Beam Formwork Calculator

Inputs

Results update as you type.

Beam
m
mm
mm
mm
Supports
mm
mm
kg/m³
Sheets
%
Beam formwork section and elevationSection600 mm300 mmElevation6 mprops @ 1200 mmmyconstructioncalculator.comNot to scale
Diagram updates as you type.

Results

Check the working before you order.

Formwork area (soffit + sides)
7.20m²
Soffit1.80 m²
Sides below the slab5.40 m²
Sheets3 sheets, 10% waste incl.
Props6 pcs
Load per prop (approx.)6.7 kN
Side clamps / kickers11 sets
Concrete in beam below slab0.81 m³

Compare the prop load with the prop’s safe working load at its extended height, from the supplier’s table.

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Working
  1. Depth below slab d = 0.600 − 0.150 = 0.450 m
  2. Soffit = b × span × n = 0.300 × 6.00 × 1 = 1.80 m²
  3. Sides = 2 × d × span × n = 2 × 0.450 × 6.00 × 1 = 5.40 m²
  4. Props = (⌈span ÷ 1,200⌉ + 1) × 1 = 6; clamps = (⌈span ÷ 600⌉ + 1) × 1 = 11
  5. Line load = (concrete 0.600 m deep + 0.5 kPa forms + 2.4 kPa live) × b + side forms = 5.56 kN/m
  6. Load per prop = 5.56 kN/m × prop spacing = 6.7 kN (single row of props under the beam)

Results are estimates for planning and material ordering only. They are not a substitute for structural design or approval by a qualified engineer. Read the full disclaimer.

Beam Formwork Calculator byMy Construction Calculator: free construction calculators with the working shown.