Steel Surface Area Calculator

Theoretical geometric surface area and the estimated area to be coated, separated for open and hollow sections.

Section

Length (m) Quantity

Coating options Coat inside of hollow sections (e.g. hot-dip galvanizing) Include both end faces Allowance for connections, cleats, stiffeners (%)

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Result – 250UB37.3

Theoretical geometric area

External surface area6.407m²

Internal surface area—m²

Total geometric surface area6.407m²

Practical area to be treated

Estimated coating area6.407m²

External area per metre1.068m²/m

External area per tonne28.64m²/t

Open section: full perimeter coated.
End faces excluded.
Allowance applied: 0.0 %.

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Method & assumptions

External area = Pext × L × N ; Internal area = Pint × L × N ; Coating area = (Pext + k·Pint) × L × N × (1 + allowance) + end areas

Pext / Pint = external / internal coated perimeter (m²/m), k = 1 if the inside is coated (e.g. hot-dip galvanizing) else 0

Theoretical geometric area. Practical treated area depends on the coating system: hollow sections are normally painted externally only, while hot-dip galvanizing coats inside and outside. Add allowances for connections, stiffeners and cleats.