Exit Sign Coverage Calculator

Calculate exit sign placement, viewing distance, and code compliance for means-of-egress per NFPA 101, IBC, and IFC. Determines maximum viewing distance based on letter height and minimum illuminance requirements.

Exit Sign Specification

Letter Height 6 in

Sign Type

Mounting Position

Stroke Width Ratio

Corridor / Space Length 100 ft

Ceiling Height 9 ft

Occupancy Load 50 persons

Number of Exits

Coverage & Placement

Max viewing distance—

NFPA 101 formula (100 × letter ht)—

Signs needed for space length—

Recommended spacing—

Min required exits (IBC)—

Illuminance at face—

Battery duration required—

Low-location sign required?—

Self-luminous / photolum OK?—

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ft max dist

Viewing distance

—

signs needed

For space length

—

fc face

Illuminance

—

min battery

Backup duration

Code Compliance Checklist — NFPA 101 / IBC §1013

Letter height ≥ 6 in (NFPA 101 §7.10.1.2)—

Stroke width ≥ ¾ in (1:5 to 1:10 ratio)—

Internally illuminated ≥ 5 fc (IBC §1013.5)—

Externally illuminated ≥ 5 fc on face—

Emergency power ≥ 90 min (NFPA 101 §7.10.4)—

Continuous operation during normal power—

Visible from any point on egress path—