Free paving calculators
Check the figures.
Work out driveway area, asphalt, paving packs, sub-base quantities and selling prices. Bring your own checked measurements and supplier figures.
No login required. All five calculators run entirely in your browser.
Asphalt tonnage calculator
How much asphalt do you need?
Enter the finished compacted depth and its matching density. The figures shown below are examples, so replace them with your supplier's information.
Material to order
We round the result to three decimal places. Check the site measurements and supplier requirements before you order.
How is asphalt tonnage calculated?
Asphalt mass in metric tonnes = area in m² × compacted depth in mm ÷ 1,000 × compacted density in tonnes/m³. Multiply that result by (1 + ordering allowance ÷ 100) to include your allowance.
Worked example: 80 m² at 50 mm compacted depth and a matching density of 2.4 tonnes/m³ gives 9.600 metric tonnes before allowance. With a 5% ordering allowance, the quantity is 10.080 metric tonnes. These are example inputs, not a recommended depth, density or allowance for your job.
Use the density for the specified compacted material, not loose delivery density. Confirm the figures and ordering units with your supplier. Read the asphalt tonnage guide for the calculation and checks before ordering.
Need to turn that quantity into a quote?
Pave Measure is being built to take your measurements through costing and into a checked PDF quote on iPhone.
See how the app works · Check our calculation methodFree paving calculator
How many packs should you order?
Start with the checked area and the coverage printed by your supplier. We will round the result up to whole packs.
Your pack order
How we work it out
Required coverage = net area × (1 + allowance ÷ 100). Divide that by the coverage per pack, then round up to a whole pack. For an area of 47 m², a 7% allowance and packs covering 8.5 m², you would order six packs covering 51 m².
Pack rounding is not the same as your allowance. Before ordering, check the product, pattern, contents of each pack and any separate border requirements. This calculator works out coverage, not whether the construction is suitable for the site.
Read the paving blocks and packs guideMeasure the job
Driveway area calculator
Combine a rectangle and an optional triangle, then subtract excluded areas. Use perpendicular height for the triangle. Sections must not overlap.
Net plan area
Example: 8 × 5 m, minus a 2 m² bed, gives 38 m². Adding a separate triangle with a 4 m base and 2 m height adds 4 m², giving 42 m².
For more complex sites, calculate separate non-overlapping sections and add their areas. This tool calculates horizontal plan area, not slope-adjusted surface area.
Read the driveway measurement guideEstimate materials
Sub-base quantity calculator
Calculate geometric volume from your specified area and compacted depth. Add a matching supplier-provided compacted density if you need metric tonnes.
Material quantity
Example: 40 m² × 150 mm ÷ 1,000 gives 6 m³ compacted volume. The depth is an example, not a construction recommendation.
The displayed volume is not loose delivery volume. Confirm the supplier’s density basis and ordering units. An allowance does not convert compacted volume into loose volume; do not add an unexplained compaction factor.
Read the paving layers and sub-base guidePrice the work
Markup and gross margin calculator
Compare the two pricing methods using the same cost and percentage. Use your complete cost basis; the result does not set tax or recommend a profit target.
Selling prices before tax
Example: A cost of 3,000 with 25% markup gives 3,750. A target 25% gross margin gives 4,000. Markup is measured against cost; gross margin is measured against selling price.
Markup price = cost × (1 + percentage ÷ 100). Margin price = cost ÷ (1 − percentage ÷ 100). Values use your input currency without exchange-rate conversion.
Read the markup and margin guide