We frequently convert spring rates from US to metric
units, or metric to US. Here is a quick conversion chart and some easy math to do the job for
you.
- To convert lbs/in to kg/mm, divide by 56.
- To convert kg/mm to lbs/inch, multiply by 56.
- It’s quick and easy to remember!
Lbs/ inch Kg/mm
200 3.6
250 4.5
300 5.4
350 6.3
400 7.2
450 8.1
500 9.0
550 9.8
600 10.7
600 10.7
650 11.6
700 12.5
750 13.4
800 14.3
850 15.2
900 16.1
950 17.0
1000 17.9
1050 18.8
1100 19.7
1150 20.6
1200 21.5
