Quick answer
Enter the pour length, width, thickness and waste to estimate how much concrete a screed-formed slab or pour needs in cubic yards and cubic meters. Confirm the final order with the supplier after checking access and site conditions. Use the working RenoMetric calculator below for the actual estimate, then use this page to check assumptions, package rounding and project-specific considerations.
What you will get
Use your measurements to see the estimated project quantity.
Add waste and round to complete bags, boxes, cans, bundles or delivery quantities.
Review product coverage, site conditions, local requirements and supplier details before ordering.
Working concrete screed calculator
Before you buy
Use the calculator result as a planning quantity, then verify the final order with the product label or supplier quote.
Open the working Concrete calculator
Formula
Worked planning example
A 20 ft × 12 ft pour at 4 in is about 2.96 yd³ before the selected ordering allowance. Confirm the final order with the supplier and placement crew.
Common uses
- Slab screeding
- Garage pads
- Patios
- Driveway sections
How to get a better estimate
Measure the actual project rather than relying on listing dimensions. For irregular spaces, split the surface into simple measurable sections and add the results. Use the exact product label for package coverage, yield, density or square-foot coverage whenever it is available.
Keep waste and package rounding as separate steps. Waste covers cuts, breakage, pattern matching and unavoidable offcuts. Package rounding reflects the fact that many materials are sold only in complete bags, boxes, bundles or cans.
Before you buy: this page is a planning guide, not a contractor quotation or structural design. Verify final quantities with the product manufacturer, supplier or installer when project conditions could materially change the result.
Concrete Screed Calculator: How Much Concrete Do I Need? FAQ
How much concrete do I need for a screed?
Calculate length × width × thickness, convert the volume to cubic yards or cubic meters, add a stated waste allowance and confirm the supplier delivery increment. Screeding changes finishing, not the geometric volume.
What does screed mean in concrete work?
A screed is used to strike off and level freshly placed concrete; the required concrete quantity still comes from the pour geometry.
Does screeding change the concrete volume?
No. Screeding affects placement and finishing, while quantity comes from the actual pour dimensions and thickness.
Should I include a waste allowance?
Usually keep an explicit allowance for measurement variation, subgrade irregularity and placement loss, then confirm supplier order increments.