How do you calculate coating weight?

Multiply the coated area by the coating weight per area, by the number of sides, then convert ounces to pounds. With 1,000 ft² at 0.9 oz/ft², one side, and a 0.0625 lb/oz factor, total coating weight is 56.25 lb.

What does G90 mean in oz/ft²?

G90 is a galvanized coating class specifying 0.90 oz/ft² of zinc as a triple-spot total-both-sides minimum. That is why 0.9 oz/ft² is the default coating weight per area in this calculator.

Is coating weight measured per side or total both sides?

Galvanized classes like G60 and G90 are quoted as total both-sides weight, so a single-side figure is roughly half. Set number of sides to 1 when the per-area value already represents both sides, or to 2 if you are building up from a single-side weight.

Why convert ounces to pounds with 0.0625?

There are 16 ounces in a pound, so 1 oz equals 1/16 or 0.0625 lb. The factor turns the oz/ft² coating class into pounds for the full coated area.

How much zinc is on a coil order?

Take the coil's total surface area, multiply by the coating class in oz/ft², then by 0.0625. For 1,000 ft² of G90 that is 56.25 lb of zinc, useful for both costing and zinc-pot consumption planning.

What is a good coating weight for outdoor steel?

For exterior structural and roofing applications, G90 (0.90 oz/ft²) is the common minimum, while harsh or coastal exposure often calls for G115 or hot-dip galvanizing well above 1 oz/ft².

Metals, Steel, Aluminum & Coil Processing calculator

Coating Weight Calculator

Coating weight is the total mass of zinc, aluminum, or organic coating deposited on a sheet or coil, expressed in pounds for a given coated area. Coil coaters, galvanizers, and metal service centers use it to verify they are meeting a specified coating class such as G60 or G90 and to forecast zinc consumption. Because coating classes are quoted in ounces per square foot of total both-sides weight, converting to pounds for a real production run is a constant on-floor task. Getting it right protects corrosion warranties and keeps zinc usage on budget.

What this calculator does

Estimate the coating weight on a coil or sheet from coated area, the coating weight per square foot, the number of sides, and an ounces-to-pounds factor.
Use it when a quality or process engineer needs the zinc or coating weight on a galvanized or coated coil for spec and cost checks.
It converts a coated area and a per-area coating class into total coating mass in pounds across the specified number of sides.

Formula used

Coating weight = coated area × coating weight per area × number of sides × ounces to pounds factor
Coating classes such as G60 or G90 are quoted in ounces per square foot.

Inputs explained

Coated steel area:
Zinc coating class weight:
Coated sides:
Ounce-to-pound conversion:

How to use the result

Use it when verifying a galvanized or coil-coated order against its specified coating class, or when estimating zinc or paint draw for a production run.
Coating-class designations like G90 are nominal triple-spot minimums for total both-sides weight; actual deposited weight varies across the strip and edge effects mean a single calculation will not match every test point.

Current U.S. benchmarks

The producer price index for steel mill products stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The producer price index for aluminum mill shapes stands at 404.859 (BLS, May 2026), up 36.8% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The producer price index for copper and brass mill shapes stands at 559.593 (BLS, May 2026), up 76.8% from a year earlier. Quotes priced off last quarter's material cost miss this move. Global copper trades at $13,484 per tonne (IMF via FRED, May 2026).

Common questions

How do you calculate coating weight? Multiply the coated area by the coating weight per area, by the number of sides, then convert ounces to pounds. With 1,000 ft² at 0.9 oz/ft², one side, and a 0.0625 lb/oz factor, total coating weight is 56.25 lb.
What does G90 mean in oz/ft²? G90 is a galvanized coating class specifying 0.90 oz/ft² of zinc as a triple-spot total-both-sides minimum. That is why 0.9 oz/ft² is the default coating weight per area in this calculator.
Is coating weight measured per side or total both sides? Galvanized classes like G60 and G90 are quoted as total both-sides weight, so a single-side figure is roughly half. Set number of sides to 1 when the per-area value already represents both sides, or to 2 if you are building up from a single-side weight.
Why convert ounces to pounds with 0.0625? There are 16 ounces in a pound, so 1 oz equals 1/16 or 0.0625 lb. The factor turns the oz/ft² coating class into pounds for the full coated area.
How much zinc is on a coil order? Take the coil's total surface area, multiply by the coating class in oz/ft², then by 0.0625. For 1,000 ft² of G90 that is 56.25 lb of zinc, useful for both costing and zinc-pot consumption planning.

Last reviewed 2026-05-12.