Newtons per millimeter to pounds-force per inch
Type a value in N/mm to get it in lbf/in instantly.
57.1lbf/in
That's about the same as a mattress spring. A 10 kg weight would squash it about 9.807 mm.
Convert the other way: lbf/in to N/mm
What it means
How much does it give?
Real springs only follow this straight line within their working range. Past that they bind or take a permanent set.
The math
How to convert N/mm to lbf/in
To convert newtons per millimeter to pounds-force per inch, multiply by 5.71015.
Example: 10 N/mm × 5.71015 = 57.1015 lbf/in.
In the other direction, 1 lbf/in = 0.175127 N/mm.
Every unit
Your spring rate in every unit
Tables
N/mm to lbf/in conversion table
| N/mm | lbf/in |
|---|---|
| 0.5 N/mm | 2.85507 lbf/in |
| 1 N/mm | 5.71015 lbf/in |
| 2 N/mm | 11.4203 lbf/in |
| 5 N/mm | 28.5507 lbf/in |
| 10 N/mm | 57.1015 lbf/in |
| 20 N/mm | 114.203 lbf/in |
| 30 N/mm | 171.304 lbf/in |
| 50 N/mm | 285.507 lbf/in |
| 75 N/mm | 428.261 lbf/in |
| 100 N/mm | 571.015 lbf/in |
| 200 N/mm | 1,142.03 lbf/in |
lbf/in to N/mm conversion table
| lbf/in | N/mm |
|---|---|
| 0.5 lbf/in | 0.0875634 N/mm |
| 1 lbf/in | 0.175127 N/mm |
| 2 lbf/in | 0.350254 N/mm |
| 5 lbf/in | 0.875634 N/mm |
| 10 lbf/in | 1.75127 N/mm |
| 20 lbf/in | 3.50254 N/mm |
| 30 lbf/in | 5.25381 N/mm |
| 50 lbf/in | 8.75634 N/mm |
| 75 lbf/in | 13.1345 N/mm |
| 100 lbf/in | 17.5127 N/mm |
| 200 lbf/in | 35.0254 N/mm |
Quick answers
Quick answers
- How many lbf/in is 1 N/mm?
- 1 N/mm is 5.71015 lbf/in.
- How many lbf/in is 10 N/mm?
- 10 N/mm is 57.1015 lbf/in.
The units
About these units
Newtons per millimeter (N/mm)
The practical metric unit for suspension and machine springs.
Pounds-force per inch (lbf/in)
The US spring unit. A 400 lb/in spring is 70 N/mm.
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