Estimate concrete volume, cubic yards, cubic meters, bag count, truckloads, wet weight, waste allowance, and material cost for slabs, footings, columns…
Concrete estimator
Estimate concrete volume, cubic yards, cubic meters, bag count, truckloads, waste allowance, wet weight, and material cost for slabs, footings, columns, piers, and post holes.
Total concrete needed
3.26 yd³2.49 m³ including 10% waste| Scenario | Concrete | Bags | Est. Cost |
|---|---|---|---|
| 0% waste | 2.96 yd³ | 134 | $444 |
| 5% waste | 3.11 yd³ | 140 | $467 |
| 10% waste | 3.26 yd³ | 147 | $489 |
| 15% waste | 3.41 yd³ | 154 | $511 |
Formula
Concrete volume is found by multiplying length, width, and depth, then converting cubic feet into cubic yards. The calculator adds a waste allowance so the final estimate is closer to a practical order quantity.
Ordering
Concrete jobs often need extra material because of uneven excavation, subgrade variation, form movement, spillage, and measurement differences. A 5% to 10% allowance is common for simple jobs, while irregular pours may need more.
Always confirm minimum ready-mix orders, bag yields, delivery fees, reinforcement displacement, and local code requirements before purchasing materials.
Use cases
Use it to estimate material needs for small pours, contractor quotes, DIY projects, and job costing before creating an estimate or invoice.
Enter project dimensions and review the volume, bag count, truckload estimate, and material cost before ordering or quoting the job.
Enter project dimensions and review the volume, bag count, truckload estimate, and material cost before ordering or quoting the job.
Enter project dimensions and review the volume, bag count, truckload estimate, and material cost before ordering or quoting the job.
Enter project dimensions and review the volume, bag count, truckload estimate, and material cost before ordering or quoting the job.
Enter project dimensions and review the volume, bag count, truckload estimate, and material cost before ordering or quoting the job.
Enter project dimensions and review the volume, bag count, truckload estimate, and material cost before ordering or quoting the job.
Calculator details
Last updated: July 2026
Formula used
Concrete Calculator uses the values you enter to estimate totals, rates, percentages, payments, balances, or comparison results for planning.
Assumptions
Example calculation
Enter a simple concrete calculator scenario, review the estimated result, then adjust one input at a time to compare outcomes.
When to use this calculator
Estimate concrete for slabs, patios, driveways, sidewalks, and pads
Disclaimer
This calculator is for estimation and educational use only. It does not replace professional financial, tax, legal, mortgage, investment, or accounting advice.
Questions
It estimates concrete volume in cubic yards and cubic meters, plus bag count, truckload equivalents, wet concrete weight, waste allowance, and material cost for slabs, footings, columns, piers, and post holes.
Multiply length by width by thickness. Convert the thickness from inches to feet first, then divide cubic feet by 27 to get cubic yards. Add a waste allowance before ordering.
For straightforward pours, many estimators add about 5% to 10% extra. Irregular excavation, uneven subgrade, complex forms, or small loads may need a larger allowance.
No. It is a planning estimator only. Confirm final quantities, minimum orders, reinforcement displacement, delivery fees, local code requirements, and site conditions with a qualified contractor or supplier.
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