Egg Boiling Calculator
Find the perfect egg boil time for soft, medium or hard eggs by size, with altitude adjustment.
Times assume eggs straight from the fridge into boiling water, at sea level. Add 1 minute per 300 m above 1000 m altitude.
Boil time
10 minutes
Altitude adjustment
+0 min
Water boils at a lower temperature at height
Start the timer from when the water returns to a rolling boil after adding the eggs.
Egg Boiling Calculator on True Calculator gives you an instant, accurate answer with no sign-up and no app install. Find the perfect egg boil time for soft, medium or hard eggs by size, with altitude adjustment. Every result shows the formula and a worked example so you can verify the calculation yourself, and all values are computed in your own browser — your numbers never leave your device.
Popular uses: egg boiling calculator · how long to boil eggs · soft boiled egg time
How We Calculate
This calculator uses simple, everyday arithmetic verified by our team. All calculations are performed instantly in your browser using JavaScript — no data is sent to any server.
Rates and figures used here follow common Indian retail and billing conventions, and are regularly updated to match current practice.
When to Use This Calculator
Use this calculator whenever breakfast timing matters — the difference between a runny yolk and a hard one is a matter of minutes, and the stove waits for nobody. Hostel students, working parents packing lunchboxes, and fitness enthusiasts who batch-boil eggs for the week all need repeatable timing rather than guesswork. The altitude field covers Indian hill stations and mountain towns where water boils below 100 °C and standard recipes fail. Because the results are simple minute values, you can set a phone timer and walk away. Once you settle on the setting you like, the same combination gives identical results every time.
How to Use This Calculator
- Step 1: Pick the egg size — small, medium or large — from the first dropdown.
- Step 2: Choose soft, medium or hard doneness for the yolk.
- Step 3: Enter your altitude in metres (0 at sea level, higher for hill towns).
- Step 4: Boil, start the timer when the water returns to a rolling boil, and cool the eggs immediately.
Worked Example
For a medium egg boiled hard at sea level, the calculator returns 10 minutes. The same egg cooked soft needs only 5 minutes. If you live in a hill town at 1600 m, a large egg cooked to a jammy medium yolk takes 8 + 2 = 10 minutes, because the calculator adds one minute per 300 m above 1000 m. At 2500 m, a small hard-boiled egg needs 9 + 5 = 14 minutes. Dropping eggs into an ice bath right after the timer stops the cooking.
Tips and Common Mistakes
- •Use eggs straight from the fridge for consistent timing — room-temperature eggs cook faster.
- •Start the clock only after the water is boiling again, not when you drop the eggs in.
- •Cool in cold water for one to two minutes so the shell peels cleanly and the yolk stops cooking.
- ✗Avoid boiling eggs straight from a hot-water start — the timing base assumes a rolling boil.
- ✗Don't skip the altitude adjustment if you live above 1000 m; eggs come out undercooked otherwise.
Frequently Asked Questions
How long does a medium egg take to hard boil?
About 10 minutes from when the water returns to a rolling boil at sea level. Soft eggs take 5 minutes and jammy medium yolks take 7 minutes for the same size.
Does altitude really change boiling time?
Yes — water boils at a lower temperature at altitude, so eggs cook more slowly. The calculator adds 1 minute per 300 m above 1000 m; a hard-boiled small egg at 2500 m needs 14 minutes instead of 9.
Should the timer start when the water boils or when I add the eggs?
Start it when the water returns to a full rolling boil after you drop the eggs in. Timing from cold water will overcook the eggs because the clock keeps running while the water heats.
Why does size matter for boiling time?
A larger egg has more mass and needs more time for the heat to reach the yolk. The difference between small and large is roughly 1.5–3 minutes depending on how you like the yolk.
How do I stop eggs overcooking after the timer?
Drain the hot water and cover the eggs with cold water or an ice bath for a minute or two. That halts the cooking so the yolk stays exactly at the doneness you chose.
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