API 650 Tank Primary Wind Girder Section Modulus

Dear Members,

I have a formula as per API 650 Cl, 5.9.7.6 (Primary wind girder section modulus):

Z = ((D² x H1)/17) x (V/190) ²

Where; Z = Section modulus = cm³

D = Tank diameter = 30m

H1 = Tank height =16m

V = equivalent wind velocity = 181 kph

Z = ((m² x m)/17) x (kph/kph) ^{2 =} m³

After Calculate I got Z = 768.7 m³.

The problem is how to convert it to 768.7 cm³.

Could anyone advice us regarding this matter.

Thank you.