Sqratch Tools / MEP Systems / AC Tonnage Estimator
AC Tonnage Estimator
Estimate your cooling requirements by providing your room's floor area, ceiling height, and sun exposure. Get the required AC tonnage and BTU in an instant.
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Basis & Assumptions
- Rule of thumb: ~20 BTU/hr of cooling per square foot of floor area (1 ton ≈ 400–600 sq ft), scaled for ceiling height against a ~2.7 m (9 ft) standard.
- Adjusts ±10% based on high or low solar heat gain (sun exposure).
- This is a rough estimate only. Proper HVAC sizing requires a full ACCA Manual J heat-load calculation.
For quick design checks and study — not a substitute for your local Development Control Regulations, NBC provisions, or a licensed professional's judgement. Always verify against the bye-laws that apply to your site.
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