Calculators
Concrete Calculator — Bags and Cubic Yards
Bagged concrete and ready-mix use the same volume math with different packaging. This layout is a 10 by 10 ft slab at 4 inches thick with 10% waste.
Above about one cubic yard, the assumptions note that ready-mix delivery is often more practical than stacking bags — without quoting a price.
Use controls below for shape, dimensions, and bag yield.
| Item | Area | Size | Buy |
|---|---|---|---|
| Concrete | — | 36.7 cu ft | 62 bags |
| Ready-mix equivalent | — | 1.4 cu yd | 1.5 cubic yards |
Assumptions
- Rectangle slab: 10 × 10 ft × 4 in
- Waste factor: 10%
- Volume: 33.33 cu ft
- Volume with waste: 36.67 cu ft (1.36 cu yd)
- Bag yield: 0.6 cu ft per bag (check bag label)
- Above about 1 cubic yard, ready-mix delivery is often more practical than bags — compare options locally.
Supplies checklist
- Gravel or crushed stone base
- Wire mesh or rebar (slabs)
- Form boards and stakes
- Concrete mixer or mixing tub
- Float and edger
Estimates only. Check the coverage figure on your product before buying.
The Handy Pages · thehandypages.com
More concrete presets
Handy gear for mixing and finishing concrete
- Mixing tub or wheelbarrow liner for small batches (opens in new tab)
- Concrete float and finishing trowel for smooth surfaces (opens in new tab)
- Rubber or waterproof work boots for wet mix and cleanup (opens in new tab)
- Heavy rubber gloves when hand-mixing or handling wet concrete (opens in new tab)
Find these on Amazon (opens in new tab)
As an Amazon Associate I earn from qualifying purchases. Full affiliate disclosure