Asphalt Calculator NZ
Calculate asphalt in metric units following NZTA standards.
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NZTA Standards
All metric units (m², mm, tonnes)
Results (Metric)
Asphalt Required
0 tonnes
Area
0 m²
Coverage Rate
0 kg/m²
🇳🇿 NZTA Specification
NZTA Reference
NZ Transport Agency specifies asphalt mixes under M/10 specification. Common mixes include AC10, AC14, and AC20 for different applications. Consult your local contractor for specific requirements.
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How Asphalt Calculator NZ Works
Visual calculation flow
L × W Area (m²)
→ × Thickness mm ÷ 1000
→ M/10 Density kg/m³
→ Result tonnes
Tonnes = L(m) × W(m) × T(mm÷1000) × Density ÷ 1000 Step 1: Enter dimensions in meters. Area = Length × Width (m²).
Step 2: Select thickness in mm. Converted to meters by dividing by 1000.
Step 3: Choose NZTA M/10 mix type (AC10, AC14, AC20, SMA, OGPA) - each has a specific density.
Step 4: Volume × Density = kg, then ÷ 1000 = tonnes. Coverage rate shown as kg/m².
Asphalt Calculator New Zealand FAQs
What NZTA M/10 specification should I follow?
NZTA M/10 covers asphalt specification in New Zealand. For driveways, AC10 or AC14 mixes are common. OGPA (Open Graded Porous Asphalt) is used for highways to reduce spray. SMA provides premium durability for high-traffic areas. Always ensure your contractor follows current NZTA specifications.
How thick should asphalt be for NZ driveways?
For residential driveways in New Zealand, 25-30mm of AC10 or AC14 over a compacted basecourse is typical. Commercial areas need 40-50mm. The basecourse should be minimum 100mm of GAP 40 or GAP 65 aggregate, properly compacted to 98% MDD (Maximum Dry Density).
What is the cost of asphalt in New Zealand?
Asphalt in New Zealand costs approximately $180-$280 NZD per tonne for material (2024). Installed driveway costs range from $70-$120 NZD per square metre. Auckland, Wellington, and Christchurch have the most competitive pricing. South Island rural areas may see higher costs due to transport.
Can asphalt be laid year-round in New Zealand?
Unlike many countries, New Zealand's mild climate allows asphalt paving most of the year, especially in North Island. However, avoid wet conditions and temperatures below 10°C. South Island alpine regions have a shorter season (October-April). Rain is the biggest concern - surfaces must be dry for proper adhesion.
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