Concrete Beam Volume Calculator

Work out concrete beam volume instantly with clear inputs, formula shown and shareable results.

About Concrete Beam Volume Calculator

Beam concrete is the section area times the span, repeated for each beam. Formwork covers the soffit and both sides, so the developed width is the beam width plus twice its depth. Reinforced concrete weighs about 2.4 tonnes per cubic metre, which sets the load the falsework must carry.

Formulas

Beam volume

V = width x depth x length x count

Formwork

Area = (width + 2 x depth) x length x count

Worked example

With the default values below, Concrete Beam Volume Calculator returns Total concrete volume of 2.070. Change any input above and every figure here is recalculated in your browser.

Inputs used

Beam widthminimum 0.05 m: 0.23 m
Beam depthminimum 0.05 m: 0.45 m
Beam lengthminimum 0.1 m: 5 m
Number of beamsminimum 1: 4

Results

Total concrete volume: 2.070 m³
Volume per beam: 0.5175 m³
Formwork area: 22.60 m²
Concrete weight: 4.97 t

Step by step

1Values used
2Beam volume
3Formwork
4Total concrete volume= 2.070 m³
5Volume per beam= 0.5175 m³
6Formwork area= 22.60 m²
7Concrete weight= 4.97 t

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Concrete Beam Volume figure worked out?

V = width x depth x length x count. Beam concrete is the section area times the span, repeated for each beam.

Is the slab thickness included in beam depth?

Beam depth is usually quoted overall. If the slab is cast monolithically, deduct the slab thickness from the beam depth for the concrete take-off so the volume is not counted twice.

What values do I need to enter?

This calculator takes 4 inputs: Beam width, Beam depth, Beam length, Number of beams. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.