Calculator collection
Footings, columns & steps calculators
Concrete for footings, Sonotubes, post holes, steps and walls.
Concrete Column CalculatorFree concrete column calculator for square and rectangular columns and beams. Get cubic yards, m³, weight and 40–90 lb bag counts per column.Open calculator 
Concrete Footing CalculatorFree concrete footing calculator. Enter total length, width and depth to get cubic yards, m³ and bag counts for wall footings, footers and pier pads.Open calculator 
Concrete Steps CalculatorFree concrete steps calculator. Enter number of steps, rise, run, width and landing to get cubic yards, m³, 40–90 lb bag counts and weight for poured stairs.Open calculator 
Concrete Wall CalculatorFree concrete wall calculator. Enter wall length, height and thickness to get cubic yards, m³ and 40–90 lb bag counts for poured and retaining walls.Open calculator 
Fence Post Concrete CalculatorHow many bags of concrete per fence post? Enter hole diameter, depth, post size and post count to get 40 to 90 lb bag counts.Open calculator 
Sonotube Concrete CalculatorFree Sonotube calculator. Enter tube diameter, depth and number of tubes to get cubic yards, m³ and 40–90 lb bag counts for round piers and columns.Open calculator FAQ
Frequently asked questions
How do I calculate concrete for a round column or Sonotube?
Volume = π × radius² × height. A 12 in tube (0.5 ft radius) 4 ft tall holds 3.1416 × 0.25 × 4 = 3.14 ft³, about 0.12 yd³ or six 80 lb bags at 0.60 ft³ per bag (QUIKRETE 1101 data sheet).
How deep and wide should a fence post hole be?
QUIKRETE's post-setting guide says to make the hole 3 times the post diameter, set 1/3 of the post's overall length in the ground plus a 6 in gravel base, and put structural posts at least 6 in below the frost line.
How do I size footings?
These calculators work out the concrete volume for the footing size you enter. They do not design footings: width and depth depend on soil, loads and your local building code, so take dimensions from your plans or an engineer.
How much does a yard of concrete weigh?
Normal-weight concrete is about 150 lb/ft³ (WSDOT design memo), so one cubic yard weighs about 150 × 27 = 4,050 lb, a little over 2 short tons.
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