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Calculation of Heating per Square Meter (m²)

The calculation of heating per m² in Kilocalories per hour (Kcal/h) or Watt (W) depends on the outdoor temperature. Below is a table to determine the required heating, based on the area of the space and the outdoor temperature.

Kcal/h per Square Meter (m²) Table:

Area (m²)Temp. Exterior between (5°C and 12°C)Temp. Exterior between (-5°C and 5°C)Temp. Exterior between (-15°C and -5°C)
4 m²400 Kcal/h500 Kcal/h600 Kcal/h
6 m²600 Kcal/h750 Kcal/h900 Kcal/h
8 m²800 Kcal/h1000 Kcal/h1200 Kcal/h
10 m²1000 Kcal/h1250 Kcal/h1500 Kcal/h
12 m²1200 Kcal/h1500 Kcal/h1800 Kcal/h
14 m²1400 Kcal/h1750 Kcal/h2100 Kcal/h
16 m²1600 Kcal/h2000 Kcal/h2400 Kcal/h
18 m²1800 Kcal/h2250 Kcal/h2700 Kcal/h
20 m²2000 Kcal/h2500 Kcal/h3000 Kcal/h
22 m²2200 Kcal/h2750 Kcal/h3300 Kcal/h
24 m²2400 Kcal/h3000 Kcal/h3600 Kcal/h
26 m²2600 Kcal/h3250 Kcal/h3900 Kcal/h
28 m²2800 Kcal/h3500 Kcal/h4200 Kcal/h
30 m²3000 Kcal/h3750 Kcal/h4500 Kcal/h
32 m²3200 Kcal/h4000 Kcal/h4800 Kcal/h
34 m²3400 Kcal/h4250 Kcal/h5100 Kcal/h
36 m²3600 Kcal/h4500 Kcal/h5400 Kcal/h
38 m²3800 Kcal/h4750 Kcal/h5700 Kcal/h
40 m²4000 Kcal/h5000 Kcal/h6000 Kcal/h
42 m²4200 Kcal/h5250 Kcal/h6300 Kcal/h
44 m²4400 Kcal/h5500 Kcal/h6600 Kcal/h
46 m²4600 Kcal/h5750 Kcal/h6900 Kcal/h
48 m²4800 Kcal/h6000 Kcal/h7200 Kcal/h
50 m²5000 Kcal/h6250 Kcal/h7500 Kcal/h
52 m²5200 Kcal/h6500 Kcal/h7800 Kcal/h
54 m²5400 Kcal/h6750 Kcal/h8100 Kcal/h
56 m²5600 Kcal/h7000 Kcal/h8400 Kcal/h
58 m²5800 Kcal/h7250 Kcal/h8700 Kcal/h
60 m²6000 Kcal/h7500 Kcal/h9000 Kcal/h
62 m²6200 Kcal/h7750 Kcal/h9300 Kcal/h
64 m²6400 Kcal/h8000 Kcal/h9600 Kcal/h
66 m²6600 Kcal/h8250 Kcal/h9900 Kcal/h
68 m²6800 Kcal/h8500 Kcal/h10200 Kcal/h
70 m²7000 Kcal/h8750 Kcal/h10500 Kcal/h
72 m²7200 Kcal/h9000 Kcal/h10800 Kcal/h
74 m²7400 Kcal/h9250 Kcal/h11100 Kcal/h
76 m²7600 Kcal/h9500 Kcal/h11400 Kcal/h
78 m²7800 Kcal/h9750 Kcal/h11700 Kcal/h
80 m²8000 Kcal/h10000 Kcal/h12000 Kcal/h

Heating Power Table in Watts (W) per Square Meter:

The unit for measuring heat or heating power in the international system is the Watt (W). Below is the table of power in W per m² and the exterior temperature.

Area (m²)Temp. Exterior between (5°C and 12°C)Temp. Exterior between (-5°C and 5°C)Temp. Exterior between (-15°C and -5°C)
4 m²465.12 W581.40 W697.67 W
6 m²516.00 W872.09 W1046.51 W
8 m²688.00 W1162.79 W1395.35 W
10 m²860.00 W1453.49 W1744.19 W
12 m²1032.00 W1744.19 W2093.02 W
14 m²1204.00 W2034.88 W2441.86 W
16 m²1376.00 W2325.58 W2790.70 W
18 m²1548.00 W2616.28 W3139.53 W
20 m²1720.00 W2906.98 W3488.37 W
22 m²1892.00 W3197.67 W3837.21 W
24 m²2064.00 W3488.37 W4186.05 W
26 m²2236.00 W3779.07 W4534.88 W
28 m²2408.00 W4069.77 W4883.72 W
30 m²2580.00 W4360.47 W5232.56 W
32 m²2752.00 W4651.16 W5581.40 W
34 m²2924.00 W4941.86 W5930.23 W
36 m²3096.00 W5232.56 W6279.07 W
38 m²3268.00 W5523.26 W6627.91 W
40 m²3440.00 W5813.95 W6976.74 W
42 m²3612.00 W6104.65 W7325.58 W

Use of the Automatic Heating Calculator:

When the area to be heated has specific characteristics that could influence the calculation, such as insulation details or air renewal rates, it is recommended to use an automatic heating power calculator. This type of tool considers a greater number of factors in the calculation.

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