Steepanto

Temperatures, times and ratios for brewing tea at home.

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Water temperature mixer

Find how much boiling and cold water to combine to reach the brewing temperature you want.

This is a simplified heat balance: it assumes the same specific heat for both waters and no heat loss. The cold vessel and the air will lower the real temperature, so confirm the result with a thermometer.

Enter your values, then calculate.

Method and limitations

Hot water volume = final volume × (target − cold) ÷ (hot − cold); cold water volume = final volume − hot water volume. The three temperatures must use the same unit. Fahrenheit values are converted to Celsius with (°F − 32) × 5 ÷ 9, and US fluid ounces with 1 US fl oz = 29.5735295625 ml. The target must lie strictly between the cold and hot water temperatures, and the hot water must be warmer than the cold. Volumes are rounded to the nearest millilitre, or to one decimal place in US fluid ounces.

Sources

No external reference is documented for this calculation; its method and limitations are described above.