Estimate how long it takes for your hot coffee or tea to reach the perfect drinking temperature.
Temperature Specs
Wait Time
Check your temperature values. Target must be between Initial and Ambient.
Overview
Based on Newton's Law of Cooling, the rate of temperature change of an object is proportional to the difference between its own temperature and the ambient temperature. This calculator helps you avoid burning your tongue!
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Pro Tips
If you're in a hurry, leave the spoon in the cup—the metal acts as a heat sink.
Blowing on your drink creates evaporative cooling, which is much faster than simple conduction.
A wide-mouthed cup (like a latte bowl) cools much faster than a tall, narrow one because of the larger surface area.
Pre-heating your mug with hot water prevents the mug itself from stealing heat from your drink.
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Fun Facts
"The 'Mpemba effect' is the observation that hot water can sometimes freeze faster than cold water."
"A black mug will cool down slightly faster than a white one due to better thermal radiation."
"Adding cold milk immediately to coffee actually keeps it warmer for longer because the temperature difference with the air becomes smaller."
"The ideal drinking temperature for coffee is generally cited as 130°F to 160°F (54°C to 71°C)."
