Free Tool

Sign Size & Area Calculator

Calculate your sign area, see how it compares to zone limits, and find the maximum your building frontage allows.

1. Calculate Your Sign Area

Enter dimensions to get the square footage used in permit applications.

Most cities measure as smallest enclosing rectangle
Most codes count only one face of a two-sided sign

2. Check Against Zone Limits

Compare your sign area to typical allowances for each zone type.

3. Maximum Sign Area by Frontage

Many cities tie your maximum sign area to your building's street frontage length.

Length of your building facing the street

Reference: Typical Zone Sign Limits

Common patterns across 200+ U.S. municipalities — verify your city's specific rules.

ZoneTypical Max AreaFreestanding?Illumination
Residential (home occ.)1–4 sq ftNoUsually prohibited
Neighborhood Commercial20–50 sq ftMonument ≤6 ftLimited hours
General Commercial (C-2)50–150 sq ftMonument or pole ≤20 ftPermitted
Heavy Commercial (C-3)100–300 sq ftPole/pylon ≤35 ftIncl. digital
Office / Business Park20–60 sq ftMonument ≤6 ftSubtle only
Mixed-Use / Urban30–80 sq ftGround sign ≤5 ftNo digital
Downtown / CBDVaries widelyOften prohibitedPermitted
Industrial50–200 sq ftPermitted ≤25 ftPermitted
Historic District20–40 sq ftVery limitedRestricted
Diagrams showing how to measure sign area for four sign types: channel letters, cabinet sign, monument sign, and double-faced sign
Sign area is almost always measured as the area of the smallest rectangle enclosing all sign elements — not the area of the letters themselves.
Next steps: Use our fee estimator to budget for permit costs, or the permit checker to confirm whether a permit is required.

Not a substitute for verification with your local planning department. Sign area measurement rules vary by jurisdiction.