Furnace BTU Calculator
Estimate heating capacity by square footage and climate zone
How It Works
Formula:
BTU Estimate = Square Feet × (Zone BTU per sq ft)
Where:
- • Square Feet = Area of the space
- • Zone BTU per sq ft = Range based on climate
Purpose:
Estimates the heating capacity (BTU/hr) needed for a space using BTU-per-sq-ft ranges by climate zone. This provides a quick reference for sizing heating equipment.
Disclaimer
The equipment capacities shown are provided as general reference and are intended for informational use only. These values are not guaranteed for accuracy and may be influenced by site-specific or external conditions. For precise calculations and optimal system design, consult a qualified HVAC design engineer who can account for your specific project requirements and conditions.