Tri-Ply Circles
Tri-Ply Circle Weight Formula: Calculate Any Size in Seconds
Circles are bought by weight but used by piece. This formula bridges the two - so you order exactly what you need.
The formula
Weight (kg) = π × (D/2)² × t × ρ ÷ 1,000,000
- D = diameter in mm, t = thickness in mm
- ρ (density) ≈ 7,700 kg/m³ for tri-ply (between steel 7,900 and aluminium 2,700, weighted by layer split)
Example: 400 mm × 2.0 mm → ≈ 1.94 kg per circle.
Why it matters
- Quoting: convert your piece requirement to kg for RFQs
- Verification: weigh incoming lots - short weight means thin gauge or short count
- Costing: per-piece cost = (₹/kg × weight) + pressing cost
Try it live
Our circle price calculator runs this formula with your ₹/kg rate built in.
Frequently asked questions
What is the density of tri-ply?
Approximately 7,700 kg/m³ - a weighted average of the steel and aluminium layers.
How do I convert kg to pieces?
Pieces = total kg ÷ weight per circle. Calculate per-circle weight with the formula above.
Have a cookware project in mind?
We manufacture triply cookware and supply tri-ply circles for OEM, private label and distribution. Tell us your specs - we reply with a quote.