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.
The newton, symbolized as “N,” is a unit of force in the International System of Units (SI), named after Sir Isaac Newton in recognition of his groundbreaking contributions to physics and calculus. One newton is defined as the force required to accelerate a one-kilogram object by one meter per second squared. While often seen as a standard measurement today, the concept was revolutionary in understanding and quantifying the forces that govern motion.
In everyday terms, a single newton is roughly the force of gravity acting on a small apple, exemplifying Newton’s famous apple story in a tangible way. This relatable image of a newton provides a perspective on how forces influence our world, connecting abstract physics with the tangible experiences of everyday life.
Kilogram-forces | Newtons |
---|---|
0
kgf
|
0
N
|
1
kgf
|
9.807
N
|
2
kgf
|
19.614
N
|
3
kgf
|
29.421
N
|
4
kgf
|
39.228
N
|
5
kgf
|
49.035
N
|
6
kgf
|
58.842
N
|
7
kgf
|
68.649
N
|
8
kgf
|
78.456
N
|
9
kgf
|
88.263
N
|
10
kgf
|
98.07
N
|
11
kgf
|
107.877
N
|
12
kgf
|
117.684
N
|
13
kgf
|
127.491
N
|
14
kgf
|
137.298
N
|
15
kgf
|
147.105
N
|
16
kgf
|
156.912
N
|
17
kgf
|
166.719
N
|
18
kgf
|
176.526
N
|
19
kgf
|
186.333
N
|
20
kgf
|
196.14
N
|
21
kgf
|
205.947
N
|
22
kgf
|
215.754
N
|
23
kgf
|
225.561
N
|
24
kgf
|
235.368
N
|
25
kgf
|
245.175
N
|
26
kgf
|
254.982
N
|
27
kgf
|
264.789
N
|
28
kgf
|
274.596
N
|
29
kgf
|
284.403
N
|
30
kgf
|
294.21
N
|
31
kgf
|
304.017
N
|
32
kgf
|
313.824
N
|
33
kgf
|
323.631
N
|
34
kgf
|
333.438
N
|
35
kgf
|
343.245
N
|
36
kgf
|
353.052
N
|
37
kgf
|
362.859
N
|
38
kgf
|
372.666
N
|
39
kgf
|
382.473
N
|
40
kgf
|
392.28
N
|
41
kgf
|
402.087
N
|
42
kgf
|
411.894
N
|
43
kgf
|
421.701
N
|
44
kgf
|
431.508
N
|
45
kgf
|
441.315
N
|
46
kgf
|
451.122
N
|
47
kgf
|
460.929
N
|
48
kgf
|
470.736
N
|
49
kgf
|
480.543
N
|
50
kgf
|
490.35
N
|
51
kgf
|
500.157
N
|
52
kgf
|
509.964
N
|
53
kgf
|
519.771
N
|
54
kgf
|
529.578
N
|
55
kgf
|
539.385
N
|
56
kgf
|
549.192
N
|
57
kgf
|
559
N
|
58
kgf
|
568.806
N
|
59
kgf
|
578.613
N
|
60
kgf
|
588.42
N
|
61
kgf
|
598.227
N
|
62
kgf
|
608.034
N
|
63
kgf
|
617.841
N
|
64
kgf
|
627.648
N
|
65
kgf
|
637.455
N
|
66
kgf
|
647.262
N
|
67
kgf
|
657.069
N
|
68
kgf
|
666.876
N
|
69
kgf
|
676.683
N
|
70
kgf
|
686.49
N
|
71
kgf
|
696.297
N
|
72
kgf
|
706.104
N
|
73
kgf
|
715.911
N
|
74
kgf
|
725.718
N
|
75
kgf
|
735.525
N
|
76
kgf
|
745.332
N
|
77
kgf
|
755.139
N
|
78
kgf
|
764.946
N
|
79
kgf
|
774.753
N
|
80
kgf
|
784.56
N
|
81
kgf
|
794.367
N
|
82
kgf
|
804.174
N
|
83
kgf
|
813.981
N
|
84
kgf
|
823.788
N
|
85
kgf
|
833.595
N
|
86
kgf
|
843.402
N
|
87
kgf
|
853.209
N
|
88
kgf
|
863.016
N
|
89
kgf
|
872.823
N
|
90
kgf
|
882.63
N
|
91
kgf
|
892.437
N
|
92
kgf
|
902.244
N
|
93
kgf
|
912.051
N
|
94
kgf
|
921.858
N
|
95
kgf
|
931.665
N
|
96
kgf
|
941.472
N
|
97
kgf
|
951.279
N
|
98
kgf
|
961.086
N
|
99
kgf
|
970.893
N
|
100
kgf
|
980.7
N
|
Conversion | Call to Action |
---|---|
Kilogram-forces to Kilonewtons | Go to converter |
Kilogram-forces to Pound-forces | Go to converter |
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