Steel Weight Calculators
Quick estimates for coil and sheet steel. Enter your dimensions and each answer updates as you type — click any grey box to copy the result.
Results are estimates based on 0.2833 lb/in³, the density of carbon steel. Actual weights vary with mill tolerances and coatings.
Coil Weight
Estimate a coil's weight from its outside diameter, inside diameter and width.
Weight = π/4 × (OD² − ID²) × width × 0.2833
Circle Weight
Weight of a round blank or disc. Add an ID to calculate a ring or washer.
Weight = 0.7854 × (diameter² − ID²) × thickness × 0.2833
Coil Weight to OD
Find the outside diameter a coil of a given weight will have, plus its pounds per inch of width (PIW).
OD = 2 × √(weight ÷ (0.2833 × width × π) + ID²/4)
Flat Sheet Weight
Weight of a single sheet or plate.
Weight = thickness × width × length × 0.2833
Coil Lineal Feet
How many feet of strip are on a coil of a given weight.
Feet = weight ÷ (thickness × width × 12 × 0.2833)
Coil Feet to Weight
Weight of a given length of strip.
Weight = feet × thickness × width × 12 × 0.2833
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