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Rectangular Column Formwork Calculator

Estimate contact formwork area for the four vertical faces of rectangular columns.

Editable waste and coverage assumptionsCheck supplier specifications
Project planner
Project planner

Review dimensions, coverage and waste before ordering.

See the method

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Runs on your device

Your material estimate

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter column side a, column side b, column height, number of columns.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Four-side formwork contact area = 2(a+b) × height × column count.

A WORKED EXAMPLE

Using column side a = 0.4 m, column side b = 0.3 m, column height = 3 m, number of columns = 4, the result is 16.8 m². Change these example inputs to match your task; use the method above to check each step.

Understanding your result

Excludes top, base, bracing and material reuse. Contact area is not a structural formwork design.

What to keep in mind

Excludes top, base, bracing and material reuse. Contact area is not a structural formwork design. A material-quantity estimate, not a structural design or building-code check. Confirm site measurements, supplier coverage and waste before ordering.

Common questions

How do I use this rectangular column formwork calculator?

Estimate contact formwork area for the four vertical faces of rectangular columns. Enter column side a in m, column side b in m, column height in m, number of columns. The starting example is editable; use values for the same system or project.

Which assumptions affect this result?

Excludes top, base, bracing and material reuse. Contact area is not a structural formwork design.

Methodology maintained by ClarityKit. How these tools are built and checked.