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BTU Calculator

Climate Zone

Room Length (ft)

Room Width (ft)

Ceiling Height (ft)

Result

—BTU/hr

◆ LIVE 3D PREVIEW

Tonnage

—

Room Size

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How to Calculate Btu

Use this free btu calculator to get instant, accurate results for your construction project. Simply enter your measurements above and the calculator will automatically compute the result using industry-standard formulas.

Pro Tip: Always add 10-15% extra material to account for waste, cuts, and job-site conditions. This is standard practice recommended by experienced contractors.

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💡 Pro Tips — Btu

Always add 10% extra material for waste, cuts, and mistakes.
Measure twice, order once. Returns cost time and money.
Buy all materials at once — batch orders often qualify for contractor discounts.
Check local building codes before starting any construction project.

❓ Frequently Asked Questions

+How many BTU per square foot?

20-25 BTU/sq ft for mild climates, 30-40 for moderate, 40-60 for extreme heat or cold.

+What size AC do I need?

Rough guide: 1 ton per 500-600 sq ft. Actual sizing requires Manual J load calculation for accuracy.

+How often to change filters?

1" filters: every 1-3 months. 4" filters: every 6-12 months. Homes with pets: change more frequently.

+What SEER rating should I get?

Minimum is 14-15 SEER (varies by region). 16-20 SEER offers good efficiency. 20+ SEER is premium with highest savings.

BTU Calculator

How to Calculate Btu

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💡 Pro Tips — Btu

❓ Frequently Asked Questions