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Concrete Volume Calculator

Calculate concrete volume for slabs, beams, walls, columns (rectangular or round), and footings, combine several pieces into one project, and see how many bags to buy, in metric or imperial.

Tool statusRuns in your browser
Preview
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Geometric volume and purchase volume are different things.

The tool calculates from your dimensions first, then applies the margin you choose. Uneven excavation, formwork, and workmanship can change the real volume.

prontouso://site/concreteGEOMETRY · VOLUME · PURCHASE

Element to pour

The fields change to match the geometry.

INPUT
Dimension units
m
m
cm
SKETCH · NOT TO SCALE
Purchase margin
Waste / planned surplus7%

The margin is applied to the net volume, not to the dimensions.

LOCAL CALCULATION · NO ACCOUNT NEEDED

Volume for this piece

Geometry first, purchasing second.

SLAB / FLOOR
VOLUME TO BUY+7% MARGIN
PREPARE ROUGHLY
2.14 m³

The geometry gives 2.00 m³ net. With a 7% margin, the volume to buy rises to 2.14 m³.

2.00 m³ net
before the margin
1 PIECE
2,140 LVOLUME TO BUY, IN LITERS
2.80 yd³CUBIC YARDS
0.14 m³ADDED BY THE MARGIN
Where did the number come from?VOLUME
ONE PIECE2.000 m³5.00 m × 4.00 m × 10.0 cm
×
QUANTITY1piece(s)
→
NET VOLUME2.00 m³before the margin
Project / whole pourMULTIPLE ELEMENTS

Add this piece to combine slabs, beams, columns, and footings in the same order.

Bagged concreteOPTIONAL

Yield varies by product. Enter how many liters of ready mix one bag produces — the tool won't guess that value for you.

L
ESTIMATED QUANTITYEnter the yield
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How it works

  1. Enter your input

    Fill in the values, paste your text, or upload the file this tool works with.

  2. See results instantly

    Most tools update live as you type; a few use a single button. Either way, the result appears right on this page.

  3. Use your results

    Copy, download, or share what the tool produces — you're always in control of the output.

Privacy and processing — Runs locally in your browser. This tool does not upload your input.

What is Concrete Volume Calculator?

A concrete volume calculator turns an element's dimensions — slab, beam, column, footing — into cubic meters, liters, and the number of bags needed, with an allowance for waste and the ability to combine several pieces into one order.

UNDERSTAND THE TOOL

How to calculate concrete volume for any element

Use this calculator to estimate the concrete volume of slabs, beams, walls, columns (rectangular or round), and footings, add several pieces to the same project, and see how many pre-mixed bags to buy — in cubic meters, liters, or cubic yards.

How volume is calculated for each shape

The tool uses a different formula per element type. Depth on slabs, walls, and footings is entered in centimeters (or inches in imperial mode), while length, width, and height are in meters (or feet) — a small 10 or 15 cm depth is awkward to type in meters, but length and height are usually already in that unit. Switching between metric and imperial automatically converts the values you've already typed, without losing the piece you were calculating.

Slab / wall / footing
length * width * depth
Beam
length * width * height
Rectangular column
width * depth * height
Round column
π * (diameter / 2)² * height
Volume to buy
single-piece volume * quantity * (1 + waste% / 100)

A 5 m × 4 m slab, 10 cm deep, 1 piece, 1% waste

The net volume is 2.00 m³; with 1% waste, the volume to buy rises to 2.02 m³ (2,020 liters).

5*4 = 20 m²; 20 * 0.10 = 2 m³; 2 * 1.01 = 2.02 m³

A 1.2 m × 1.2 m × 40 cm footing, 4 units, 10% waste

Each footing is 0.576 m³; 4 units add up to 2.304 m³ net, which becomes 2.5344 m³ with waste.

1.2*1.2*0.4 = 0.576 m³; 0.576*4 = 2.304 m³; 2.304*1.10 = 2.5344 m³

Quantity, project totals, and bagged concrete

The quantity field multiplies a single piece's volume before waste is applied, for cases like 4 identical footings or 6 matching columns. Once you've calculated a piece, you can add it to a project to combine different slabs, beams, columns, and footings into one purchase total — each piece is added to the project using the values it had at the moment you added it, so changing the fields afterward doesn't change what's already in the list. The bagged-concrete block is optional: skip it if you're not buying bags (ready-mix delivery, for example); if you are, enter the liter yield printed on the product and choose whether the calculation applies to the current piece or the whole project.

Before you pour

  • Compact and level the subgrade — an uneven base is a much more common source of problems than a slightly off volume estimate.
  • Check the weather: extreme heat, cold, or rain around the pour affects both working time and cure quality.
  • Confirm the bag's actual liter yield on its label — it's usually printed per bag, and brands do differ.

When to bring in a professional

  • Anything load-bearing, like a foundation, retaining wall, or structural column.
  • Large pours where a small volume miscalculation gets expensive fast.
  • Local codes that may require permits or inspection for the specific project.

This is a materials estimate, not an engineering sign-off

Bag yield varies by brand and by how the bag is mixed, and this tool has no way to check load-bearing requirements — confirm both with the product label and, for anything structural, a qualified professional.

Frequently Asked Questions

Why enter depth in centimeters but length and height in meters?

Small slab or wall depths (10–20 cm) are easier to measure and type in centimeters (or inches in imperial mode), while length, width, and height are usually already in meters (or feet).

Does switching from metric to imperial reset everything?

No — the values you've already typed for each of the six shapes are converted to the new unit automatically, so you don't lose what you filled in when you toggle.

What does adding a piece to the project do?

It adds the current piece's volume (already multiplied by quantity and waste) to a running list, so you can combine different slabs, beams, columns, and footings into the purchase total for an entire pour.

Do I have to fill in the bag yield?

No — the bag calculation is optional. Without a liter yield for the product you're using, the tool still shows the volume in cubic meters, liters, and cubic yards.

Does this replace engineering advice?

No — it's a volume and materials estimate, not a structural design tool.

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