Calculator requires explosive mass (w [kg]) and relative effectiveness factor (k).
N.B. "Damage" parameter is intended mainly for MKLT game project, but it could be also used for convenient guns' performance comparison.
Explosive penetration:
$$P = \sqrt[3]{\frac{w \times k}{6}} \times 50$$
HESH penetration:
$$P_{HESH} = \sqrt[3]{\frac{w \times k}{4.31}} \times 127$$
Explosive damage:
$$D = \sqrt[2.1]{\frac{w \times k \times 4228000}{23 \times 950^2 \times 0.5}} \times 400$$