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Door Header Length Planning Calculator — result sheet
Calculate a preliminary header cut length from opening width, bearing on each side, and a cutting allowance.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: preliminary header length=opening width+2×bearing per side+cut allowance.
The result is a cut-list length estimate only. Header depth, ply count, species, load path, snow/wind, span tables, masonry support, and local code must be designed separately.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Clear opening width — minimum 0.001; maximum 1000
- Bearing allowance per side — minimum 0; maximum 100
- Cut/fitting allowance — minimum 0; maximum 100
Worked example
| Input | Value |
|---|---|
| Clear opening width | 0.9 |
| Bearing allowance per side | 0.1 |
| Cut/fitting allowance | 0.01 |
Preliminary header length=1.11 length units.
Assumptions and limits
- All lengths use one consistent unit.
- The entered bearing and allowance are planning values.
- This calculator does not size a structural member or approve an opening.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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