Enter the measured geometry
Use length, width, and thickness for a rectangle, or diameters and depth for a round shape.
Concrete volume without hidden assumptions
Turn measured dimensions into a concrete estimate you can check.
Choose a rectangular slab or a round hole, enter the dimensions and quantity, then decide whether to add an explicit percentage. If you copy one-bag yield from the selected mix label, ConcreteCalc also shows whole-bag rounding and optional cost. It does not choose dimensions, strength, reinforcement, mix, or allowance for you.
Free · No signup · No saved project · Runs in your browser
Three explicit steps
Measure, choose any extra, then read the label
State the extra yourself
Leave the field at zero or enter a percentage chosen for this project; none is inserted automatically.
Copy volume yield, not bag mass
Bag count appears only after you enter the volume yielded by one bag from its exact label or datasheet.
Two bounded geometries
Use the same transparent sequence for each pour
- Estimate a rectangular slab, pad, wall, or footing from entered dimensions and quantity.
- Estimate round holes or tubes and subtract only a round inner diameter you measured.
- Convert adjusted volume to whole bags only with yield from the exact package selected for purchase.
Bring your measurements and label
Build a concrete estimate you can explain
Enter your geometry, any deliberate extra, and the selected product’s stated yield. Volume and packaging remain separate.