How heavy is a 10 mm steel plate per square meter?

78.5 kg/m² — kg/m² is simply 7.85 × thickness in mm. Common values: 6 mm = 47.1, 8 mm = 62.8, 10 mm = 78.5, 12 mm = 94.2, 20 mm = 157 kg/m².

How many 4x8 steel plates are in a ton?

Depends on thickness. A 4×8 ft (1220×2440 mm) plate is ≈ 2.98 m²: at 6 mm ≈ 140 kg (7 pieces per ton), at 10 mm ≈ 233 kg (4 per ton), at 3 mm ≈ 70 kg (14 per ton).

How many tons of steel plate fit in a container?

A 20ft container carries about 18–22 tons of plates and a 40ft about 24–26 tons, limited by floor loading and bundle size. Cut-to-size plates pack efficiently; Nikasteel mixes thicknesses and sizes in one container with trial orders from 5 tons.

Steel Plate Weight Calculator — kg per Plate & m²

Q: How do I calculate the weight of a steel plate?

Weight (kg) = 7.85 × thickness (mm) × width (m) × length (m) — steel density 7.85 t/m³. A 10 mm plate 1500 × 3000 mm weighs 7.85 × 10 × 1.5 × 3 = 353 kg. The formula works for all carbon steel plates; stainless (304/316, 7.93 t/m³) is about 1% heavier.

Q: Is theoretical plate weight the same as invoiced weight?

Usually close but not identical. Mills invoice on actual weighbridge weight (or theoretical by agreement); actual weight typically falls within ±2–4% of the theoretical value from dimensions. State the weight basis on the proforma invoice — see our steel price structure guide.

① Plate Weight

Per plate: -- kg

Total: --

kg = density × thickness (mm) × width (m) × length (m)

② Cut-to-Size Yield Estimator

How many pieces can we cut from one mill sheet? (area-based estimate, no kerf allowance)

Pieces per sheet (same orientation): --

Best of both orientations: --

Final cutting plan accounts for kerf (~3–5 mm), edge trim and grain direction

③ kg/m² Quick Reference

Weight per m²: --

Per ton you get: -- m²

kg/m² = 7.85 × thickness (mm) — works for every flat carbon product

Thickness	kg/m²	1500×3000 sheet	1220×2440 (4×8ft) sheet	2000×6000 sheet
3 mm	23.6	106 kg	70 kg	283 kg
4 mm	31.4	141 kg	94 kg	377 kg
5 mm	39.3	177 kg	117 kg	471 kg
6 mm	47.1	212 kg	140 kg	565 kg
8 mm	62.8	283 kg	187 kg	754 kg
10 mm	78.5	353 kg	233 kg	942 kg
12 mm	94.2	424 kg	280 kg	1130 kg
16 mm	125.6	565 kg	373 kg	1507 kg
20 mm	157.0	707 kg	467 kg	1884 kg
25 mm	196.3	883 kg	583 kg	2355 kg

The Formula Behind the Calculator

Plate weight: kg = density × thickness (mm) × width (m) × length (m). Carbon steel density is 7.85 t/m³; stainless 304/316 is 7.93 (≈ +1%), 430 is 7.70.
Per m²: kg/m² = density × thickness (mm) — the fastest mental math for flat products at any size.
kg per foot of 4×8 ft sheet: 2.977 m² × 7.85 × t — e.g. 6 mm = 140 kg, which is why 4×8 plates quote conveniently "per piece".
Theoretical vs invoiced: mills invoice on weighbridge weight or agreed theoretical basis (±2–4% band). How quotes exploit the difference is in our steel price structure guide.

Container Planning Cheat-Sheet

20ft container: ≈ 18–22 tons of bundled plates
40ft container: ≈ 24–26 tons
Cut-to-size plates stack flat and pack efficiently; mixed thicknesses/sizes in one container, trial orders from 5 tons

FAQ

How do I calculate the weight of a steel plate?

kg = 7.85 × thickness (mm) × width (m) × length (m). Example: 10 mm × 1.5 m × 3 m = 353 kg. Stainless 304/316 runs about 1% heavier.

How many 4×8 ft plates make a ton?

At 3 mm ≈ 14 plates, at 6 mm ≈ 7 plates, at 10 mm ≈ 4 plates per ton (1220×2440 mm sheet).

Does Q235B weigh the same as A36 or S355JR plate?

Yes — weight depends only on dimensions and density, not the grade. Equivalences between GB and foreign grades are in our GB equivalents chart and stainless equivalents.

Is theoretical plate weight the same as invoiced weight?

Usually within ±2–4%. Confirm the weight basis (theoretical vs weighed) on the proforma invoice before comparing quotes.

Get Exact Plate Weights & FOB Prices

Send your thickness × size list to [email protected] or WhatsApp +86 191 5745 8011 — weights, EXW/FOB pricing and cut-to-size plan within 24 hours. Plates to ASTM, EN, JIS and GB standards with EN 10204 3.1 MTC; sizes and availability on the Q235B plate page, grade selection in the plate grades guide and the steel plate product page.

Steel Plate Weight Calculator