BTU Heating Calculator
The BTU Heating Calculator computes btu heating from the relation heating load BTU per hour = floor area sq ft x BTU per sq ft. It takes 2 inputs (floor area to heat in sq ft, heating factor in BTU per sq ft) and returns the btu heating. These calculators are for homeowners, renovators, builders, landscapers and tradespeople planning work on a house, yard or site, covering how much material an area will take, how a layout, slope or frame should be set out, and what size or capacity a room, tank or system needs before anything is bought or built. Enter your values below and the result updates instantly, and you can share a permalink that pre-fills the exact calculation. Measure the real space rather than working from nominal figures on a plan, and keep every length, area and volume in one unit system before entering it so feet and metres never get mixed. Where the result is material to buy, treat it as a starting figure and round up, because bags, sheets, rolls and panels come in fixed sizes and some of every order goes to offcuts, breakage and second coats; where the result is a dose, load or size rating, use it as calculated rather than padding it. For example, with floor area to heat = 1500 sq ft, heating factor = 40 BTU per sq ft, the btu heating works out to 60000, and the worked example further down the page shows every step so you can follow the arithmetic and reproduce it by hand. The method is the standard form documented by ENERGY STAR (US EPA), and the figure above each result carries the date it was last verified. These are planning figures, not a structural, electrical or safety check. What a job actually consumes shifts with substrate porosity, compaction, ground conditions, waste and each product's own coverage or dose rating, so confirm the final quantity against the product details or with your supplier before ordering, and have any load-bearing, electrical, gas or drainage work designed and checked by a qualified professional.
With Floor area to heat = 1500 sq ft, Heating factor = 40 BTU per sq ft, the result is 60000.
Applies to: any numeric inputs. Method source: ENERGY STAR (US EPA), checked 2026-06-23.
The formula
heating load BTU per hour = floor area sq ft x BTU per sq ft
Worked example
With Floor area to heat = 1500 sq ft, Heating factor = 40 BTU per sq ft:
- heating load = 1500 sq ft x 40 BTU per sq ft
- heating load = 60000 BTU per hour
- BTU Heating = 60000
This worked example is one of the automated golden-value tests this calculator must pass before it can publish.
What this assumes
- Inputs are real numbers in the units shown.
- The result is the exact value of heating load BTU per hour = floor area sq ft x BTU per sq ft; general information, not professional advice.
Frequently asked questions
What formula does this use?
heating load BTU per hour = floor area sq ft x BTU per sq ft, the standard form documented by ENERGY STAR (US EPA).
Does the result ever change over time?
No. This is a pure formula with no external rate, so the same inputs always give the same result.
Official sources and verification
- Method: ENERGY STAR (US EPA), checked 2026-06-23.
Reviewed by the CalculatorHub team, edited by James Graham, 2026-06-23. See our methodology. General information, not professional advice.