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 – 12RB

Theoretical geometric area

External surface area0.226m²

Internal surface area—m²

Total geometric surface area0.226m²

Practical area to be treated

Estimated coating area0.226m²

External area per metre0.038m²/m

External area per tonne42.46m²/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.