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Calculators / Construction / Heating BTU estimate
Heating BTU estimate calculator
Estimate hourly heat input from floor area and a chosen load factor.
On this page
Estimated heat input25,000BTU/h
Calculator controls
How to calculate
Estimate hourly heat input from floor area and a chosen load factor.
Estimated heat input = area*factor
Worked example
Floor area: 1000; Heat-load factor (BTU/h per area unit): 25.
Estimated heat input: 25,000 BTU/h.
Assumptions and limits
A proper load calculation considers climate, insulation, glazing, air leakage, orientation and ventilation.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Estimate hourly heat input from floor area and a chosen load factor. The displayed figures use the inputs and formula shown on this page.
When this tool is useful
Use the heating btu estimate to compare a scenario, check an estimate, or verify a manual calculation.
Understanding your inputs
| Input | What to enter |
|---|---|
| Floor area | Enter a number of at least 0.000001 and no more than 1000000000000. |
| Heat-load factor (BTU/h per area unit) | Enter a number of at least 0.000001 and no more than 1000000000000. |
Frequently asked questions
What should I check before using the heating btu estimate result?
A proper load calculation considers climate, insulation, glazing, air leakage, orientation and ventilation.
Is this heating btu estimate result exact?
It is exact for the stated mathematical model and entered values. Real-world results can differ when rates, timing, fees, definitions or measurement conditions differ.