Estimate the form-contact area and whole reusable panels required for concrete walls, columns, beams, slab edges, and footings. Select only the faces that actually need temporary forms.
Form-contact area is the concrete surface touching temporary form faces. It is not every surface of the finished concrete element.
This calculator converts selected faces to square meters internally, applies waste once, and then estimates whole panels with reuse and pour-sequencing limits.
area = length × height × formed sides + thickness × height × formed endsarea = (selected width faces + selected depth faces) × heightarea = length × selected side depths + length × bottom width + selected end areasarea = formed perimeter length × slab thicknessarea = selected side lengths × footing depthplanning area = base form-contact area × (1 + waste rate)panels = ceil(max(planning area ÷ (panel area × reuse cycles), simultaneous area ÷ panel area))A 20 × 8 ft wall formed on two sides has 320 ft² of form-contact area. With 10% waste and 4 × 8 ft panels used once, buy 11 panels.
A 2 × 2 ft, 10 ft tall four-sided column has 80 ft² of form-contact area.
A 20 × 1 × 2 ft beam with two sides and its bottom formed has 100 ft² of form-contact area.
A 20 × 30 ft slab with a 6 in edge has 50 ft² of edge formwork.
For 1,100 ft² of planning usage, 4 × 8 ft panels and two reuse cycles require 18 panels by reuse. A 700 ft² simultaneous requirement raises the purchase to 22 panels.
Do not include tops, bottoms, ends, or excavation-contact faces unless temporary forms are planned there.
Reuse depends on pour sequence, stripping time, panel condition, and whether sections overlap in the schedule.
Enter the largest area that must remain formed at one time so reuse does not understate the physical panel count.
A qualified formwork designer must determine pressure, panel thickness, framing, ties, bracing, shoring, and safe placement procedures.
Walls can use one or two main faces; end forms are separate. Rectangular columns use explicit counts for width and depth faces and exclude top and bottom.
Beam sides, soffit, and ends are individually selected. Slab-edge mode includes only the vertical edge. Footings include only selected vertical sides because many are poured directly against excavation.
Panel area comes from editable panel dimensions. Waste increases total form-contact usage once before panel requirements are calculated.
Reuse cycles represent sequential placements, not panels physically present at one time. The simultaneous-area minimum overrides reuse math when it requires more panels.
Price per panel uses the final whole-panel purchase quantity. Optional other cost is manual; studs, walers, ties, fasteners, release agent, shoring, and labor are not estimated automatically.
This material estimator does not calculate concrete pressure, plywood adequacy, stud or waler spacing, ties, clamps, bracing, shoring capacity, placement rate, safety procedures, or code compliance.
Add the areas of only the concrete faces that will touch temporary forms.
Multiply length by height and by one or two formed faces, then add only selected end forms.
Only when both faces require forms. A wall against existing work or earth may use one formed face.
Multiply the combined lengths of selected vertical faces by column height and quantity.
Add selected side areas, soffit area, and any explicit end forms. The top is not included.
Multiply the formed edge length by slab thickness.
Multiply selected vertical side lengths by footing depth. Do not count excavation-contact sides unless formed.
Divide waste-adjusted form-contact usage by 32 ft² and reuse cycles, enforce any simultaneous-area minimum, then round upward.
Often, but actual reuse depends on material, handling, finish requirements, sequencing, and panel condition.
Each planned reuse increases theoretical project coverage per purchased panel, provided pours can be sequenced.
It is the greatest form-contact area that must be assembled at the same time and sets a physical panel minimum.
Project complexity, cuts, damage, and reuse affect waste. Choose an allowance appropriate to the plan.
No. It estimates material area and panels only.
No. Ties and bracing are safety-critical design decisions.
No. Any thickness entry is informational and is not checked for adequacy.