Watts to Heat Calculator

Your details

Forward: given power and duration, find heat. Reverse: given temperature target, find required power.
Electrical or thermal power output of the heating device.
W
For resistive electric heaters, use 100%. For gas or heat-pump, adjust accordingly.
%
How long the heater runs.
min
Choose the material being heated. Specific heat capacity is filled in automatically.
The mass of the material being heated.
kg
Heat energy produced
600

Total thermal energy delivered by the heater

Energy unitkJ
Temperature rise143.47
Temp rise unit°C
Effective heat power1,000W
Heat output3,412.14BTU/hr
Total energy unitkJ
143.47 °C
Mild rise<20Moderate rise20-50High rise50+

600.00 kJ of heat produced, raising temperature by 143.5 °C.

  • The heater delivers 600.000 kJ of thermal energy over the heating period.
  • Water (liquid, 25 °C) rises by approximately 143.47 °C.
  • The effective thermal output is 3412.1 BTU/hr (1000 W).

Next stepTo find the wattage you need to reach a target temperature, switch to "Target temperature rise" mode.

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