Garage Heat Lab — Garage Heater Size Calculator
garageheatlab.com
ProductivityFree garage heater calculator that estimates BTU/hr, electric watts, and heater size from garage dimensions, insulation, climate, and target temperature.
About
Garage Heat Lab — Garage Heater Size Calculator
Garage Heat Lab is a free online garage heater sizing tool for homeowners, DIYers, and workshop owners who need a practical starting point before choosing a heater.
Enter your garage dimensions, ceiling height, insulation level, outdoor design temperature, and desired indoor temperature to estimate the required BTU/hr, equivalent electric heating capacity, and an appropriate standard heater size.
The site also provides garage heating guides, BTU reference information, and related calculators to help users compare heater sizes and estimate heating requirements. No account or email signup is required to use the calculator.
Updated October 2, 2026Community
Questions and feedback
Ask about Garage Heat Lab — Garage Heater Size Calculator or leave specific, constructive feedback for its owner.Start the conversation
Be the first to ask a question or share useful feedback with the maker.