Stove size calculator
StoveRatings' planning range is heated square feet times a BTU-per-hour factor that depends on the band you pick.
For 2,000 square feet in the moderate band, 2,000 times 30 is 60,000 BTU/hr and 2,000 times 45 is 90,000 BTU/hr.
Those factors are ours, for an 8-foot ceiling, and they are not EPA figures or a room-by-room heat-loss calculation.
2,000 sq ft × 30 = 60,000 BTU/hr, and 2,000 sq ft × 45 = 90,000 BTU/hr. That is StoveRatings' planning range for this band, not an EPA figure.
The factors
| Band | When we mean it | Low factor | High factor |
|---|---|---|---|
| Mild | Winters usually stay above about 20°F | 20 | 30 |
| Moderate | Winters often fall between 0°F and 20°F | 30 | 45 |
| Cold | Winters often fall below 0°F | 45 | 60 |
| Severe | Long stretches well below 0°F, or a drafty building | 60 | 75 |
Formula: low BTU/hr = square feet × low factor. High BTU/hr = square feet × high factor. Compare a result with the heat-output range EPA listed for a model, which is a lab range, not the heat that will arrive in the room. The EPA snapshot date is 2026-10-23.
Use the finder to see those EPA heat-output ranges.