Steel Coil Weight Calculator
Calculate coil weight and PIW from dimensional measurements
How It Works
Uses the standard steel density constant of 0.2833 lb/in³.
Formula: Weight = π × ((OD/2)² − (ID/2)²) × Width × 0.2833
PIW: PIW = Weight ÷ Width
Results are rounded to the nearest whole number. Actual weights may vary by steel grade, coating, and tolerances.
Pricing & NPW Calculator
Calculate net package weight and convert between pricing units
NPW Formula
NPW = (Width × Length × Base Weight × 112) / 31,360
A base box = 112 sheets of 14″ × 20″ (31,360 sq in). Sheet weight = NPW / 112.
Thickness Conversion
Convert between base weight, decimal thickness, and metric
Reference Table
| BW (lbs) | Inches | mm |
|---|
Temper Designations
Hardness ranges and typical end uses
The term temper, when applied to single-reduced tin mill products, summarizes a combination of interrelated mechanical properties. The Rockwell 30TS hardness value serves as a guide to the properties of the plate.
Key Differences
Box Annealed: Batch process, more uniform mechanical properties.
Continuously Annealed: In-line process, includes T-5 temper for higher stiffness.
Double-Reduced: Second cold reduction after annealing for increased strength; characterized by UTS rather than just hardness.
Tin Coating Weights
Symmetrical and differential coating designations
| Designation | lbs/Base Box | g/m² | Type |
|---|
Differential Coating Markings
For differentially coated tin plate, the heavier coated side must be identified:
Decimal Equivalents
Fraction, decimal (inches), and millimeter conversions
Common Fractions Reference
| Fraction | Decimal (inches) | Millimeters |
|---|
Unit Converter
Common conversions for the steel and tinplate industry
Quick Reference — All Conversion Factors
Reynolds Services, Inc.
Notifications
Submit Feedback
RSI Tools
Version 1.4.0
Steel and tinplate industry calculators built by Reynolds Services, Inc. for customers, partners, and industry professionals.
Includes coil weight estimation, pricing and NPW conversions, thickness reference data, temper designations, tin coating weights, decimal equivalents, and unit converters.
This app works offline once installed and is available for phones, tablets, and desktops.
Tip: tap the bell icon in the header to receive updates from Reynolds Services — pricing changes, new tools, and industry news.
© 2026 Reynolds Services, Inc.
STEEL: THE FOREVER RESOURCE™