Tack Coat & Prime Coat Calculator

Inputs

Application Type

Typical rates: tack 0.2–0.5 L/m², prime 0.5–1.0 L/m². Confirm with your spec.

Area (m²)

Tip: use the Asphalt Tonnage calculator to get your paving area.

Application Rate (L/m²)

Waste / Spray Loss (%)

Allows for wind drift, overlaps, and cleanup.

For estimation purposes only. Terms of Use

Result

—

litres of emulsion

Area—

Rate—

US gallons—

Imp gallons—

How to Calculate Tack Coat

Get the paving area in square metres (length × width of the surface being overlaid).
Choose your application rate: tack coat is usually 0.2–0.5 L/m²; prime coat 0.5–1.0 L/m² — follow the project spec.
Multiply area × rate, then add spray loss: multiply by 1 + waste% and compare with your distributor's tank capacity.

Formula Used

Emulsion (L) = Area × Application rate × (1 + Waste %)

Worked Example

A 2,000 m² resurfacing job at 0.35 L/m² with 5% spray loss:

Emulsion = 2000 × 0.35 × 1.05 = 735 litres
≈ 194 US gallons ≈ 162 Imp gallons

When to Use This Calculator

Use this when ordering emulsion for tack coats before hot-mix overlays, or prime coats on granular base — so the distributor delivers the right volume and you don't run short mid-job.

When Not to Use This Calculator

Actual rates are set by the owner's specification or mix design. This is an estimating tool — always confirm the specified rate before ordering.

Frequently Asked Questions

What's the difference between tack and prime coat? ▾

Tack coat bonds a new asphalt layer to an existing asphalt surface. Prime coat is applied to granular base before paving to bind and seal the surface.

How much tack coat do I need per square metre? ▾

Typically 0.2–0.5 L/m² depending on the surface condition — rougher or more oxidized surfaces take more. Use the spec rate when one is provided.