HVAC & Plumbing Calculators

Estimate heating and cooling loads, size equipment and plan HVAC systems with confidence.

BTU Heating & Cooling

Estimate how many BTUs you need to heat or cool a room. Based on area, ceiling height, climate and insulation.

Accurate equipment sizing is the foundation of efficient HVAC design. Oversized units short-cycle and waste energy; undersized units struggle on design days. Our BTU calculator uses a simplified Manual J method to give you a solid ballpark figure before you pull out your full load-calculation software. For permitted work, always complete a full Manual J analysis.