Calculate the perfect boiling time for your egg based on size and desired doneness.
Choose egg size, starting temperature and preferred centre, then calculate the suggested boiling time and start a separate kitchen timer when the water is ready.
Starting temperature, altitude, pan size and burner strength can shift the ideal time.
Egg size, starting temperature and the preferred centre all matter. A large refrigerator-cold egg needs a different approach from a smaller egg already near room temperature. The calculator combines those choices into a practical starting time so you can reproduce a style you like.
Pan size, the number of eggs, burner strength, water volume and altitude can shift the result. Decide whether your timing begins when the egg enters already-boiling water or while the water is heating, and use the same method each time if you want repeatable results. Cooling cooked eggs promptly in cold or iced water helps stop carry-over cooking. If the first batch is a little soft or firm for your preference, adjust the next run by 30 to 60 seconds rather than treating the displayed time as exact.