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Spring Rate Converter

Enter your spring rate in lb/in or kg/mm and have it automatically converted.

Not every manufacturer lists their spring rates in both units so a converter can be handy when comparing options.

If you’d like to convert rates yourself:

  • kg/mm / 55.88 = lb/in
  • lb/in * 55.88 = kg/mm

Quick Reference

lb/in kg/mm
100 1.79
150 2.68
200 3.58
250 4.47
300 5.37
350 6.26
400 7.16
450 8.05
500 8.95
550 9.84
600 10.74
650 11.63
700 12.53
750 13.42
800 14.32
850 15.21
900 16.11
950 17
1000 17.9
kg/mm lb/in
1 56
2 112
3 168
4 224
5 279
6 335
7 391
8 447
9 503
10 559
11 615
12 671
13 726
14 782
15 838
16 894
17 950
18 1006