Formwork Load & Material Calculator

Inputs

Results update as you type.

Geometry

Wall height (pour)Top of pour to base.

Wall length

Wall thickness

Concrete placement

Placement rateVertical rise of concrete in the form per hour.

m/h

Concrete temperatureAt placement. Colder concrete sets slower and pushes harder.

°C

Cement / admixture

Concrete density

kg/m³

Placement methodSelf-consolidating concrete, slump over 175 mm (7 in), pumping from the base or revibration deeper than 1.2 m (4 ft) all require full liquid head.

Formwork build-up

Facing sheet size

Stud spacingVertical members, centre to centre.

Waler spacingHorizontal rows, centre to centre.

Tie spacing (horizontal)

Tie spacing (vertical)

WastageOffcuts and damaged sheets.

Diagram updates as you type.

Results

Check the working before you order.

Facing sheets required

27sheets, 10% waste incl.

Contact area (both faces)	72.0 m²
Stop-ends (both wall ends)	1.5 m²
Concrete volume	9.00 m³
Studs (each 3.0 m)	62 pcs · 186.0 m
Waler length, total	120.0 m (5 rows per face)
Form ties required	100 pcs
Load per tie at peak pressure	13.8 kN

Peak lateral pressure on formwork

38.4 kPa

54% of full hydrostatic pressure at this height: ACI 347 wall equation (R < 7 ft/h ≈ 2.1 m/h, h ≤ 14 ft ≈ 4.2 m).

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Working

Cw = 1.000 (from density); Cc = 1.0; R = 4.92 ft/h; T = 68 °F
ACI 347: p = Cw·Cc·(150 + 9000R/T) = 38.4 kPa
Limits: minimum 600·Cw psf; maximum w·h = 70.6 kPa
Design pressure = 38.4 kPa, reached 1.63 m below the top of the pour
Contact area = 2 × H × L = 2 × 3.0 × 12.0 = 72.0 m²
Sheets = ⌈72.0 × 1.10 ÷ 2.98 m²⌉ = 27
Studs = (⌈L ÷ 400⌉ + 1) × 2 faces = 62
Walers = ⌈H ÷ 600⌉ = 5 rows × 12.0 m × 2 faces = 120.0 m
Ties = ⌈L ÷ 600⌉ × ⌈H ÷ 600⌉ = 100; load = 38.4 kPa × 600 × 600 mm = 13.8 kN

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.

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