Garage Heat Lab

Garage Heat Lab is a free online garage heater calculator that helps homeowners, DIYers, and workshop owners estimate heating requirements before choosing a heater.

Enter garage dimensions, ceiling height, insulation level, outdoor temperature, and target indoor temperature to estimate required BTU/hr, equivalent electric watts, and an appropriate heater size.

The site also provides BTU reference guides, running-cost tools, and practical garage heating resources. No account or email signup is required.