Framing Calculator
Estimate base studs, studs to buy, and total stud cost for a wall.
Common OC spacings: 400 mm, 406.4 mm (16″), 487.68 mm (19.2″), 609.6 mm (24″).
Waste helps cover offcuts, defects, and mistakes. Many builds use around 10% to 15%.
- Convert wall length and spacing to meters.
- Base studs =
ceil(L / s) + 1so both ends are studded even when the length is not an exact spacing multiple. - Studs to buy =
ceil(base studs × (1 + waste)). - Total cost =
studs to buy × price per stud.
- This estimates studs along one straight wall run only.
- Door openings, corners, extra kings/jacks, plates, and blocking are not included.
- Waste is applied to the stud quantity you buy, then rounded up to whole studs.
Use this Framing Calculator to estimate the number of vertical studs needed for a straight wall, including an optional waste allowance and material cost.
Framing Calculation Method
Base studs = ceil(wall length ÷ on-center spacing) + 1
The result is rounded up, and one additional stud is added so both ends of the wall are included.
To include waste:
Studs to buy = ceil(base studs × (1 + waste percentage ÷ 100))
When a price per stud is entered:
Total cost = studs to buy × price per stud
On-center (OC) spacing means the distance from the center of one stud to the center of the next.
Example
Suppose a wall is 16 ft long with studs spaced 16 inches on-center and a 10% waste allowance.
Convert the wall length to inches:
16 ft × 12 = 192 inches
Base studs = ceil(192 ÷ 16) + 1
Base studs = 12 + 1 = 13 studs
Add 10% waste:
Studs to buy = ceil(13 × 1.10) = 15 studs
The estimated purchase quantity is therefore 15 studs.
Important Notes
- This calculator estimates regular vertical studs along one straight wall only.
- Door and window openings may require additional king studs, jack studs, cripple studs, headers, and sills.
- Corners, intersecting walls, top and bottom plates, blocking, bracing, and other framing members are not included.
- Stud spacing such as 16 or 24 inches on-center must be suitable for the wall design, stud size, load, sheathing, and applicable building requirements.
- Use approved construction drawings and local building requirements for actual structural work.