As we know One lbf·ft·s² is equal to 1355817961.9 g·mm² (1 lbf·ft·s² = 1355817961.9 g·mm²).

To convert Pound-Force Foot Square Second to Gram Square Millimeter, multiply your lbf·ft·s² figure by 1355817961.9.

Example : convert 25 lbf·ft·s² to g·mm²:

25 lbf·ft·s² = 25 × 1355817961.9 g·mm² = g·mm²

To convert Gram Square Millimeter to Pound-Force Foot Square Second, divide your g·mm² figure by 1355817961.9.

Example : convert 25 g·mm² to lbf·ft·s²:

25 g·mm² = 25 ÷ 1355817961.9 lbf·ft·s² = lbf·ft·s²