Email: Sales@IPGparts.com | Phone: 407-324-4684
Email: Sales@IPGparts.com | Phone: 407-324-4684

# Spring Conversion Chart -- kg/mm to lbs/in

When I find useful information on the internet I like to try and pass it on. Ever gotten irritated trying to figure out what your kg/mm spring rates are in lbs/in ? I came across this handy post on Evolutionm.net -- http://forums.evolutionm.net/evo-tires-wheels-brakes-suspension-sponsored-tire-rack/308025-spring-rate-conversions-kg-mm-lbs.html 1lb = 0.45359237kg 1in = 25.4mm .45359237 / 25.4 = .017857967322834645669291338582677 So now we know that 1lb/in = .017857967322834645669291338582677. So if we want a spring that's roughly 560lbs; we'd multiply both sides by 560, and come up with roughly a 10k spring rate. Alternatively if you already know the kg/mm rate and want to find out what the lbs/in is, just divide the spring rate by that reaaally long factoral above (the .0178...). But just in case you all didn't want to go through all that, here's a chart: kg/mm to lbs/in ----------------------------- 16 = 896 15 = 840 14 = 784 13 = 728 12 = 672 11 = 616 10 = 560 9.0 = 504 8.5 = 476 8.0 = 448 7.5 = 420 7.0 = 392 6.5 = 364 6.0 = 336 5.5 = 308 5.0 = 280 4.5 = 252 4.0 = 224 3.0 = 168 2.0 = 112 