The Concrete Modulus of Elasticity is calculated using BS8110: Part 2, Section 7.2 for concrete weight between 2,160 and 2,480 kg/m ³.

$E_c=20+0.2f_{cu}$ (kN/mm2)

Equation 5-1

For lightweight aggregate concrete E_c is multiplied by ${\left(\frac{{\delta }_C}{2,400}\right)}^2$