A familiar situation
Erhalten Sie eine erste Größenordnung für die Heiz- oder Kühlleistung eines Raums.
How to use this calculator
- Enter room area, load factor.
- Select Calculate to see the answer and its breakdown.
- Keep a scenario, change an input and compare the results.
Use consistent units and check the assumptions below before applying the result.
How btu is calculated
Estimate heating or cooling capacity in BTU per hour from room area and an adjustable load factor. The result is a screening estimate only; insulation, windows, ceiling height, climate, occupancy, and equipment efficiency can change a real load calculation substantially. A 400 ft² room at 25 BTU/h per ft² estimates 10,000 BTU/h. The calculation validates each input and keeps its stated units explicit. No. A Manual J or equivalent building-load assessment uses construction, climate, windows, and other inputs. This is an estimate for the stated assumptions; confirm measurements and any applicable professional or local standards before relying on it.
BTU Calculator is calculated from the supplied measurement fields using the units shown.A 400 ft² room at 25 BTU/h per ft² estimates 10,000 BTU/h.
Assumptions & useful context
Screening estimate only; a building load calculation is more reliable.
Frequently asked questions
Is area alone enough for HVAC sizing?
No. A Manual J or equivalent building-load assessment uses construction, climate, windows, and other inputs.
What is a BTU?
A British thermal unit is a unit of heat energy; BTU/h expresses a rate of heat transfer.