Outils pratiques pour un travail de précision
Calculateur de Volume de Béton
Calculez le volume de béton pour une dalle, une semelle, un poteau ou un cylindre, avec un schéma annoté.
How it works
How to use it: pick a shape, then fill in the three dimension fields - their meaning changes with the shape you choose. For a slab or footing, "length" and "width" are the two plan dimensions and "depth" is thickness. For a rectangular column, the same three fields become width, depth and height. For a cylinder, "length" becomes diameter and "depth" becomes height (the width field is unused).
Formula. Slab and column volume is the product of the three dimensions; a cylinder's volume uses its radius (half the diameter):
Slab / column volume = length × width × depthCylinder volume = π × (diameter ÷ 2)² × height
All three dimensions are entered in millimetres; the result is converted to cubic metres (÷ 1e9), US cubic yards (× 1.30795 per m³), and litres (÷ 1e6).
Worked example. With the defaults above (slab, 5000 mm × 3000 mm × 100 mm thick): volume = 5000 × 3000 × 100 = 1,500,000,000 mm³ = 1.500 m³, which is 1.500 × 1.30795 ≈ 1.962 yd³, or 1500 L.
Current-input example
The result above uses these exact values. This snapshot is included when the page is printed so the output can be checked against the original measurements.
- Shape
- Slab / footing
- Length / diameter
- 5000 mm
- Width / depth
- 3000 mm
- Thickness / height
- 100 mm
Primary result: Volume: 1.500 m3.
Before using the result
- Measure from the datum or reference edge described by this tool, and do not mix inside, outside and centerline dimensions.
- Keep inputs in the displayed units and preserve more precision than the final cutting or purchasing tolerance requires.
- When the result is close to a limit, verify it with a test piece, field measurement, manufacturer drawing or qualified project professional.
Limitations
This is a pure geometric volume - it does not add an ordering allowance for spillage, formwork deflection, uneven sub-grade or over-excavation, or for rounding up to a ready-mix supplier's minimum load or delivery increment. A commonly used margin is 5-10% on top of the calculated volume; confirm the right allowance with your supplier.
It also doesn't account for rebar/mesh displacement, sloped or stepped footings, or column volume lost to embedded items - for anything other than a simple slab, rectangular column, or plain cylinder, break the pour into these basic shapes and sum the results.
Frequently asked questions
Should I round up before ordering ready-mix concrete?
Yes. This tool gives the theoretical geometric volume only. Ready-mix suppliers typically sell in fixed increments and most contractors add 5-10% over the calculated volume to cover spillage and sub-grade variation - ask your supplier what minimum load and increment they work in.
Which fields do I fill in for a cylinder?
Use "Length / diameter" for the diameter and "Thickness / height" for the height; the "Width / depth" field is ignored for this shape.
How do I calculate an L-shaped or irregular slab?
Split it into rectangular sections, calculate each one separately using the slab option, and add the resulting volumes together.
Outils associés
Calculateur de Gravier
Calculez la quantité de gravier, de paillis ou de terre nécessaire pour une surface et une épaisseur données.
Calculateur Espacement Balustres
Entrez l'ouverture de garde-corps, la largeur des balustres et l'écart maximal souhaité pour calculer un tracé à espacement égal.
Espacement Lattes de Clôture
Tracez l'espacement des lattes de clôture sur une longueur, avec un schéma en direct de la section de clôture terminée.
Calculateur d'Escalier
Déterminez le nombre de contremarches et de marches, la hauteur de contremarche et l'angle de l'escalier à partir de la hauteur et de l'emprise totales.