Foundationslength x width x depth
Plan Area
Concrete Volume
Approx. CostCalculator
Foundations calculator
Estimate concrete volume and approximate cost for strip foundations, trench fill foundations, and foundation slabs using quick planning dimensions.
Foundation Quantities
Estimate foundation concrete volume and approximate supply cost.
Switch between strip, trench fill, and slab foundations, then use the relevant dimensions, waste allowance, and concrete rate to build a fast planning figure.
Results
Foundation Type-
Plan Area0.00 m2
Depth Used0 mm
Base Volume0.00 m3
Volume Inc. Waste0.00 m3
Rate Per m3£0.00
Approx. Cost£0.00
This tool is for guidance only. Final foundation quantities vary with engineer's design, overbreak, reduced dig, step levels, blinding, reinforcement, and the actual excavation and concrete scope.
What This Tool Helps With
Useful for quick foundation planning checks.
- Sense-check strip, trench fill, and slab concrete quantities early.
- Compare foundation options against a simple concrete rate.
- Allow for waste where excavation tolerance and overbreak affect quantity.
- Export a branded summary for internal review or client discussion.
Important Note
This is a planning tool, not a structural or groundworks check.
Foundation quantities still depend on the engineer's design, actual ground conditions, reduced-level dig, blinding, reinforcement, and the issued groundworks information. Use the calculator as a first pass before ordering concrete or pricing live work.
Related Tools
Useful next calculators and estimating pages.
Concrete Volume Calculator
Useful if the next check is a simpler slab or concrete volume calculation without foundation type switching.
Open Concrete CalculatorExtension Cost Calculator
Useful if the next step is moving from foundation quantities into a broader project budget allowance.
Open Extension CalculatorConstruction Calculators Hub
Browse the full calculator section if you want to compare all available tools in one place.
View CalculatorsCommon Questions
Quick answers about the foundations calculator.
What does the foundations calculator estimate?
The calculator estimates concrete volume and approximate cost for strip foundations, trench fill foundations, and foundation slabs.
Can it be used for strip, trench fill and slab foundations?
Yes. You can switch the foundation type and use the relevant dimensions for strip runs, trench fill runs, or slab length and width.
Why is there a waste allowance on foundations?
Waste allowance helps account for overbreak, irregular excavation, tolerance in levels, and ordering practicalities.
Does this replace a structural or groundworks design check?
No. It is intended for early planning only. Final foundation quantities should always be checked against issued drawings, engineer's information, levels, and the actual groundworks scope.
Next Step
Need a formal estimate beyond a quick foundations quantity check?
Use the calculator as a starting point, then get in touch if you need project-specific estimating support, take-off, or structured quantity review for live construction work.