Concrete Calculator 🧱
Quickly estimate how much concrete you need for slabs, footings, columns, and stairs, including cubic yard/meter totals and pre-mix bag counts.
About Concrete Calculator 🧱
Plan Your Pour with Confidence
Enter the dimensions of your slab, footing, column, or stair pour to see instant volume totals and bag estimates. The Concrete Calculator keeps homeowners, DIYers, and contractors aligned on quantities, waste allowances, and delivery options before the truck arrives.
Multi-shape Coverage
Handle flatwork slabs, strip footings, round columns, and monolithic stairs without switching tools.
Bag Breakdown
Compare 40/60/80 lb and 20/25/30 kg pre-mix bags to decide between ready-mix delivery or pallet pickup.
Builder-friendly Outputs
Automatic conversions to cubic yards, meters, and feet with overage guidance baked in.
How to Use the Concrete Calculator
Select the pour shape, pick your preferred measurement system, and supply the requested dimensions. The tool applies the correct formula for each project type, converts between imperial and metric units, and sums the total concrete volume. Bag counts use common yield values so you can compare pre-mix options or ready-mix delivery quickly.
Smart Planning Tips
- Always round up concrete orders to allow for site spillage, uneven subgrades, or form swell.
- Keep reinforcement, vapor barriers, and compaction in mind—volume estimates assume forms are square and level.
- Order a little extra for edges, steps, and pump priming if you are hiring a concrete pump truck.
Reference Yield Table
| Bag Size | Approx. Yield | Best For |
|---|---|---|
| 40 lb (18.1 kg) | 0.30 ft³ / 0.008 m³ | Small slab patches, post holes, repairs |
| 60 lb (27.2 kg) | 0.45 ft³ / 0.013 m³ | Sidewalk panels, small pads, footings |
| 80 lb (36.3 kg) | 0.60 ft³ / 0.017 m³ | Driveways, shed slabs, larger pours |
Reference this content, page, or tool as:
"Concrete Calculator 🧱" at https://MiniWebtool.com// from MiniWebtool, https://MiniWebtool.com/
by miniwebtool team. Updated: Oct 12, 2025