Tarmac Calculators
Professional estimation tools for paving and surfacing projects. Accurately calculate tarmac quantities, estimate driveway installation and repair costs, and determine sub-base material requirements for your project.
Available Tarmac Tools
5 Calculators AvailableTarmac Driveway Cost Calculator
Estimate the total installed cost of a new tarmac driveway based on area, thickness, and preparation requirements.
Tarmac Quantity / Tonnage Calculator
Calculate how much tarmac you need by volume, weight, and metric tonnes for your paving project.
Tarmac Repair & Resurfacing Cost Calculator
Estimate costs for fixing, patching, overlaying, or fully resurfacing an existing tarmac surface.
Tarmac Sub-Base Calculator
Calculate the quantity of MOT Type 1 or granular sub-base material required before laying tarmac.
Tarmac Surface Cost Calculator
Access cost estimates for project types like private roads, pathways, car parks, and premium coloured tarmac.
Precision Paving Estimates
Paving materials are expensive, and ordering the incorrect amount can lead to costly delays or wasted material. Our calculators help contractors and homeowners estimate properly.
- 1Cost Planning: Get realistic brackets for new driveways and resurfacing based on industry norms.
- 2Material Ordering: Calculate required tonnage of wearing course, base course, and granular sub-base.
- 3Repair Assessments: Understand the financial difference between patching, overlaying, and full-depth reconstruction.
Paving Tips & Best Practices
Check the Sub-Base
A driveway is only as strong as its foundation. Never skimp on the MOT Type 1 sub-base depth and compaction; it prevents rutting.
Account for Wastage
When ordering tarmac or sub-base tonnage, always factor in 5% to 10% extra for wastage, compaction variations, and edge spillage.
Drainage is Critical
Ensure your design incorporates proper falls (slopes) or linear drainage to prevent standing water, which degrades paving rapidly.
Tarmac & Paving FAQs
What is the difference between tarmac and asphalt?+
While frequently used interchangeably, true tarmac (tarmacadam) relies on a tar-based binder, whereas asphalt uses bitumen—a petroleum by-product. Modern paving almost universally uses asphalt (bitumen macadam or SMA) due to superior durability and environmental safety, even though contractors still colloquially refer to it as 'tarmacking'.
How do I calculate how much tarmac I need?+
To calculate tarmac tonnage, you multiply the surface area (length × width) by the desired compacted depth to find the volume, then multiply by the material's density (typically 2.3 to 2.4 tonnes per cubic meter). Always add a 5% to 10% wastage factor to account for site irregularities.
How thick should a tarmac driveway be?+
A standard domestic driveway typically features a 50mm base course (binder course) topped with a 25mm to 30mm surface course (wearing course), bringing the total tarmac thickness to roughly 75mm to 80mm. This sits upon a compacted MOT Type 1 sub-base, usually 150mm thick.
Is it cheaper to repair or replace a tarmac driveway?+
Patching small potholes or cracks is significantly cheaper than replacing. If the structural integrity of the base is sound, an 'overlay' or 'resurfacing' (adding a new surface layer) offers a middle-ground cost. Full replacement is the most expensive but is necessary if the sub-base is failing or the surface is extensively crazed.
What is MOT Type 1 and why do I need it?+
MOT Type 1 is a granular aggregate sub-base material (often crushed stone or concrete) that compacts to create a highly stable, load-bearing layer. A strong sub-base is essential under tarmac to prevent the surface from sinking, rutting, or cracking under vehicle weight.