Perfect Egg Boiling Time Calculator
Get the exact boiling time for perfectly cooked eggs every time — from runny yolk soft-boiled to fully set hard-boiled. Accounts for egg size and fridge vs room temperature.
Egg Boiling Guide
The Science of Boiling an Egg
Egg white (albumen) begins setting at 62°C and fully sets by 82°C. Egg yolk begins setting at 65°C and fully sets at approximately 70°C. This narrow temperature window is why precision matters — a minute too long and a soft-boiled egg becomes hard-boiled. Cooking times vary with egg size, starting temperature, whether lowered into already-boiling water or started in cold water, and altitude (where water boils at lower temperatures, increasing cooking times).
Boiling Method Comparison
Cold water start: place eggs in cold water, bring to boil, time from boiling point. Produces slightly more even cooking but makes timing less precise. Boiling water start: lower eggs into already-boiling water (use a spoon), time immediately. More precise and recommended for soft-boiled eggs. Sous vide: 63°C for 1 hour produces a perfectly silky barely-set soft-boiled egg — the most reproducible method but requires equipment. Steaming: 1–2 minutes faster than boiling, produces consistent results
Peeling Tips
Fresh eggs (under 1 week old) are notoriously difficult to peel because the albumen adheres more strongly to the membrane at low pH. Older eggs (1–2 weeks in fridge) peel much more easily — this is counterintuitive but well-established. The ice bath method: plunge immediately into ice water for 5 minutes after cooking. This halts cooking, creates a brief vacuum effect that helps separate shell, and makes the egg cold enough to handle. Rolling the egg on the counter to create fine cracks all over
Altitude and Boiling Point
Water boils at 100°C at sea level. At 1,000m altitude, it boils at 96.4°C. At 2,000m, 93°C. At 5,000m (high altitude trekking), approximately 83°C. Each 300m increase in altitude reduces boiling point by approximately 1°C and increases egg cooking time by approximately 10–15 seconds. At 1,000m, a medium soft-boiled egg needs approximately 30 seconds longer. At 3,000m (Colorado, La Paz), cooking times increase by approximately 1.5–2 minutes.
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