Egg Boiling Time Calculator by Altitude
Perfect eggs, every time ⏱️🥚
Get precise boiling times based on your altitude, egg size, and desired doneness. Science-backed calculations for perfect results.
Select the size of your eggs
Drop eggs into already boiling water
1-24 eggs. Batches over 4 need extra time.
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This free boiling eggs at altitude calculator adjusts time for elevation, egg size, doneness, starting temperature, and how many eggs are in the pot. The form above does the math; the steps below are the cooking routine.
- Set your altitude. Type your elevation in meters or feet, or tap Detect My Altitude. Water boils cooler as you go up, so this is the number the timer needs most.
- Choose size, doneness, and batch. Pick the carton size (medium, large, or extra-large), the yolk you want (soft, jammy, or hard), fridge vs room-temp eggs, hot or cold water start, and how many eggs are in the pot.
- Cook, then chill. Start the timer when the calculator says to add the eggs.
Want the physics? Read the science of boiling eggs. For a pan-side walkthrough of each yolk, see boiling methods ( soft-boiled, jammy, hard-boiled ). When the eggs are done, try ramen eggs, deviled eggs, or egg salad.
Frequently asked questions
Why does altitude change egg boiling time?
At higher elevation, lower air pressure means water boils below 100°C / 212°F. Egg whites and yolks still need the same internal temperatures to set, so they take longer. Enter your altitude (or use Detect My Altitude) and the timer adds that extra time instead of using a sea-level chart.
Does egg size change the time?
Yes. A larger egg has more mass, so heat takes longer to reach the yolk. Choose medium, large, or extra-large to match the carton — the time updates as soon as you change it.
What is the difference between soft, jammy, and hard?
Soft is a runny yolk, jammy is custardy (think ramen eggs), and hard is fully set through the center. The calculator times for the yolk texture you pick, not a generic “boil for 10 minutes.” Walk through each one on the methods pages.
See soft-boiled , jammy , and hard-boiled methods, or the methods hub.
How do I make boiled eggs easy to peel?
Immediately put cooked eggs in cold water to make them easy to peel. Ice water for a few minutes also stops them from cooking further in the shell.