For a perfectly boiled egg, use quantum physics | SAN ANTONIO XYZ | Scoop.it
Once you know all your variables, you need to plug it into Williams' formula.

t = m * K * log(ywr * (Tegg - Twater)/(T - Twater))

t = time
m = mass
K = thermal conductivity of the egg
T = temperature between white and yolk
Tegg = egg temperature
Twater = water temperature
ywr = yolk-white ratio