Bitumen Calculator

Calculate the exact amount of bitumen needed for any road, driveway, or paving project. Enter your area and depth to get an instant material estimate.

Length feet Length of the area to be paved Please enter a positive number

Width feet Please enter a positive number

Depth inches Standard driveway: 3–4 inches Please enter a depth between 1–36 inches

Bitumen grade Standard grade suits most driveways

Calculation Results

Bitumen needed

— tons

Based on standard density of 145 lb/ft³

How to use this calculator

Enter your area dimensions

Input the length and width of the surface you need to pave, in feet.

Set your required depth

Enter how thick the bitumen layer should be. Standard driveways use 3–4 inches; heavy traffic roads use 6+ inches.

Select your bitumen grade

Choose the type of bitumen you're using. Standard 60/70 penetration grade covers most residential projects.

Get your instant result

The calculator shows total tons needed, plus coverage area and estimated cost if you add a price per ton.

Bitumen / Asphalt Paving Volume Matrix (145 lb/ft³ Density)

Paving Area	Asphalt Depth	Volume (Cubic Yards)	Tons Required
500 sq ft	2 inches	3.1 yd³	6.0 Tons
500 sq ft	3 inches	4.6 yd³	9.1 Tons
500 sq ft	4 inches	6.2 yd³	12.1 Tons
500 sq ft	6 inches	9.3 yd³	18.1 Tons
1000 sq ft	2 inches	6.2 yd³	12.1 Tons
1000 sq ft	3 inches	9.3 yd³	18.1 Tons
1000 sq ft	4 inches	12.3 yd³	24.2 Tons
1000 sq ft	6 inches	18.5 yd³	36.3 Tons
2500 sq ft	2 inches	15.4 yd³	30.2 Tons
2500 sq ft	3 inches	23.1 yd³	45.3 Tons
2500 sq ft	4 inches	30.9 yd³	60.4 Tons
2500 sq ft	6 inches	46.3 yd³	90.6 Tons
5000 sq ft	2 inches	30.9 yd³	60.4 Tons
5000 sq ft	3 inches	46.3 yd³	90.6 Tons
5000 sq ft	4 inches	61.7 yd³	120.8 Tons
5000 sq ft	6 inches	92.6 yd³	181.3 Tons
10000 sq ft	2 inches	61.7 yd³	120.8 Tons
10000 sq ft	3 inches	92.6 yd³	181.3 Tons
10000 sq ft	4 inches	123.5 yd³	241.7 Tons
10000 sq ft	6 inches	185.2 yd³	362.5 Tons
20000 sq ft	2 inches	123.5 yd³	241.7 Tons
20000 sq ft	3 inches	185.2 yd³	362.5 Tons
20000 sq ft	4 inches	246.9 yd³	483.3 Tons
20000 sq ft	6 inches	370.4 yd³	725.0 Tons

Frequently asked questions

How much bitumen do I need per square foot?

For a standard 4-inch deep layer, you need approximately 0.05–0.06 tons of bitumen per square foot. A typical single-car driveway of 600 square feet requires around 3–4 tons of bitumen. Use this calculator to get an exact figure for your specific dimensions and depth requirements.

What is the density of bitumen used in the calculation?

This calculator uses a standard bituminous concrete density of 145 lb/ft³ (approximately 2,322 kg/m³), which is the industry standard for compacted asphalt and bitumen mixes. Modified PMB grades use a slightly higher density of 148 lb/ft³ due to the polymer additives.

What depth of bitumen do I need for a residential driveway?

Residential driveways typically require 3–4 inches of compacted bitumen. For areas with heavier vehicle traffic like RVs or delivery trucks, 4–6 inches is recommended. Commercial roads and car parks generally need 6–8 inches depending on load requirements and local building codes.

How accurate is this bitumen calculator?

This calculator provides estimates accurate to within 5–10% for standard projects. Real-world usage may vary due to site conditions, wastage, compaction ratios, and supplier tolerances. We recommend adding a 10% buffer to your calculated amount when ordering materials from a supplier.

What is the difference between bitumen grades?

60/70 penetration grade is the standard bitumen used for most roads and driveways. PMB (Polymer Modified Bitumen) is a premium grade with polymer additives that improves durability, flexibility, and resistance to rutting — typically used for high-traffic commercial applications. Cutback bitumen is diluted with a solvent for cold-weather applications or surface dressing.

About this calculator

This bitumen calculator estimates the total weight of bituminous material required to pave a given area at a specified depth. It's designed for contractors, homeowners, and project managers who need a quick and reliable material estimate before requesting supplier quotes or submitting project tenders.

The calculation uses the standard volume-to-weight formula for compacted bituminous materials:

Volume (ft³) = Length × Width × (Depth ÷ 12)
Weight (tons) = Volume × Density (145 lb/ft³) ÷ 2,000

Always add a 10% wastage buffer to any calculated quantity when placing orders. Actual material requirements can vary based on site preparation quality, sub-base condition, compaction method, and ambient temperature during installation. For large commercial projects, consult a qualified civil engineer to confirm material specifications.