MEASURED QUANTITY SENSITIVITY

Formwork — form face height scenarios.

How does changing form face height affect formwork when the other inputs stay fixed?

What this decision changes

This measured quantity or supplied dimension enters the method on its stated unit basis. Other inputs stay fixed so its effect can be separated from net deductions, stock constraints or purchase rounding. Method basis: Purchase count is based on total board length and your allowance. It does not optimise cuts or specify bracing, joints or structural capacity.

The focus is form face height. All other shared inputs remain fixed for each evaluated range.

Perimeter = 2 × (L + W)Formwork Calculator

Evaluate your supplied alternatives

Start with your measured plan and selected product data. The initial values and range are illustrative. Each scenario changes only form face height; the other entered values stay fixed.

Display units

Measured plan and product inputs

Length

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Width

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Form face height

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Purchased board length

Where to get this value

Use the actual usable quantity or dimensions of the product you intend to buy. Check the label and the unit shown here.

Waste allowance

Shortcuts only; choose your own allowance above.

Where to get this value

Enter your own allowance. Presets are input shortcuts, not a construction recommendation.

Supplied comparison range for form face height

Lower supplied comparison value

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Upper supplied comparison value

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Nine evenly spaced values are evaluated. Whole counts are rounded to distinct integer scenarios. Values between the listed samples are not calculated.

9 evaluated scenarios

Baseline: Form boards — 7 boards. Rejected combinations remain visible below.

Quantity to plot

Each bar is one actual calculated form face area. Horizontal values: form face height in mm.

Form face height	Form face area	Change from baseline	Purchase result	Use this scenario
60 mm	1.08 m²	-0.72 m²	7 boards	Open in calculator Exact quantity breakdown Perimeter 18 m Form face area 1.08 m² Length with allowance 19.8 m
72.5 mm	1.305 m²	-0.495 m²	7 boards	Open in calculator Exact quantity breakdown Perimeter 18 m Form face area 1.305 m² Length with allowance 19.8 m
85 mm	1.53 m²	-0.27 m²	7 boards	Open in calculator Exact quantity breakdown Perimeter 18 m Form face area 1.53 m² Length with allowance 19.8 m
97.5 mm	1.755 m²	-0.045 m²	7 boards	Open in calculator Exact quantity breakdown Perimeter 18 m Form face area 1.755 m² Length with allowance 19.8 m
110 mm	1.98 m²	0.18 m²	7 boards	Open in calculator Exact quantity breakdown Perimeter 18 m Form face area 1.98 m² Length with allowance 19.8 m
122.5 mm	2.205 m²	0.405 m²	7 boards	Open in calculator Exact quantity breakdown Perimeter 18 m Form face area 2.205 m² Length with allowance 19.8 m
135 mm	2.43 m²	0.63 m²	7 boards	Open in calculator Exact quantity breakdown Perimeter 18 m Form face area 2.43 m² Length with allowance 19.8 m
147.5 mm	2.655 m²	0.855 m²	7 boards	Open in calculator Exact quantity breakdown Perimeter 18 m Form face area 2.655 m² Length with allowance 19.8 m
160 mm	2.88 m²	1.08 m²	7 boards	Open in calculator Exact quantity breakdown Perimeter 18 m Form face area 2.88 m² Length with allowance 19.8 m

Read the evaluated results

Read calculated demand, whole purchases and exact detail lines separately. This specific input may change quantity continuously, cross a purchase step or make the stated geometry or stock fit invalid.

Replace every illustrative baseline measurement and selected product value with the inputs for your actual task.
Enter a comparison range on the focused input's stated unit and quantity basis.
Review rejected combinations and use the exact detail lines to distinguish measured demand from whole purchases.
Open an evaluated scenario in the full calculator to save its original inputs and quantity breakdown to a browser material project.

Keep the comparison within scope

Compare measurements or already specified alternatives. Quantity sensitivity does not establish material suitability or construction requirements.

Only quantities from supplied dimensions and specifications are calculated.

No material-property reference values are bundled; obtain product values from the selected supplier's data sheet.

Only the listed samples are evaluated. Intermediate values, alternate constraints and global cutting optimality are not inferred from the graph.

Continue with this quantity method

Formwork Calculator

Other independent input decisions

Prepare the actual material data

Read the measurement and purchase guides

Quantity method and illustrative scenarios checked 6 October 2026. Methods and scope.