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T-11Free calculator

Paint & coating calculator.

Litres of paint per coat from surface area, dry film thickness, volume solids and application losses.

CoatDFT (µm)Volume solids (%)
Primer
Intermediate
Topcoat

Set a coat's DFT to 0 to leave it out. Take DFT and volume solids from the coating specification and product data sheet.

Method

How it's calculated.

The theoretical spreading rate of a paint depends on its volume solids and the dry film thickness:

TSR (m²/L) = 10 × volume solids (%) ÷ DFT (µm)

Litres = area ÷ TSR ÷ (1 − loss)

Losses cover overspray, surface roughness, complex sections and wastage. Typical structural steel surface areas run from roughly 10 to 40 m² per tonne depending on section sizes; take it from the drawings where possible.

Related reading: ISO 12944 coatings and galvanising.

Estimates for planning and education only. Verify against the applicable code edition, manufacturer data and a competent engineer.

Beyond the calculator

Need it fabricated or installed?

Drawings, a bill of quantities or a description of the problem. An engineer reviews every enquiry and comes back to you directly.

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