Water Temperature Calculator
Calculate water mixing ratio.
혼합 비율
Overview
The Water Temperature Calculator determines the exact ratio of hot and cold water to mix in order to reach a target temperature. Essential for coffee and tea brewing, yeast activation in baking, baby formula preparation, and dough temperature control — anywhere precise water temperature matters.
Formula
Heat balance equation: (Hot water temp x Hot water amount) + (Cold water temp x Cold water amount) = Target temp x Total amount. Cold water amount = Total amount x (Hot temp - Target temp) / (Hot temp - Cold temp). Example: Mixing 100C and 20C water to get 60C in 500ml -> 250ml hot + 250ml cold.
How to Use
- 1Enter the available hot water temperature.
- 2Enter the available cold water temperature.
- 3Enter the desired target temperature.
- 4Enter the total amount of water needed.
- 5View the calculated amounts of hot and cold water to mix.
Tips
- ✔Optimal coffee brewing temperature is 92-96C (197-205F). Let boiling water cool for 30 seconds to 1 minute to reach approximately 93-95C.
- ✔Green tea: 70-80C, Black tea: 95-100C, Oolong tea: 85-95C.
- ✔Yeast activates best at 38-43C (100-110F). Water above 55C (130F) kills yeast.
- ✔For baby formula, dissolve powder in water above 70C (158F) first, then add cold water to cool to body temperature (36-37C).
FAQ
Q. What is the optimal water temperature for coffee?
The SCA (Specialty Coffee Association) recommends 92-96C (197-205F). This range extracts the most balanced flavor compounds. Below 90C, under-extraction causes excessive acidity. Above 98C, over-extraction produces bitterness. Pour-over and French press both perform best in this range.
Q. Can I estimate water temperature without a thermometer?
Rough estimates are possible. Boiling water (100C) poured into a ceramic cup drops to about 90-93C. After 1 minute it is about 85C, after 3 minutes about 75C. If you can keep your finger in the water for 10 seconds, it is about 50-55C. If comfortable to submerge, it is about 40-45C.
Q. Why does water temperature matter in bread dough?
The final dough temperature (ideally 24-27C / 75-80F) directly affects fermentation quality. Mixing generates friction heat, so water temperature compensates to hit the target. The formula is: Water temp = (Target dough temp x 3) - Flour temp - Room temp - Friction factor.
Related Calculators
Recipe Scaler
Scale recipe ingredients for different serving sizes.
Tip Calculator
Calculate tip amount and per-person cost for a meal.
Food Calorie Counter
Look up calories for common foods and calculate totals.
Baking Conversion Calculator
Convert between cups, grams, tablespoons and other baking units.
Coffee Ratio Calculator
Calculate optimal coffee-to-water ratio.
Alcohol Dilution Calculator
Calculate water needed to dilute alcohol to a target ABV.