BTU Calculator

An HVAC (Heating, Ventilation, Air Conditioning) BTU calculator estimates the cooling or heating capacity needed for a room based on area, ceiling height, insulation, and climate. Use this calculator for accurate, instant results.

The calculator uses the standard published formula for hvac calc. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches, square feet, percentages. You can enter values in the units shown — the calculator handles all conversions internally.

The calculator applies the standard formula for this type of calculation. See the 'How It Works' steps above for the detailed formula breakdown.