Wall Heater Size Calculator

Here’s a table estimating the size of wall heaters based on the square footage of a room. The sizes are estimated in terms of wattage, which is a common measure for electric wall heaters.

Room Size (sq ft)	Heater Size (watts)	Heater Size (BTUs)
100	500	1706
200	1000	3412
300	1500	5118
400	2000	6824
500	2500	8530
600	3000	10236
700	3500	11942
800	4000	13648
900	4500	15354
1000	5000	17060
1200	6000	20472
1400	7000	23884
1600	8000	27296
1800	9000	30708
2000	10000	34120