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Source verifiedIBC 2024 §1006Count only

Required Exits
Space vs. Story

First identify whether the analysis is for an individual space or a story/occupiable roof. This bounded calculation never derives capacity width from story count.

Who it's for: architects determining the minimum number of exits or exit-access doorways for a space, story, or occupiable roof once the occupant load is known, at construction documents or permit review.

When it cannot answer
For spaces with 500 or fewer occupants, occupancy and common-path conditions are needed, so this preview returns “cannot determine.” It assumes no single-exit story exception has been established.

How to use this calculator

1
Choose the analysis scope
Select whether you're analyzing an individual space or a story/occupiable roof — the two scopes use separate tables.
2
Enter the occupant load
Enter the occupant load for that space or story.
3
Read the minimum exit count
The result is the minimum exit count implemented for that scope. Check it next against the single-exit exception (for stories) and against common-path, separation, and width requirements, which this calculator does not evaluate.

The formula

For an individual space above 500 occupants (IBC 2024 §1006.2.1.1): 3 exits or exit-access doorways for 501–1,000 occupants, 4 above 1,000. For a story or occupiable roof without a confirmed single-exit exception (Table 1006.3.3): 2 exits up to 500 occupants, 3 for 501–1,000, 4 above 1,000.

Worked example

Example
A story with an occupant load of 600: 600 falls in the 501–1,000 range of Table 1006.3.3, so the minimum is 3 exits or access to exits.

When this estimate will be off

  • Does not evaluate single-exit exceptions, common path, separation, width, distribution, accessibility, local amendments, or complete compliance.
  • Assumes no single-exit story exception has been established.
  • For an individual space with 500 or fewer occupants, occupancy classification and common-path conditions are needed, so this calculator returns "cannot determine" rather than guessing at a single-exit answer.

Frequently asked questions

A common mistake: Does not evaluate single-exit exceptions, common path, separation, width, distribution, accessibility, local amendments, or complete compliance.

Below that threshold, IBC 2024 §1006.2.1 requires occupancy classification and common-path conditions this calculator does not evaluate, so it returns "cannot determine" rather than guessing at a single-exit answer.

An individual space's exit count is governed by §1006.2.1.1; a story or occupiable roof's exit count is governed by §1006.3.3 and assumes no single-exit exception has been established — pick the scope that matches what you're analyzing.

No. It assumes no single-exit story exception applies. Confirm §1006.3.4 exception eligibility separately before relying on a single exit.

Sources and review record

Sources and method basis

Limitations

  • Separates individual-space and story/roof scope; does not establish single-exit exceptions, common path, separation, distribution, capacity, or complete compliance.

This free IBC Required Exits Calculator is built and maintained by DataDrivenAEC, using the relevant codes and standards. It does not substitute for professional judgment.