Estimate the key quantities and planning outcome for a door replacement project using inputs you can adjust to match the property and proposed scope. The calculator separates the main result from supporting figures, making it easier to check contractor assumptions, compare options, and identify which input has the greatest effect. Results are planning estimates rather than a substitute for field measurements, product specifications, written bids, or local permit guidance.
The casing result includes the entered waste rate. Sealant assumes 20 linear feet per tube.
The main result summarizes the entered project scope, while the secondary figures expose the components behind it. Treat the estimate as a consistent comparison baseline and investigate any large difference between this result and a contractor proposal.
Actual requirements can change with field measurements, structural conditions, code, product instructions, disposal rules, taxes, labor practices, and the final contract scope.
Four 36 × 80 inch doors total 80 sq ft of opening area. One-side casing is 65.3 linear feet, or 71.9 linear feet with 10% waste; plan 4 sealant tubes.
No. Measure each rough opening and order each unit to its required specification; averages are for aggregate planning.
The formula section states the included perimeter or casing basis. Double a one-side casing result when both sides use the same profile.
It uses the stated planning coverage per tube; deep or wide joints can reduce actual coverage.
They are not counted individually. Use the adjusted perimeter to prepare a project-specific accessory list.
Sealant is purchased in whole tubes, so the calculated fraction is rounded up to avoid an incomplete last run.
| Output | Planning use |
|---|---|
| Opening area | Project scale and door surface comparison |
| Casing length | Two jamb legs plus head per door, one side |
| Sealant | Rounded-up planning quantity |