How Much Does 3 mm Steel Plate Weigh?

Short answer: 3 mm mild steel weighs 23.55 kg per square metre. 304 stainless weighs 23.79 kg/m² and 316 stainless 23.94 kg/m².

The formula

Weight (kg) = length (m) × width (m) × thickness (mm) × density ÷ 1000.

Densities: mild steel 7,850 kg/m³, 304 stainless 7,930 kg/m³, 316 stainless 7,980 kg/m³.

Weights of common 3 mm sizes

• 100 × 100 mm: mild 0.24 kg, 304 0.24 kg, 316 0.24 kg

• 300 × 300 mm: mild 2.12 kg, 304 2.14 kg, 316 2.15 kg

• 500 × 500 mm: mild 5.89 kg, 304 5.95 kg, 316 5.99 kg

• 1000 × 1000 mm: mild 23.55 kg, 304 23.79 kg, 316 23.94 kg

• 1000 × 2000 mm (full sheet): mild 47.10 kg, 304 47.58 kg, 316 47.88 kg

• Disc Ø300 mm: mild 1.66 kg, 304 1.68 kg, 316 1.69 kg

• Strip 50 × 1000 mm: mild 1.18 kg, 304 1.19 kg, 316 1.20 kg

Real sheet is rolled to a thickness tolerance, so actual weight can differ by a few per cent.

Questions

Is stainless heavier than mild steel?

Slightly. For the same size, 304 is about 1% heavier and 316 about 1.7% heavier.

Why does weight matter for delivery?

Orders up to 30 kg, with no piece longer than 1000 mm or wider than 700 mm, go by £25 parcel to the UK mainland. Heavier or bigger orders go on a pallet priced by postcode. See Delivery.

Buy 3 mm plate cut to size: square plate, rectangular plate, flat strip or discs.