Concrete slab
Useful when planning a pad, path panel or other slab of uniform thickness. Measure the footprint once, then enter how many identical slabs you need.
Concrete calculators for iPhone
Estimate a slab, footing, wall, column, steps or post holes. Keep net concrete, your allowance and the delivery plan separate.
In the app · English
Tools → Concrete volume
For iPhone · iOS 18 or later
Free to download.
Choose by the shape and the job
Post holes
For repeated fence or support holes of the same size. Concrete occupies the hole volume left after subtracting the embedded post.
Strip footing
For a continuous footing or trench with the same width and depth throughout the measured run.
Concrete wall
For cast concrete walls where rectangular full-depth openings remove material from an otherwise solid wall.
Concrete columns
For columns or solid piers of constant cross-section. Measure one column, then multiply by the number of identical pieces.
Concrete steps
For a solid stepped block. This volume model fills all space below each tread; it does not model a thin reinforced stair slab.
One material, six different measurements
A slab starts with a plan area and thickness. A strip footing uses the total run and a constant section. Walls deduct rectangular openings; post holes deduct the portion occupied by a post. Columns multiply a section by height and quantity. Steps add solid blocks above a flat base.
From volume to delivery
Planning ready-mixed concrete uses the required volume and a delivery capacity you enter. Bagged concrete uses the mixed yield per bag; bag mass alone does not determine it. Whole bags and loads round up. Optional costs use the price you enter per unit of volume or per bag.
Bag-count example for a separate slab: 0.660 m³ divided by an assumed yield of 0.020 m³ per bag gives 33 bags. This yield is an example input, not a specification for every 40 kg or 50 kg bag. Check the selected product.
Measure the concrete boundary
Use the inside dimensions of the formwork or the actual excavation. Avoid counting intersections twice. The app estimates the volume you describe; it cannot infer irregular ground, hidden voids or a structural specification.
Calculate your concrete volume.
Choose the concrete shape and enter your own dimensions in Pro² for iPhone.
For iPhone · iOS 18 or later
View Pro² on the App Store
Scan with your iPhone camera.Free to download.