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-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.
Kilogram-forces | Pound-forces |
---|---|
0
kgf
|
0
lbf
|
1
kgf
|
2.2047
lbf
|
2
kgf
|
4.4094
lbf
|
3
kgf
|
6.61411
lbf
|
4
kgf
|
8.81881
lbf
|
5
kgf
|
11.02351
lbf
|
6
kgf
|
13.22821
lbf
|
7
kgf
|
15.43291
lbf
|
8
kgf
|
17.63762
lbf
|
9
kgf
|
19.84232
lbf
|
10
kgf
|
22.04702
lbf
|
11
kgf
|
24.25172
lbf
|
12
kgf
|
26.45643
lbf
|
13
kgf
|
28.66113
lbf
|
14
kgf
|
30.86583
lbf
|
15
kgf
|
33.07053
lbf
|
16
kgf
|
35.27523
lbf
|
17
kgf
|
37.47994
lbf
|
18
kgf
|
39.68464
lbf
|
19
kgf
|
41.88934
lbf
|
20
kgf
|
44.09404
lbf
|
21
kgf
|
46.29874
lbf
|
22
kgf
|
48.50345
lbf
|
23
kgf
|
50.70815
lbf
|
24
kgf
|
52.91285
lbf
|
25
kgf
|
55.11755
lbf
|
26
kgf
|
57.32225
lbf
|
27
kgf
|
59.52696
lbf
|
28
kgf
|
61.73166
lbf
|
29
kgf
|
63.93636
lbf
|
30
kgf
|
66.14106
lbf
|
31
kgf
|
68.34577
lbf
|
32
kgf
|
70.55047
lbf
|
33
kgf
|
72.75517
lbf
|
34
kgf
|
74.95987
lbf
|
35
kgf
|
77.16457
lbf
|
36
kgf
|
79.36928
lbf
|
37
kgf
|
81.57398
lbf
|
38
kgf
|
83.77868
lbf
|
39
kgf
|
85.98338
lbf
|
40
kgf
|
88.18808
lbf
|
41
kgf
|
90.39279
lbf
|
42
kgf
|
92.59749
lbf
|
43
kgf
|
94.80219
lbf
|
44
kgf
|
97.00689
lbf
|
45
kgf
|
99.21159
lbf
|
46
kgf
|
101.4163
lbf
|
47
kgf
|
103.621
lbf
|
48
kgf
|
105.8257
lbf
|
49
kgf
|
108.0304
lbf
|
50
kgf
|
110.23511
lbf
|
51
kgf
|
112.43981
lbf
|
52
kgf
|
114.64451
lbf
|
53
kgf
|
116.84921
lbf
|
54
kgf
|
119.05391
lbf
|
55
kgf
|
121.25862
lbf
|
56
kgf
|
123.46332
lbf
|
57
kgf
|
125.66802
lbf
|
58
kgf
|
127.87272
lbf
|
59
kgf
|
130.07742
lbf
|
60
kgf
|
132.28213
lbf
|
61
kgf
|
134.48683
lbf
|
62
kgf
|
136.69153
lbf
|
63
kgf
|
138.89623
lbf
|
64
kgf
|
141.10093
lbf
|
65
kgf
|
143.30564
lbf
|
66
kgf
|
145.51034
lbf
|
67
kgf
|
147.71504
lbf
|
68
kgf
|
149.91974
lbf
|
69
kgf
|
152.12445
lbf
|
70
kgf
|
154.32915
lbf
|
71
kgf
|
156.53385
lbf
|
72
kgf
|
158.73855
lbf
|
73
kgf
|
160.94325
lbf
|
74
kgf
|
163.14796
lbf
|
75
kgf
|
165.35266
lbf
|
76
kgf
|
167.55736
lbf
|
77
kgf
|
169.76206
lbf
|
78
kgf
|
171.96676
lbf
|
79
kgf
|
174.17147
lbf
|
80
kgf
|
176.37617
lbf
|
81
kgf
|
178.58087
lbf
|
82
kgf
|
180.78557
lbf
|
83
kgf
|
182.99027
lbf
|
84
kgf
|
185.19498
lbf
|
85
kgf
|
187.39968
lbf
|
86
kgf
|
189.60438
lbf
|
87
kgf
|
191.80908
lbf
|
88
kgf
|
194.01379
lbf
|
89
kgf
|
196.21849
lbf
|
90
kgf
|
198.42319
lbf
|
91
kgf
|
200.62789
lbf
|
92
kgf
|
202.83259
lbf
|
93
kgf
|
205.0373
lbf
|
94
kgf
|
207.242
lbf
|
95
kgf
|
209.4467
lbf
|
96
kgf
|
211.6514
lbf
|
97
kgf
|
213.8561
lbf
|
98
kgf
|
216.06081
lbf
|
99
kgf
|
218.26551
lbf
|
100
kgf
|
220.47021
lbf
|
Conversion | Call to Action |
---|---|
Kilogram-forces to Newtons | Go to converter |
Kilogram-forces to Kilonewtons | Go to converter |
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