Pound-force is a fascinating unit that merges the concept of mass and gravity, rooted deeply in the imperial system. It represents the force exerted by gravity on a one-pound object at the Earth’s surface. Interestingly, the distinction between pound-force and pound-mass became vital as precision in science and engineering increased, leading to the creation of a standard gravitational constant. Unlike the pound used for weight, pound-force considers the acceleration due to gravity, approximately 32.174 ft/s², offering a glimpse into how we measure force beyond just mass.
In practical terms, the concept of pound-force is woven into everyday life, particularly in the United States, where the imperial system is prevalent. For example, when you hear that a tire is inflated to 30 psi (pounds per square inch), those “pounds” refer to pound-force. Understanding this unit gives an insight into how force impacts our daily mechanics, from vehicle dynamics to the tension in a bridge cable, illustrating the omnipresence of physics in our bustling world.
The kilogram-force (kgf) is a fascinating unit of force that originates from the gravitational pull exerted on a mass of one kilogram at Earth’s surface. Though it’s not a part of the International System of Units, it has historical significance in fields such as engineering and physics. One kilogram-force is equivalent to approximately 9.80665 newtons, reflecting the acceleration due to Earth’s gravity at sea level.
Interestingly, the concept of kilogram-force harkens back to times when engineers needed a more intuitive way to express force without delving into the complexities of the then-emerging newtons. Its use has diminished with the universal adoption of newtons, but it still appears in various legacy systems and specific applications, especially in countries that historically avoided metrication.
| Pound-forces | Kilogram-forces |
|---|---|
0
lbf
|
0
kgf
|
10
lbf
|
4.53576
kgf
|
20
lbf
|
9.07152
kgf
|
30
lbf
|
13.60728
kgf
|
40
lbf
|
18.14304
kgf
|
50
lbf
|
22.6788
kgf
|
60
lbf
|
27.21456
kgf
|
70
lbf
|
31.75032
kgf
|
80
lbf
|
36.28608
kgf
|
90
lbf
|
40.82184
kgf
|
100
lbf
|
45.3576
kgf
|
110
lbf
|
49.89336
kgf
|
120
lbf
|
54.42912
kgf
|
130
lbf
|
58.96488
kgf
|
140
lbf
|
63.50064
kgf
|
150
lbf
|
68.0364
kgf
|
160
lbf
|
72.57216
kgf
|
170
lbf
|
77.10792
kgf
|
180
lbf
|
81.64368
kgf
|
190
lbf
|
86.17944
kgf
|
200
lbf
|
90.7152
kgf
|
210
lbf
|
95.25096
kgf
|
220
lbf
|
99.78672
kgf
|
230
lbf
|
104.32248
kgf
|
240
lbf
|
108.85824
kgf
|
250
lbf
|
113.394
kgf
|
260
lbf
|
117.92976
kgf
|
270
lbf
|
122.46552
kgf
|
280
lbf
|
127.00128
kgf
|
290
lbf
|
131.53704
kgf
|
300
lbf
|
136.07281
kgf
|
310
lbf
|
140.60857
kgf
|
320
lbf
|
145.14433
kgf
|
330
lbf
|
149.68009
kgf
|
340
lbf
|
154.21585
kgf
|
350
lbf
|
158.75161
kgf
|
360
lbf
|
163.28737
kgf
|
370
lbf
|
167.82313
kgf
|
380
lbf
|
172.35889
kgf
|
390
lbf
|
176.89465
kgf
|
400
lbf
|
181.43041
kgf
|
410
lbf
|
185.96617
kgf
|
420
lbf
|
190.50193
kgf
|
430
lbf
|
195.03769
kgf
|
440
lbf
|
199.57345
kgf
|
450
lbf
|
204.10921
kgf
|
460
lbf
|
208.64497
kgf
|
470
lbf
|
213.18073
kgf
|
480
lbf
|
217.71649
kgf
|
490
lbf
|
222.25225
kgf
|
500
lbf
|
226.78801
kgf
|
510
lbf
|
231.32377
kgf
|
520
lbf
|
235.85953
kgf
|
530
lbf
|
240.39529
kgf
|
540
lbf
|
244.93105
kgf
|
550
lbf
|
249.46681
kgf
|
560
lbf
|
254.00257
kgf
|
570
lbf
|
258.53833
kgf
|
580
lbf
|
263.07409
kgf
|
590
lbf
|
267.60985
kgf
|
600
lbf
|
272.14561
kgf
|
610
lbf
|
276.68137
kgf
|
620
lbf
|
281.21713
kgf
|
630
lbf
|
285.75289
kgf
|
640
lbf
|
290.28865
kgf
|
650
lbf
|
294.82441
kgf
|
660
lbf
|
299.36017
kgf
|
670
lbf
|
303.89593
kgf
|
680
lbf
|
308.43169
kgf
|
690
lbf
|
312.96745
kgf
|
700
lbf
|
317.50321
kgf
|
710
lbf
|
322.03897
kgf
|
720
lbf
|
326.57473
kgf
|
730
lbf
|
331.11049
kgf
|
740
lbf
|
335.64625
kgf
|
750
lbf
|
340.18201
kgf
|
760
lbf
|
344.71777
kgf
|
770
lbf
|
349.25353
kgf
|
780
lbf
|
353.78929
kgf
|
790
lbf
|
358.32505
kgf
|
800
lbf
|
362.86081
kgf
|
810
lbf
|
367.39657
kgf
|
820
lbf
|
371.93233
kgf
|
830
lbf
|
376.46809
kgf
|
840
lbf
|
381.00385
kgf
|
850
lbf
|
385.53961
kgf
|
860
lbf
|
390.07537
kgf
|
870
lbf
|
394.61113
kgf
|
880
lbf
|
399.1469
kgf
|
890
lbf
|
403.68266
kgf
|
900
lbf
|
408.21842
kgf
|
910
lbf
|
412.75418
kgf
|
920
lbf
|
417.28994
kgf
|
930
lbf
|
421.8257
kgf
|
940
lbf
|
426.36146
kgf
|
950
lbf
|
430.89722
kgf
|
960
lbf
|
435.43298
kgf
|
970
lbf
|
439.96874
kgf
|
980
lbf
|
444.5045
kgf
|
990
lbf
|
449.04026
kgf
|
1000
lbf
|
453.57602
kgf
|
| Conversion | Call to Action |
|---|---|
| Pound-forces to Newtons | Go to converter |
| Pound-forces to Kilonewtons | Go to converter |
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