SKY-001 / Engineering tools
Steel & Aluminum Plate Weight Calculator
Estimate steel, aluminum or custom-density plate mass from rectangular or circular dimensions and quantity. Compare kilograms and pounds.
Calculations run locally in your browser. Using this tool requires no account.
Estimated mass
- Per piece
- 0.2355 kg
- Total quantity (×2)
- 0.471 kg
- Face area (m²)
- 0.005
- Thickness (m)
- 0.006
- Volume per piece (m³)
- 0.00003
- Density used (kg/m³)
- 7850
Presets are nominal reference values, not certified properties. Engineering ToolBox lists steel at 7,850 and aluminum at 2,712 kg/m³; grades, alloy composition and temperature change density. Use supplier data as a custom density when available. Engineering ToolBox: Metals and Alloys — Densities
Formula and worked example
Convert dimensions to meters first. Rectangle: A = length × width. Circle: A = π × (diameter/2)². Volume V = A × thickness. Mass per piece = V × density; total mass = mass per piece × quantity. Pounds = kilograms / 0.45359237.
Example: a 100 × 50 × 6 mm steel rectangle at 7,850 kg/m³ has area 0.005 m², volume 0.00003 m³ and mass 0.2355 kg. Two pieces total 0.471 kg.
A solid, uniform plate estimate only: no holes, cutouts, coatings, packaging, scrap or manufacturing tolerances. “Weight” here means mass (kg/lb), not force. This is not a material certificate or load-bearing calculation.
1 in = 25.4 mm and 1 lb = 0.45359237 kg exactly. Unit switches preserve physical dimensions; density remains in kg/m³. Results show up to 10 significant digits. NIST unit conversion tables
Frequently asked questions
Why does my measured plate weigh something different?
Nominal density, actual thickness, alloy, cutouts and manufacturing tolerances can change the measured mass. Use measured dimensions and supplier density for a closer estimate.
Does switching shape keep the other dimensions?
Yes. Rectangle dimensions and circle diameter are retained independently. Hidden dimensions do not participate in the selected shape calculation.
Is this suitable for lifting or structural design?
No. This is a mass estimate, not a lifting plan, strength check or safety certification. Verify the actual part and applicable engineering requirements.