As we know One g·mm² is equal to 1.E-9 kg·m² (1 g·mm² = 1.E-9 kg·m²).

To convert Gram Square Millimeter to Kilogram Square Meter, multiply your g·mm² figure by 1.E-9.

Example : convert 25 g·mm² to kg·m²:

25 g·mm² = 25 × 1.E-9 kg·m² = kg·m²

To convert Kilogram Square Meter to Gram Square Millimeter, divide your kg·m² figure by 1.E-9.

Example : convert 25 kg·m² to g·mm²:

25 kg·m² = 25 ÷ 1.E-9 g·mm² = g·mm²