All calculators & charts
13 tools covering concrete volume and cost, aggregate deliveries, reinforcement and masonry units — plus the reference charts behind them.
Quick answer
Start with the concrete calculator for any pour, the cubic yard calculator for a plain volume conversion, or the gravel calculator for a base or driveway delivery in tons.
Concrete Calculators
- Concrete CalculatorCubic yards, bags and weight for slabs, footings, columns, steps and curbs.
- Concrete Slab Cost CalculatorReady-mix versus bagged cost for a slab, including delivery and short-load fees.
- Concrete Bag CalculatorHow many 40, 50, 60 or 80 lb bags a pour needs, by published bag yield.
- Post Hole Concrete CalculatorConcrete per hole and per fence run, with the post volume subtracted.
- Rebar CalculatorBar count, total length, lap splices and weight for a slab or footing grid.
Aggregate & Volume Calculators
Masonry Calculators
Reference Charts
Slab size pages
Pre-solved pages for the slab sizes people search for most.
- 4 x 4 ft slabAir-conditioner or generator pad
- 6 x 6 ft slabHot tub pad or small landing
- 8 x 8 ft slabShed base or grill pad
- 10 x 10 ft slabPatio or small shed floor
- 10 x 12 ft slabPatio
- 10 x 20 ft slabSingle-car parking pad
- 12 x 12 ft slabPatio or one-car garage bay
- 12 x 16 ft slabLarge patio
- 12 x 20 ft slabSingle-car driveway section
- 12 x 24 ft slabDriveway run
- 16 x 16 ft slabLarge patio or workshop floor
- 16 x 20 ft slabTwo-car parking pad
- 20 x 20 ft slabTwo-car garage floor
- 20 x 24 ft slabTwo-car garage floor
- 24 x 24 ft slabTwo-car garage or shop floor
- 24 x 30 ft slabThree-car garage or shop floor
- 30 x 30 ft slabLarge shop or barn floor
- 30 x 40 ft slabPole barn floor
- 40 x 60 ft slabCommercial pad