Estimate AC BTU size from room dimensions and heat load.
Quick planning, rough comparisons, and checking whether your assumptions are in the right range before you rely on final quotes or advice.
Review the assumptions below, then compare with related calculators if your decision depends on rates, eligibility, or provider-specific rules.
How this calculator works
- Room volume is converted into a rough cooling load estimate.
- Sun exposure adjusts the recommended BTU upward or downward.
- The result is a practical sizing guide rather than an HVAC design calculation.
Worked example
Bigger rooms with higher ceilings and direct sun need more BTU capacity.
Important assumptions
- Appliance loads, glazing, and insulation are simplified.
- Professional sizing may differ for difficult spaces.
FAQ
Are these calculators free?
Yes. lankacalculator tools are free to use and designed to be quick to access without sign-up.
How accurate are the results?
The calculators use clear assumptions and formulas, but results are estimates and should be checked against official documents or provider terms.
Can I use this on mobile?
Yes. The layout is built to work cleanly on phones, tablets, and desktops.
Do you store my inputs?
No account is required for these tools, and calculator inputs are not stored as user profiles in this v1 setup.