Volume
Concrete Volume Calculator
Yards, cubic feet, and cubic meters stay on screen together. Pick the shape, or start from a volume you already have and convert it.
Your region
Feet, inches, cubic yards, and 40–80 lb bags
Concrete Calculator
Example measurements — replace them with yours.
Common sizes
Most orders add 5–10% for spillage, uneven ground, and the last bit left in the chute.
Cost, truck size, and concrete weight
Leave a price blank to skip that estimate. Use the number your supplier quoted.
This job
Add each pour — slab, piers, steps — and Concrete Calculator totals them.
Quick answer
Concrete Volume Calculator: rectangles multiply three sides. Cylinders use πr²h. Solid stairs use W×T×R×n(n+1)/2. Concrete Calculator shows yd³, ft³, and m³ together because bags, trucks, and metric tickets all hang off that one volume.
How to use a concrete volume calculator
Split odd shapes. A slab with a trench footing is two volumes. A set of piers is one pier times a count. Add them in the job list, then apply waste once. The concrete formula guide lists every shape Concrete Calculator ships.
People searching “how to calculate concrete” usually need the inch-to-foot step more than a new formula. Four inches is 0.333 feet. Leave the unit on the field and let Concrete Calculator convert.
Concrete Volume Calculator: the formula
- Slab / footing / wall: L × W × T
- Round column / sonotube: πr²h
- Ring: π(R² − r²) × T
- Solid stairs: W × T × R × n(n+1)/2
- Curb & gutter: length × section area
- Monolithic: slab + edge below slab (corners once)
From volume to an order
Once you have neat cubic feet, ÷ 27 for yards, apply waste, round trucks to 0.25 yd, or ÷ bag yield for bags. Weight is volume × density. Cost is volume × your rate. Every other Concrete Calculator calculator is this pipeline with a friendlier shape preset.
How to calculate concrete quantity on mixed jobs
List every shape. Convert every dimension. Apply the matching formula. Sum cubic feet. Divide by 27. That is how to figure concrete when the pour is not one rectangle. Concrete Calculator’s job list is the same checklist without the spreadsheet.
People searching “concrete calculator formula” want the geometry and the ÷27 step. People searching “how to measure concrete” often need to know what to measure: form inside faces, pour depth (not dig depth when stone fills the bottom), and inside tube diameter.
Units that keep takeoffs honest
Show yd³, ft³, and m³ together when tickets cross borders. Bags and trucks hang off the same volume. If metric inputs are easier, open the metric calculator; the formulas do not change.
From measurement to material
How to calculate concrete quantity is a pipeline: measure, convert, multiply, sum, waste, round, then choose bags or truck. Skipping the sum step is how multi-pier jobs get over-ordered. Skipping waste is how they get under-ordered.
Concrete material calculator searches sometimes want cement, sand, and stone from a ratio. That is the mix ratio page after this page (or any shape page) gives wet volume.
Related tools
Shape pages apply these formulas with presets. Guides explain the inch conversion.
Frequently asked questions
How do you calculate concrete volume?
Convert to feet, multiply the shape formula, divide by 27 for yards.
How many ft³ in a yard?
27.
Can I start from known yards?
Yes — use “I know the volume” on ordering pages.
Where is the formula shown?
Under the result on each calculator, and in the concrete formula guide.