Stud Calculator
Estimate framing studs with extra pieces for corners and openings.
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What this tool does
Estimate framing studs with extra pieces for corners and openings. This is a count estimate, not a header or load-bearing wall design.
How to use the Stud Calculator
- Enter or select wall length in ft.
- Enter or select stud center spacing in in.
- Enter or select additional corner studs.
- Enter or select additional opening studs.
- Enter or select waste allowance (%).
- Read the calculated result; change any measurement to compare alternatives.
Formula
studs=ceil((ceil(length×12/spacing)+1+corners+openings)×(1+waste/100))
- length
- Wall length (ft, before metric conversion)
- spacing
- Stud center spacing (in, before metric conversion)
- corners
- Additional corner studs
- openings
- Additional opening studs
- waste
- Waste allowance (%)
This is a count estimate, not a header or load-bearing wall design.
Worked example
For stud calculator, the following measurements illustrate the exact method: Wall length: 20; Stud center spacing: 16; Additional corner studs: 2; Additional opening studs: 4; Waste allowance (%): 10.
Inputs
- Wall length20 ft
- Stud center spacing16 in
- Additional corner studs2
- Additional opening studs4
- Waste allowance (%)10
Result
- Studs to buy25
Results explained
- Studs to buy
- Studs to buy from the formula above. This is a count estimate, not a header or load-bearing wall design.
Frequently asked questions
Count spacing intervals plus both ends, add your opening/corner extras and apply waste.
Use wall length, center spacing and the extra pieces required by your framing plan.
Use 5–10% for simple layouts and 10–15% for diagonal cuts or complicated outlines; the allowance is editable.
Split the outline into rectangles or triangles and calculate each section separately. Do not count overlapping sections twice.
This is a purchasing estimate, not a structural design. Confirm measurements and local requirements before buying or building.