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 foot-pound per second is an intriguing unit of power that encapsulates the essence of energy transfer in mechanical systems. A single foot-pound per second equates to the rate at which one pound-force transfers energy across a distance of one foot in a second. Lesser-known than its metric counterpart, the watt, foot-pound per second offers insight into the blend of force, distance, and time that’s crucial to understanding mechanical work.
Interestingly, the unit serves as a bridge between imperial and metric systems, with one foot-pound per second equivalent to approximately 1.3558 watts. This conversion showcases the interconnectedness of diverse measurement systems. The unit highlights the ingenuity of early inventors and engineers like James Watt, whose advancements in engine technology continue to influence how we conceptualize power and efficiency today.
Horsepower (British) | Foot-pounds per second |
---|---|
0
hp
|
0
ft-lb/s
|
10
hp
|
5500
ft-lb/s
|
20
hp
|
11000
ft-lb/s
|
30
hp
|
16500
ft-lb/s
|
40
hp
|
22000
ft-lb/s
|
50
hp
|
27500
ft-lb/s
|
60
hp
|
33000
ft-lb/s
|
70
hp
|
38500
ft-lb/s
|
80
hp
|
44000
ft-lb/s
|
90
hp
|
49500
ft-lb/s
|
100
hp
|
55000
ft-lb/s
|
110
hp
|
60500
ft-lb/s
|
120
hp
|
66000
ft-lb/s
|
130
hp
|
71500
ft-lb/s
|
140
hp
|
77000
ft-lb/s
|
150
hp
|
82500
ft-lb/s
|
160
hp
|
88000
ft-lb/s
|
170
hp
|
93500
ft-lb/s
|
180
hp
|
99000
ft-lb/s
|
190
hp
|
104500
ft-lb/s
|
200
hp
|
110000
ft-lb/s
|
210
hp
|
115500
ft-lb/s
|
220
hp
|
121000
ft-lb/s
|
230
hp
|
126500
ft-lb/s
|
240
hp
|
132000
ft-lb/s
|
250
hp
|
137500
ft-lb/s
|
260
hp
|
143000
ft-lb/s
|
270
hp
|
148500
ft-lb/s
|
280
hp
|
154000
ft-lb/s
|
290
hp
|
159500
ft-lb/s
|
300
hp
|
165000
ft-lb/s
|
310
hp
|
170500
ft-lb/s
|
320
hp
|
176000
ft-lb/s
|
330
hp
|
181500
ft-lb/s
|
340
hp
|
187000
ft-lb/s
|
350
hp
|
192500
ft-lb/s
|
360
hp
|
198000
ft-lb/s
|
370
hp
|
203500
ft-lb/s
|
380
hp
|
209000
ft-lb/s
|
390
hp
|
214500
ft-lb/s
|
400
hp
|
220000
ft-lb/s
|
410
hp
|
225500
ft-lb/s
|
420
hp
|
231000
ft-lb/s
|
430
hp
|
236500
ft-lb/s
|
440
hp
|
242000
ft-lb/s
|
450
hp
|
247500
ft-lb/s
|
460
hp
|
253000
ft-lb/s
|
470
hp
|
258500
ft-lb/s
|
480
hp
|
264000
ft-lb/s
|
490
hp
|
269500
ft-lb/s
|
500
hp
|
275000
ft-lb/s
|
510
hp
|
280500
ft-lb/s
|
520
hp
|
286000
ft-lb/s
|
530
hp
|
291500
ft-lb/s
|
540
hp
|
297000
ft-lb/s
|
550
hp
|
302500
ft-lb/s
|
560
hp
|
308000
ft-lb/s
|
570
hp
|
313500
ft-lb/s
|
580
hp
|
319000
ft-lb/s
|
590
hp
|
324500
ft-lb/s
|
600
hp
|
330000
ft-lb/s
|
610
hp
|
335500
ft-lb/s
|
620
hp
|
341000
ft-lb/s
|
630
hp
|
346500
ft-lb/s
|
640
hp
|
352000
ft-lb/s
|
650
hp
|
357500
ft-lb/s
|
660
hp
|
363000
ft-lb/s
|
670
hp
|
368500
ft-lb/s
|
680
hp
|
374000
ft-lb/s
|
690
hp
|
379500
ft-lb/s
|
700
hp
|
385000
ft-lb/s
|
710
hp
|
390500
ft-lb/s
|
720
hp
|
396000
ft-lb/s
|
730
hp
|
401500
ft-lb/s
|
740
hp
|
407000
ft-lb/s
|
750
hp
|
412500
ft-lb/s
|
760
hp
|
418000
ft-lb/s
|
770
hp
|
423500
ft-lb/s
|
780
hp
|
429000
ft-lb/s
|
790
hp
|
434500
ft-lb/s
|
800
hp
|
440000
ft-lb/s
|
810
hp
|
445500
ft-lb/s
|
820
hp
|
451000
ft-lb/s
|
830
hp
|
456500
ft-lb/s
|
840
hp
|
462000
ft-lb/s
|
850
hp
|
467500
ft-lb/s
|
860
hp
|
473000
ft-lb/s
|
870
hp
|
478500
ft-lb/s
|
880
hp
|
484000
ft-lb/s
|
890
hp
|
489500
ft-lb/s
|
900
hp
|
495000
ft-lb/s
|
910
hp
|
500500
ft-lb/s
|
920
hp
|
506000
ft-lb/s
|
930
hp
|
511500
ft-lb/s
|
940
hp
|
517000
ft-lb/s
|
950
hp
|
522500
ft-lb/s
|
960
hp
|
528000
ft-lb/s
|
970
hp
|
533500
ft-lb/s
|
980
hp
|
539000
ft-lb/s
|
990
hp
|
544500
ft-lb/s
|
1000
hp
|
550000
ft-lb/s
|
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