TapeMath
HomeToolsOn-center layout › 16" OC · 8 ft

16" on center, 8 ft wall

Stud, joist and deck-board layout for a 8-foot run at 16" on center — how many pieces, and where every mark lands measured from the end of the plate.

8 ft wall @ 16" O.C. =
=7 studs
Studs / joists
7
Bays
6
Spacing
16" O.C.
Wall length
8' 0"
How many
A 8-foot wall is 96" long. At 16" on center that's ceil(96 ÷ 16) = 6 bays, and one more stud than bays for the end — 6 + 1 = 7 studs. The same count and marks lay out floor joists or deck boards on the same spacing.
Pull the tape

Every mark from the end

Stud #Mark (from end of plate)
10" (end)
21' 4"
32' 8"
44' 0"
55' 4"
66' 8"
78' 0"
The same math, offline

Every calc, on your tape measure — even with no signal.

TapeMath for iPhone runs this exact engine offline, adds rafters, stairs, studs, pitch and a paperless tape, and the key layout your thumbs already know. $9.99 once — no subscription, ever.

See the app
Coming soon — TapeMath is in final App Review. Meanwhile, use the free web calculator