Calculate the exact weight of Circular Plates and Steel Discs instantly with our free online calculator. Simply enter your diameter and thickness in mm or inches, and get accurate results in both kg and lbs.
Weight Calculation for Circular Plate
The weight of a Circular Plate (also known as a Disc or Round Bar Slice) is determined by its volume and material density. Unlike square or rectangular plates, the area is calculated using the radius derived from the diameter. The standard density for mild steel is 7.85 g/cm³. Accurate weight calculation is essential for machining stock estimation, flange manufacturing, and material procurement.
Circular Plate Weight Formula and Manual Calculation
The industry-standard formula for calculating circular plate weight is:
Weight (kg) = π × (Diameter/2)² × Thickness (mm) × 0.00000785
Simplified for direct diameter input:
Weight (kg) = Diameter² (mm) × Thickness (mm) × 0.000006165
For imperial units (inches and lbs):
Weight (lbs) = Diameter² (in) × Thickness (in) × 0.222
Where 0.000006165 is the combined constant for pi and steel density when using mm, and 0.222 is the constant for inches.
Step-by-Step Calculation Example
- Step 1: Identify dimensions: Diameter = 500 mm, Thickness = 20 mm
- Step 2: Calculate Area: π × (250)² = 3.1416 × 62,500 = 196,350 mm²
- Step 3: Apply formula: 196,350 × 20 × 0.00000785 = 30.83 kg
- Step 4: Convert to lbs (optional): 30.83 × 2.20462 ≈ 67.97 lbs
This calculation aligns with the results provided by the circular plate weight calculator.
Circular Steel Plate Weight Chart (Quick Reference)
Frequently Asked Questions
How do I calculate the weight of a circular steel plate?
To calculate the weight of a circular steel plate, use the formula: Weight = π × (Radius)² × Thickness × Density. For mild steel in mm, you can simplify this to: Diameter² × Thickness × 0.000006165 to get the weight in kg.
What is the difference between a disc and a circular plate?
There is no significant difference in weight calculation between a disc and a circular plate; they are geometrically identical. The term "disc" is often used for smaller, machined components or brake rotors, while "circular plate" is used for larger structural or fabrication elements.
What is the weight of a 500mm diameter circular plate?
The weight of a 500mm diameter circular plate depends on its thickness. For example, a 500mm diameter plate with a 20mm thickness weighs approximately 30.83 kg. If the thickness is 10mm, it would weigh half that, around 15.42 kg.