BTU Calculator

1. Number of square feet

Calculate the number of cubic feet to heat

Width (ft)

Length (ft)

Height (ft)

Number of square feet

2. Temperature difference factor

Calculate the the temperature difference factor (˚C)

Outdoor temperature

Desired indoor temperature

Difference

Temperature difference factor

3. Insulation factor

Calculate the insulation factor of the space to heat

Insulated

Closed space. Doors and windows installed.

Well insulated

Enclosed space. Walls erected but not insulated. Doors and windows covered with plastic sheeting or tarps.

Poorly insulated

Partially open space. Many walls erected.

Not insulated

Open space. Main walls not erected.

Factor

Result

Calculate the required number of BTUs

1. Number of square feet

0 pi

2. Temperature difference factor

3. Insulation factor

Required number of BTUs

1. Number of square feet

Calculate the number of cubic feet​ to heat

Width (​ft)

Length (​ft)

Height (​ft)

Number of ​square feet

2. Temperature difference factor

Calculate the the temperature difference factor (˚C)

Outdoor temperature

Desired indoor temperature

Difference

Temperature difference factor

3. Insulation factor

Calculate the insulation factor of the space to heat

Insulated

Well insulated

Poorly insulated

Not insulated

Factor

Result

Calculate the required number of BTUs

1. Number of square feet

2. Temperature difference factor

3. Insulation factor

Required number of BTUs

Calculate the number of cubic feet to heat

Width (ft)

Length (ft)

Height (ft)

Number of square feet