Concrete Calculators and Guides
Plan slabs, footings and fence posts: work out the volume in cubic yards and how many 40, 60 or 80 lb bags to buy. The guides cover how thick a slab should be, how much each bag size yields, and when ready-mix delivery beats mixing bags by hand.
Calculators for concrete projects
CalculatorConcrete Calculator
Work out how much concrete you need for a slab in cubic yards, cubic feet or cubic meters, and how many 40,…
CalculatorFence Post Concrete Calculator
Find how many bags of concrete you need to set fence posts, deck posts or mailbox posts, based on hole size, depth,…
CalculatorConcrete Bag Calculator
Turn a volume of concrete into the number of 80 lb, 60 lb and 40 lb pre-mixed bags you need, with a…
CalculatorConcrete Footing Calculator
Work out the concrete for round deck and porch piers in form tubes, with an optional square footing pad, in cubic feet,…
Concrete guides
GuideHow Thick Should a Concrete Slab Be?
Most patios, walkways and shed floors are poured 4 inches thick; driveways for heavier vehicles 5 to 6 inches. Typical thicknesses by…
GuideBagged Concrete vs Ready-Mix: Which Is Cheaper?
Bagged concrete usually wins below about half a cubic yard and ready-mix above one cubic yard. How to compare your own prices,…
GuideConcrete Bag Yield Chart: 40, 60 and 80 lb Bags
How much concrete one bag makes: about 0.30 cu ft for a 40 lb bag, 0.45 cu ft for 60 lb and…
GuideHow Much Concrete Do I Need? Slab Formula, Table and Examples
Multiply length × width × thickness in feet and divide by 27 to get cubic yards. Worked examples, a quick table for…