Paver Base Calculator
The base layer is the part of a paver project nobody sees and everybody under-orders. This calculator works out how much compactable aggregate the prepared area needs: enter the patio, walkway or driveway footprint, choose the base depth, and the engine separates the net volume of material in place from the order volume that accounts for compaction and waste. Both figures are shown, because they answer different questions — the net volume tells you what the finished layer holds, the order volume tells you what to buy once loose material is compacted down. A compaction factor is exposed as an editable assumption rather than buried in the maths, so you can match it to the product and specification you are working to. Density, tons and a price field follow the same pattern as the other bulk pages. It is built for anyone laying pavers who needs the quantity of road base, crushed stone or recycled aggregate below the sand and units, not just the visible surface.
Calculator input
Base areas
Use the same shapes as the other bulk calculators.
What this calculator calculates
- Prepared area in square feet across all entered sections
- Net base volume in cubic feet and cubic yards before compaction
- Order volume including the compaction factor and waste allowance
- Estimated tons from the base-material density
- Bag counts where the volume is small enough for bagged product
- Cost estimate from the price you enter per yard or ton
Projects this calculator covers
- Patio baseThe standard 6 in planning layer under a domestic paver patio, compacted in lifts.
- Walkway and path baseA thinner prepared layer for foot traffic, where the ground is usually firmer.
- Driveway baseDeeper layers under vehicle loads — the depth needs site-specific judgement, not a default.
- Step and landing basesSmall, precisely measured pads that still need real aggregate below them.
How the calculation works
The engine separates net volume from compacted order volume and uses the centralized base-material assumptions.
Formula: Net area × depth ÷ 12 = base volume; order volume = net volume × compaction factor × (1 + waste).
Worked example
12 × 20 ft patio base at 6 in
Compaction is an editable assumption in the engine.
Reading the results
- Net volume versus order volume. Compacted base occupies less space than the loose material you buy. The net figure is the volume in the ground; the order figure adds the compaction allowance and waste so the delivery matches the job.
- Why compaction is an input. Different products tighten by different amounts. The default factor is a planning allowance you can change to match the material and the specification you are working to.
- Base depth versus bedding depth. The compactable layer and the thin sand bedding above it are separate calculations with separate depths. Adding them together into one figure is a common source of over-ordering.
- Weight for a load-based order. Base material is dense and often sold by the ton. The weight estimate uses the density shown on the page — replace it with the supplier figure when they quote a product-specific value.
Assumptions
Central engine assumptions can be inspected in the methodology view. User-entered prices never get replaced with invented market prices.
Practical planning guidance
- Confirm base depth against the ground conditions and the intended use rather than accepting the default outright.
- Place and compact the material in manageable lifts; the compaction allowance assumes the layer is actually compressed.
- Measure the prepared footprint after excavation, because the base sits in a wider, deeper hole than the finished surface.
- Keep bedding sand out of this calculation and plan it on the sand page with its own thin depth.
- Ask the supplier whether their product is sold loose or compacted, then set the compaction factor to match.
Common mistakes
- Treating compacted volume and loose order volume as the same figure and arriving short on delivery.
- Using bedding sand thickness as the base thickness, or the reverse.
- Carrying a patio base depth straight into a driveway without considering the vehicle load.
- Ordering base by weight using a density from a different aggregate product.
- Forgetting that excavation and disposal of existing material sit outside the material quantity entirely.
Important limitations
Frequently asked questions
How much paver base do I need?
Measure the prepared area, choose the base depth and calculate. Area times depth gives the volume; the engine then adds the compaction allowance and waste to produce the order quantity.
Why does the calculator show two volumes?
One is the net volume the compacted layer occupies, the other is the loose material you should buy. Compaction reduces volume, so the two figures are deliberately different.
How deep should a paver base be?
The page defaults to a common patio depth and lets you change it. Ground conditions, climate and the intended load all affect what is right, so treat the default as a starting point.
What compaction factor should I use?
The default is a planning allowance. If your supplier or specification quotes a figure for the product, enter it and the order volume follows that instead.
Is paver base sold by cubic yards or tons?
Both are common for compactable aggregate. The result gives volume and weight together so either quote can be checked.
Does this include the bedding sand?
No. Sand is a separate thin layer with its own page and depth. Planning them apart keeps both quantities accurate.
Planning guides
Related calculators
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Enter your dimensions, then calculate. Results stay tied to the tested engine.