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Asphalt Calculator Metric

Complete metric system calculator for international asphalt projects.

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Full Metric Calculator

m, m², mm, kg, tonnes

Dimensions
Mix Properties

Metric Results

Area

0

Total Mix

0 tonnes

0 kg

Bitumen

0 kg

0 t

Aggregates

0 kg

0 t

Volume

0

Coverage Rate

0 kg/m² at specified thickness

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Metric Standards

Typical Metric Densities

Mix TypeDensity
Open Graded Friction Course2,200-2,280 kg/m³
Dense Graded HMA2,300-2,400 kg/m³
Stone Mastic Asphalt (SMA)2,350-2,450 kg/m³
Porous Asphalt2,000-2,200 kg/m³

Metric to Imperial

Length

1 m = 3.281 ft

1 km = 0.621 miles

Area

1 m² = 10.764 sq ft

1 m² = 1.196 sq yd

Mass

1 kg = 2.205 lbs

1 tonne = 1.102 tons

Thickness

25 mm = 1 inch

50 mm = 2 inches

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How Asphalt Calculator Metric Works

Visual calculation flow

Dimensions m/km × m/cm
Normalize All to meters
Volume
Results tonnes + breakdown
Tonnes = L(m) × W(m) × T(mm÷1000) × Density ÷ 1000

Step 1: Enter dimensions with flexible units (length in m/km, width in m/cm, thickness in mm/cm).

Step 2: All units are normalized to meters internally for consistent calculation.

Step 3: Volume (m³) × Density (kg/m³) = Weight (kg). Bitumen/aggregate breakdown by percentage.

Step 4: Results in kg and tonnes with coverage rate (kg/m²) for material planning.

Metric Asphalt Calculator FAQs

How do I convert asphalt measurements from imperial to metric?
Key conversions: 1 foot = 0.3048 meters, 1 inch = 25.4 mm, 1 square yard = 0.836 m², 1 US ton = 0.907 tonnes. For quick area estimates, multiply square feet by 0.093 to get square meters. This calculator handles all conversions automatically.
What countries use the metric system for asphalt?
Most of the world uses metric measurements including the EU, UK (partially), Australia, New Zealand, Canada (officially metric), India, Japan, and virtually all of Asia, Africa, and South America. Only the US, Myanmar, and Liberia primarily use imperial units for construction.
What is the standard metric asphalt layer thickness?
International standards recommend: 25-40mm for residential driveways, 40-60mm for parking areas, 50-80mm for local roads, and 80-150mm+ for highways (multiple layers). Base courses are typically 50-100mm, while surface courses are 25-50mm.
How does metric asphalt density compare to imperial?
Standard asphalt density is 2350 kg/m³ in metric, which equals approximately 145 lb/ft³ or 2.35 tonnes/m³. To convert: kg/m³ ÷ 16.02 = lb/ft³. The physical density is the same regardless of measurement system—only the units differ.

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