Concrete
Concrete Slab Calculator
Estimate concrete volume, purchase quantity, waste, and cost for a rectangular slab.
Project category
Concrete calculators
Concrete volume, bag, footing, post-hole, and slab planning calculators.
Verified tools
Plan concrete quantities transparently
Concrete
Post-Hole Concrete Calculator
Estimate concrete volume, post displacement, whole bags, leftovers, and cost for round post holes.
What concrete estimates need to show
Concrete planning begins with measured geometric volume, but purchasing may also require a visible allowance for field variation, supplier increments, or whole bags. Calculate My Project keeps those stages separate so users can see which quantity is exact geometry and which is a purchasing decision.
Every published concrete calculator documents its supported shape, unit conversions, waste behavior, material-yield source, rounding boundary, price basis, and limitations. These tools estimate quantities; they do not replace structural design, local code review, or supplier confirmation.
Read the full calculation methodologyPlan before calculating
Concrete project guides
Project planning guide
How to Measure and Plan a Concrete Project
Build a defensible concrete quantity plan from measured geometry, product yield, an explicit allowance, and supplier confirmation.