Galvanizing Cost Calculator
Estimate the hot-dip galvanizing cost per tonne of steel from section thickness and the working zinc price. A quick, transparent estimate built from real plant cost structure — no sign-up needed.
Advanced — process cost
- Zinc consumption 55 kg/t
- Zinc cost $160
- Process cost $300
- Margin $69
How galvanizing cost is calculated
Hot-dip galvanizing is priced per tonne of steel. The cost has three parts — the zinc the steel actually consumes, the process cost to run it through the line, and the galvanizer's margin:
Zinc consumption is the variable that catches people out. It depends on surface area per tonne, so thinner sections pick up far more zinc — roughly 70 kg/t for light gauge down to ~38 kg/t for heavy sections. At a zinc price of $2,900/t that swing alone is worth about $90/t.
Worked example
A typical 3–6 mm structural job at a $2,900/t zinc price and 15% margin:
- Zinc consumption ≈ 55 kg/t
- Zinc cost = 55 × ($2,900 ÷ 1,000) = $159.5 ≈ $160/t
- Process cost (labour, energy, flux) ≈ $300/t
- Direct cost = 160 + 300 = $460/t
- Margin at 15% ≈ $69/t
- Selling price = 460 + 69 ≈ $529/t (≈ $0.53/kg)
This estimator uses the same structure. The full HDG Service Cost Calculator refines it with material-specific coating classes to ISO 1461 / ASTM A123, every service add-on, live zinc pricing and a signed PDF breakdown you can send with a quote.
The full calculator adds
- Material & coating class to ISO 1461 / ASTM A123
- Service add-ons — passivation, double-dip, centrifuge
- SAR / USD / EGP and a full line-item breakdown
- Downloadable PDF to send with your quote
Questions
How is hot-dip galvanizing cost calculated?
Cost per tonne = zinc cost (zinc consumption per tonne × zinc price) + process cost (labour, energy, flux, consumables) + margin. Zinc consumption depends mainly on steel thickness and surface area.
How much zinc does galvanizing consume per tonne?
Typically 38–70 kg of zinc per tonne of steel. Thinner sections have more surface area per tonne and pick up more zinc; heavy sections pick up less.
Why does thickness change the price so much?
Galvanizing coats surface, but you buy and sell by weight. A tonne of thin steel has far more surface area than a tonne of heavy sections, so it consumes more zinc per tonne — and zinc is the largest variable cost.
Is this calculator free?
Yes — the quick estimate is free and needs no sign-up. The full HDG Service Cost Calculator adds coating classes, every service add-on, multi-currency and a PDF export for members.