Sign Letter HeightEnter how far away people read the sign and how high it hangs. Get the minimum letter height from ADA Table 703.5.5, compared with the 1 inch per 10 feet rule, on a live elevation with the sightline.

SheetT-44

StandardADA 2010 · 703.5.5

Unitsm, mm, inches

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Viewing distance m Letter baseline above floor m

Eye height m Rule of thumb mm per m

Sign text Letters you plan mm (0 = none)

Eye height: about 1.60 m standing, 1.20 m in a wheelchair. 8.3 mm per m is the sign-trade rule of 1 inch of letter for every 10 feet of distance.

ADA minimum–

In inches–

Rule of thumb–

Look-up angle–

Elevation

Distance	Baseline 1.0–1.8 m	1.8–3.05 m	Over 3.05 m	1 in / 10 ft