The toolbox / Concrete
Concrete calculators & tools
Estimate concrete for slabs, footings, poured walls, and post holes from known dimensions. Keep net volume, deductions, allowance, bags, and material cost clearly separated.
Choose your concrete calculator
Start with the element you are measuring. Each tool keeps net concrete volume separate from the allowance you choose.
Slabs and rectangular pads
Concrete Slab Calculator
Concrete volume, a separate allowance and optional material cost. Choose the footing tool for a strip, pad or circular footing.
- Have ready
- Length, width, uniform thickness and number of identical slabs.
Strip, pad and circular footings
Concrete Footing Calculator
Net and per-footing volume, with optional bags from your product yield. Use the fence-post tool when an embedded post displaces concrete.
- Have ready
- Footing shape, length and width or diameter, depth and count.
Poured walls with openings
Poured Concrete Wall Calculator
Wall volume after opening deductions, a separate ordering allowance and optional bags or material cost.
- Have ready
- Wall length, height, concrete thickness and rectangular openings for each group.
Concrete around fence posts
Concrete Fence Post Calculator
Concrete volume after post displacement. Enter your product yield to compare pooled-project and per-hole whole-bag plans.
- Have ready
- Hole diameter, concrete-filled depth, post dimensions and number of holes.
Before you order
Use project dimensions and the exact product data
These calculators estimate quantities from dimensions you provide. Foundation sizing, reinforcement and concrete specifications must come from the project. Where a tool offers bag estimates, enter the yield for the exact product. Optional cost results cover the entered material rate, rather than a complete installed quote.
Concrete guides
Materials, wall systems and quantity planningConcrete supply guide
Ready-Mix vs Bagged Concrete
Prepare comparable supplier quotes using the same project requirements and quantity. Check delivery, access, mixing work and extra charges.
Fence-post product guide
Quick-Set Concrete for Fence Posts
Check the exact product instructions, separate setting and loading times, and carry the listed yield into your bag estimate.
Wall comparison guide
Poured Concrete vs Block Walls
Compare wall systems, understand their different material quantities, and check what belongs in a complete quotation.
Bag yield guide
How Many Cubic Feet Are in an 80 lb Bag of Concrete?
Check the listed yield for the exact product, then convert a project volume into whole bags without treating bag weight as a universal volume.
Foundation quantity guide
How to Calculate Concrete for a Footing and Stem Wall
Calculate the footing and stem wall separately, avoid overlap, and combine both net volumes without hiding the component quantities.