BTU Calculator

Calculate BTU for heating and cooling

Length (ft)

Width (ft)

Height (ft)

Insulation Level

Sun Exposure

Room: 12×12×8 ft · 1152 ft³

How It Works

Convert between BTU and other energy units including joules, kWh, calories, and more.

A BTU converter translates energy measurements between British Thermal Units and other common energy units. BTU is traditionally used in heating and cooling systems to describe thermal capacity. Converting between units helps compare energy usage across different appliances and measurement systems. The conversion factors between BTU and metric units are precisely defined.

Results

Enter values to see results

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Quick Tips

• Results update automatically as you type
• Use Tab to navigate between fields
• Press Enter to calculate

Frequently Asked Questions

How does the BTU Calculator work?

Simply enter your values into the input fields above. The BTU Calculator uses standard formulas to compute results instantly as you type or click.

Is the BTU Calculator free?

Yes, this calculator is completely free to use. No registration, no hidden fees, no limits.

How accurate are the results?

Results are computed using industry-standard mathematical formulas. For critical decisions, we recommend consulting a professional.

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