Use this page as an estimating workflow rather than a specification. Build the quantities in the order shown, use the linked calculators for the arithmetic, then verify every product-specific value against the material you intend to buy.
Measure the finished paving area
Measure the actual paved footprint, splitting L-shapes or separate zones into rectangles. Keep the raw measurements because every downstream quantity depends on this area.
Calculate slabs separately from the layers below
Slab quantity should use the exact product dimensions or, preferably for real purchasing and mixed-size packs, the manufacturer/supplier stated pack coverage. Keep any cutting or breakage allowance separate and visible.
Treat depth as a project input
Sub-base and bedding depths depend on the project build-up and ground conditions. Enter the depth specified for the job rather than relying on a generic value.
Convert the estimate into realistic order units
Bulk material may be sold by tonne, bulk bag or small bag. Slabs are sold in packs or project packs. Round at the purchasing stage and compare against supplier pack coverage.
Calculators for this job
Common mistakes
- Forgetting to include edge cuts and awkward corners
- Using loose depth where the project calls for a compacted layer
- Assuming every bulk bag has the same mass or coverage
- Ordering slabs by square metres without checking the pack layout
Pre-order checklist
- Re-measure the main dimensions or compare them with a current drawing.
- Replace generic coverage, density, spacing or pack figures with the actual product data.
- Keep the base quantity, waste allowance and pack rounding as separate steps.
- Check whether any part of the job requires professional design, approval or a manufacturer-specific installation method.
- Save the raw measurements so the estimate can be reproduced if the supplier queries it.
The project planners deliberately stop at quantity planning. They do not certify structural adequacy, regulatory compliance or installation suitability.