About FirewoodCal

FirewoodCal is a free resource for homeowners who heat with wood. We provide accurate, data-driven tools to help you make informed decisions about your heating fuel.

Our Data

All BTU values, density measurements, and species characteristics are sourced from USDA Forest Service publications, university forestry extension programs, and peer-reviewed research. We reference data from institutions including the University of Missouri Extension, Utah State University Forestry Extension, and the USDA Forest Products Laboratory.

Our Calculators

Our three calculators address the most common questions homeowners have about firewood:

• BTU Calculator — Compare heat output across 40+ wood species
• Cord Calculator — Estimate how much wood you need based on your home and climate
• Cost Comparison — Compare firewood costs against propane, oil, gas, and electricity

Disclaimer

Calculations are estimates based on published averages. Actual BTU output varies based on moisture content, specific gravity variation within species, and individual wood characteristics. Always ensure your wood is properly seasoned (below 20% moisture content) for optimal performance and safety. Consult a certified chimney professional for installation and maintenance of wood-burning appliances.

Contact

Have a question, correction, or suggestion? We welcome feedback at contact@firewoodcal.com.