Asphalt Quantity Calculator
Area × thickness × density gives tonnage, then bitumen content.
With the default inputs: Pavement area 10000 m² · Compacted thickness 0.05 · Mix bulk density 2.4 t/m³ etc.Bitumen required 58.29 t
Edit the inputs below to recalculate.Inputs
Result
| Pavement area | 10000m² |
| Compacted thickness | 50mm |
| Net mix weight | 1200.0t |
| Mix with waste | 1224.0t |
| Bitumen | 58.29t |
| Aggregate | 1165.7t |
| Bitumen content of mix | 4.76% |
| Bitumen per m² | 5.83kg/m² |
| Mix per m² | 0.122t/m² |
| 30 t truck loads | 41loads |
Bitumen ratio and bitumen content are different numbers and this is where asphalt take-offs most often go wrong. Ratio = bitumen ÷ aggregate (denominator excludes bitumen); content = bitumen ÷ total mix. A 5% ratio equals 4.76% content — a 0.24 point difference worth tens of tonnes on a big job. Designs quote ratio, test reports quote content; never substitute one for the other. Use bulk density, not maximum theoretical: about 2.40 for AC-13 and 2.42 for AC-20. Thickness is compacted; loose depth needs a 1.15-1.25 factor.
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Formula
| Net mix weight | M = area × thickness × density |
| With waste | M = M × (1 + waste) |
| Bitumen | G = M × ratio ÷ (100 + ratio) |
| Aggregate | G = M − bitumen |
| Bitumen content | content = bitumen ÷ M × 100% |
How to work it out
- Mix tonnage: volume = area × compacted thickness, then tonnage = volume × bulk density (2.35-2.45 t/m³ for AC, 2.4-2.5 for SMA).
- Apply 1-3% placing loss for edges, joints and sampling; thinner layers lose proportionally more.
- Bitumen content is where the trap lies: the bitumen-to-aggregate ratio and the bitumen content of the total mix are different things.
- Convert: content = ratio ÷ (100 + ratio). A 5% ratio is 4.76% content, not 5%.
- Bitumen = mix tonnage × content, so 1000 t at a 5% ratio contains 47.6 t of bitumen, not 50.
Where it goes wrong
- Treating the ratio as content — a 5% ratio is 4.76% content, which is 2.4 t on 1000 t and tens of tonnes over a job.
- Using one bulk density for everything — AC-13 is about 2.40, AC-20 2.42, SMA-13 2.45 and OGFC only 2.0-2.1 because of its voids; the wrong figure is a 15% error.
- Using loose thickness — loose is 1.15-1.25 times compacted, so costing on loose overstates material by 20%.
- Allowing no loss — paver start-up, joints and edge trimming all waste material; 1-3% is the floor and small patching jobs reach 5%.
Material and cost
AC-13 modified mix 550-750 CNY/t, AC-20 500-700, SMA-13 700-950. Penetration grade 70 bitumen 4500-5500 CNY/t, modified bitumen 5500-7000. Paving and rolling 30-60 CNY/t.
On site
- The binder ratio comes from Marshall testing, not from choice; verify by extraction during construction and adjust beyond ±0.3%.
- Place at no less than 140 °C, or 160 °C for modified binder — cool mix cannot be compacted and leads to early rutting and fretting.
- Require at least 96% of Marshall density or 93% of theoretical maximum, verified by cores.
Basis
- JTG F40-2004 Technical specifications for construction of highway asphalt pavements
- CJJ 1-2008 Code for construction and acceptance of urban road works
- JTG E20-2011 Test methods for bitumen and bituminous mixtures for highway engineering
FAQ
What exactly differs between ratio and content?
Why bulk density rather than maximum theoretical?
How is the loose-depth factor used?
Cite this page
Use this format in reports, method statements or coursework. The link is permanent.
Building Calculator. Asphalt Quantity Calculator. 2026-10-25. https://jianzhujisuan.com/en/asphalt-quantity