As we know One g·mm² is equal to 0.0000034172 lb·in² (1 g·mm² = 0.0000034172 lb·in²).

To convert Gram Square Millimeter to Pound Square Inch, multiply your g·mm² figure by 0.0000034172.

Example : convert 25 g·mm² to lb·in²:

25 g·mm² = 25 × 0.0000034172 lb·in² = lb·in²

To convert Pound Square Inch to Gram Square Millimeter, divide your lb·in² figure by 0.0000034172.

Example : convert 25 lb·in² to g·mm²:

25 lb·in² = 25 ÷ 0.0000034172 g·mm² = g·mm²