872
PS
|
250
hp
|
253.46742
PS
|
260
hp
|
263.60611
PS
|
270
hp
|
273.74481
PS
|
280
hp
|
283.88351
PS
|
290
hp
|
294.0222
PS
|
300
hp
|
304.1609
PS
|
310
hp
|
314.2996
PS
|
320
hp
|
324.43829
PS
|
330
hp
|
334.57699
PS
|
340
hp
|
344.71569
PS
|
350
hp
|
354.85438
PS
|
360
hp
|
364.99308
PS
|
370
hp
|
375.13178
PS
|
380
hp
|
385.27047
PS
|
390
hp
|
395.40917
PS
|
400
hp
|
405.54787
PS
|
410
hp
|
415.68656
PS
|
420
hp
|
425.82526
PS
|
430
hp
|
435.96396
PS
|
440
hp
|
446.10265
PS
|
450
hp
|
456.24135
PS
|
460
hp
|
466.38005
PS
|
470
hp
|
476.51874
PS
|
480
hp
|
486.65744
PS
|
490
hp
|
496.79614
PS
|
500
hp
|
506.93483
PS
|
510
hp
|
517.07353
PS
|
520
hp
|
527.21223
PS
|
530
hp
|
537.35092
PS
|
540
hp
|
547.48962
PS
|
550
hp
|
557.62832
PS
|
560
hp
|
567.76701
PS
|
570
hp
|
577.90571
PS
|
580
hp
|
588.04441
PS
|
590
hp
|
598.1831
PS
|
600
hp
|
608.3218
PS
|
610
hp
|
618.4605
PS
|
620
hp
|
628.59919
PS
|
630
hp
|
638.73789
PS
|
640
hp
|
648.87659
PS
|
650
hp
|
659.01528
PS
|
660
hp
|
669.15398
PS
|
670
hp
|
679.29268
PS
|
680
hp
|
689.43137
PS
|
690
hp
|
699.57007
PS
|
700
hp
|
709.70877
PS
|
710
hp
|
719.84746
PS
|
720
hp
|
729.98616
PS
|
730
hp
|
740.12486
PS
|
740
hp
|
750.26355
PS
|
750
hp
|
760.40225
PS
|
760
hp
|
770.54095
PS
|
770
hp
|
780.67964
PS
|
780
hp
|
790.81834
PS
|
790
hp
|
800.95704
PS
|
800
hp
|
811.09573
PS
|
810
hp
|
821.23443
PS
|
820
hp
|
831.37313
PS
|
830
hp
|
841.51182
PS
|
840
hp
|
851.65052
PS
|
850
hp
|
861.78922
PS
|
860
hp
|
871.92791
PS
|
870
hp
|
882.06661
PS
|
880
hp
|
892.20531
PS
|
890
hp
|
902.344
PS
|
900
hp
|
912.4827
PS
|
910
hp
|
922.6214
PS
|
920
hp
|
932.76009
PS
|
930
hp
|
942.89879
PS
|
940
hp
|
953.03749
PS
|
950
hp
|
963.17618
PS
|
960
hp
|
973.31488
PS
|
970
hp
|
983.45358
PS
|
980
hp
|
993.59227
PS
|
990
hp
|
1003.73097
PS
|
1000
hp
|
1013.86967
PS
|
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