Formwork Area Calculator (m²/ft²)
Compute formwork area by member type and apply opening deduction rules to get net area.
Multipliers are reference values and are not costs (unit price × quantity).
Inputs
Length inputs are unified to mm for metric and in for imperial.
Top and bottom end faces are not included (adjust via multipliers or separate items if needed).
Substitution
Opening deductions (width × height)
| Width | Height | Qty | Area | Remove |
|---|
Opening deduction rules
Multiplier (optional)
Results
Show breakdown
Opening deductions (important)
Deduction conditions (small openings, one-side deductions, thresholds) vary by owner, company, and contract terms.
This tool provides common rule templates. Choose or edit them to match the project.
If uncertain, check the contract, quantity standards, or owner specifications.
This tool is a calculation aid and not a substitute for design, regulations, contracts, or safety requirements.
Preset values are examples and will vary by conditions.