MEASURED QUANTITY SENSITIVITY

Combined concrete volumes — thickness scenarios.

How does changing thickness affect combined concrete volumes 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: Calculate each non-overlapping section from your specified footprint and thickness, add their volumes, and apply the allowance once to the combined pour. If a supplier order increment is entered, round the combined volume up once. A zero increment returns the unrounded requirement. This calculator does not choose slab thickness, reinforcement or a concrete mix.

The focus is thickness. All other shared inputs remain fixed for each evaluated range.

Order = round up(Σ(net area × thickness × count) × (1 + allowance) ÷ increment) × incrementConcrete 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 thickness; the other entered values stay fixed.

Display units

Measured plan and product inputs

Measure

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.

Thickness

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.

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.

Area to exclude

m²

Supplier volume order increment

m³

Enter 0 for an unrounded volume. Use the increment quoted by your supplier.

Supplied comparison range for thickness

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: Concrete to order — 2.2 m³. Rejected combinations remain visible below.

Quantity to plot

Each bar is one actual calculated concrete to order. Horizontal values: thickness in mm.

Thickness	Concrete to order	Change from baseline	Use this scenario
60 mm	1.32 m³	-0.88 m³	Open in calculator Exact quantity breakdown Net pour area 20 m² Calculated volume 1.2 m³ Waste allowance 0.12 m³ Supplier rounding surplus 0 m³ Dimensions come from your plan. Confirm order increments and the specification with your supplier.
72.5 mm	1.595 m³	-0.605 m³	Open in calculator Exact quantity breakdown Net pour area 20 m² Calculated volume 1.45 m³ Waste allowance 0.145 m³ Supplier rounding surplus 0 m³ Dimensions come from your plan. Confirm order increments and the specification with your supplier.
85 mm	1.87 m³	-0.33 m³	Open in calculator Exact quantity breakdown Net pour area 20 m² Calculated volume 1.7 m³ Waste allowance 0.17 m³ Supplier rounding surplus 0 m³ Dimensions come from your plan. Confirm order increments and the specification with your supplier.
97.5 mm	2.145 m³	-0.055 m³	Open in calculator Exact quantity breakdown Net pour area 20 m² Calculated volume 1.95 m³ Waste allowance 0.195 m³ Supplier rounding surplus 0 m³ Dimensions come from your plan. Confirm order increments and the specification with your supplier.
110 mm	2.42 m³	0.22 m³	Open in calculator Exact quantity breakdown Net pour area 20 m² Calculated volume 2.2 m³ Waste allowance 0.22 m³ Supplier rounding surplus 0 m³ Dimensions come from your plan. Confirm order increments and the specification with your supplier.
122.5 mm	2.695 m³	0.495 m³	Open in calculator Exact quantity breakdown Net pour area 20 m² Calculated volume 2.45 m³ Waste allowance 0.245 m³ Supplier rounding surplus 0 m³ Dimensions come from your plan. Confirm order increments and the specification with your supplier.
135 mm	2.97 m³	0.77 m³	Open in calculator Exact quantity breakdown Net pour area 20 m² Calculated volume 2.7 m³ Waste allowance 0.27 m³ Supplier rounding surplus 0 m³ Dimensions come from your plan. Confirm order increments and the specification with your supplier.
147.5 mm	3.245 m³	1.045 m³	Open in calculator Exact quantity breakdown Net pour area 20 m² Calculated volume 2.95 m³ Waste allowance 0.295 m³ Supplier rounding surplus 0 m³ Dimensions come from your plan. Confirm order increments and the specification with your supplier.
160 mm	3.52 m³	1.32 m³	Open in calculator Exact quantity breakdown Net pour area 20 m² Calculated volume 3.2 m³ Waste allowance 0.32 m³ Supplier rounding surplus 0 m³ Dimensions come from your plan. Confirm order increments and the specification with your supplier.

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

Concrete 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.