How to use the egg boiling time calculator
Prepare the values for this calculation
Estimate the time for the white–yolk boundary of an idealized egg to reach a chosen temperature after the egg is placed in hot water. The model treats the egg as a homogeneous sphere and is a heat-transfer estimate, not a food-safety guarantee. Use the formula below to check that it answers your question. Read the input units before transferring figures from a statement, measurement or dataset.
Enter and check each input
- Egg mass (g): enter a value at least 1 and no more than 250. Use the unit named in the label or selected above. Do not leave this required field blank.
- Initial egg temperature (°C): enter a value at least -20 and no more than 60. Use the unit named in the label or selected above. Do not leave this required field blank.
- Water temperature (°C): enter a value at least 1 and no more than 110. Use the unit named in the label or selected above. Do not leave this required field blank.
- Target temperature at white–yolk boundary (°C): enter a value at least 1 and no more than 99. Use the unit named in the label or selected above. Do not leave this required field blank.
The input table gives a complete example. Keep units and time periods consistent across related fields.
Calculate and resolve any input error
Choose Calculate after entering the values. Changes also update the answer after a short pause. If an error appears, follow its message, correct the field and calculate again. Reset restores the example values.
Interpret the answer
Check Estimated heating time first. With the unchanged example inputs, it is 4 min 32 sec. Compare the additional metrics with the primary result; each has its own label and unit.
Compare and keep a useful result
For a controlled comparison, keep every other example input unchanged and change Egg mass (g) from 57 to 62.7. The resulting Estimated heating time is 4 min 50 sec. This illustrates the equation’s response to that input, rather than a forecast of real events.
Read the chart’s axis labels and data table. A scenario curve changes one stated input while holding the others fixed; it does not add external observations. Use Download graph to save an available chart as a PNG.
Use Copy result or Download CSV to keep the answer. Share tool shares the page address without placing your input values in the URL. Recheck inputs and assumptions before using the result for a decision.
Egg Boiling Time Calculator formula
t = [M^(2/3) c ρ^(1/3)] / [K π² (4π/3)^(2/3)] × ln[0.76 × (Tegg − Twater)/(Ttarget − Twater)], using the published egg-property constants ρ = 1.038 g/cm³, c = 3.7 J/(g·K), K = 5.4×10⁻³ W/(cm·K).
Inputs and units
| Input | Format / range | Example |
|---|---|---|
| Egg mass (g) | minimum 1; maximum 250 | 57 |
| Initial egg temperature (°C) | minimum -20; maximum 60 | 4 |
| Water temperature (°C) | minimum 1; maximum 110 | 100 |
| Target temperature at white–yolk boundary (°C) | minimum 1; maximum 99 | 63 |
Worked example
Using the example inputs above, the estimated heating time is 4 min 32 sec.
- Estimated heating time
- 4 min 32 sec
- Decimal minutes
- 4.534
- Calculated seconds
- 272.0
- Published density used
- 1.038 g/cm³
- Published specific heat used
- 3.7 J/(g·K)
- Published thermal conductivity used
- 0.0054 W/(cm·K)
Results and assumptions
Idealized heat-diffusion estimate only. Real eggs are not homogeneous spheres, and cooking conditions vary. Do not use elapsed time alone to establish food safety; follow applicable food-safety guidance and use temperature measurement where required.
Sources and method references
Fix an input or unexpected result
Egg mass (g) is required. Enter egg mass (g) using the format and bounds in the input table. Zero and an empty field are different: use zero only if it is allowed and represents your data.
If your answer differs from the example, choose Reset and compare every field, including selected units and options. Check percentage versus decimal entry and whether values describe the same period. Round only the final displayed answer when reproducing the formula.
If a discrepancy remains, report the calculator issue with the page address, non-sensitive example inputs, actual result, expected result and a reference for your calculation.