Double every dimension of a shape and its area quadruples while its volume grows eightfold — the exponent, not the shape, decides how fast size compounds.
This is why small animals lose heat faster relative to their mass (surface area) than large ones, and why doubling a tank’s dimensions needs eight times the material to hold eight times the liquid, not twice.
Estimate with the rule, then check it against the calculator that models it properly.
Open Geometry — 2D & 3D →