IBC Allowable Building Area Calculator

Calculate maximum allowable building area per story per IBC Table 506.2 based on occupancy and construction type.

Input Parameters

Results

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Tabular Area (At)
sq ft
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Max Stories Allowed
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Total Building Area
sq ft
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Sprinkler Required
Note: Values shown are base tabular areas WITHOUT modifications. Additional area may be allowed with frontage increases (If) and sprinkler increases (Is) per IBC Section 506.2. Always verify with the specific code edition adopted in your jurisdiction.

Reference

IBC Table 506.2 - Allowable Building Area (sq ft per story) Base tabular area (At) depends on occupancy group and construction type. Total building area = At x number of stories (limited by Table 504.3) Type I-A generally allows unlimited area for most occupancies. Area increases available per Section 506.2 (frontage, sprinkler).