Steel Weight — Volume × Density
Weight = Cross-section × Length × Density. A36: 0.2836 lb/in³.
📋 Quick Examples — Click to Load
Planning estimates only. Verify with a licensed engineer or contractor before construction.
📐 Construction Industry Facts
A36: 0.2836 lb/in³
— AISC
Stainless ~0.289
— ASTM
Weight = Cross-section × Length × Density. A36: 0.2836 lb/in³. Round: πr². Tube: π(R²−r²). Angle: (A+B−t)×t.
Sources: AISC, ASTM.
Key Takeaways
- • Weight = Area × Length × Density
- • A36: 0.2836 lb/in³
- • Round: πr²; Tube: π(R²−r²)
- • Add 5–10% waste
Did You Know?
How Does Steel Weight Work?
Cross-Section
Round: πr². Square: side². Tube: π(R²−r²). Angle: (A+B−t)×t. Flat: W×T.
Volume & Weight
Volume = Area × Length. Weight = Volume × Density. Use consistent units (inches).
Grades
A36, carbon, galvanized: 0.2836. Stainless: 0.289. Price multiplier varies.
Expert Tips
Shape Formulas
| Shape | Area Formula |
|---|---|
| Round bar | π × (d/2)² |
| Square bar | side² |
| Round tube | π × (R² − r²) |
| Angle | (A + B − t) × t |
Frequently Asked Questions
How is steel weight calculated?
Weight = Cross-section area × Length × Density. Round bar: πr²×L. Tube: π(R²−r²)×L. A36 density: 0.2836 lb/in³.
What is the density of A36 steel?
A36 mild steel: 0.2836 lb/in³ (7.85 g/cm³). Stainless 304/316: ~0.289 lb/in³. Same formula, different density.
How do I calculate round bar weight?
Area = π × (diameter/2)². Volume = Area × length. Weight = Volume × 0.2836 (for A36). Use inches for lb/in³.
How do I calculate hollow tube weight?
Area = π × ((OD/2)² - (ID/2)²). ID = OD - 2×wall thickness. Then Volume = Area × length, Weight = Volume × density.
How do I calculate angle iron weight?
Cross-section = (Leg A + Leg B - thickness) × thickness. Weight = Area × length × density. Standard formula for L-shape.
What steel grades are available?
A36 mild, carbon 1018, alloy 4140, stainless 304/316, galvanized. All carbon steels ~0.2836 lb/in³. Stainless ~0.289.
Key Statistics
Official Data Sources
⚠️ Disclaimer: Estimates only. Verify with supplier. Not for structural design. Add waste for fabrication.
Related Calculators
Metal Weight Calculator - Bar, Tube, Angle & Beam Estimator
Calculate metal weight for various shapes including round bars, square tubes, angles, channels, and I-beams. Supports steel, aluminum, copper, brass, and...
ConstructionPlate Weight Calculator - Metal Sheet & Plate Estimator
Calculate metal plate weight by dimensions, thickness, and material type. Supports steel, aluminum, copper, brass plates in rectangle, circle, triangle, and...
ConstructionSteel Plate Weight Calculator - Flat Bar & Sheet Metal
Calculate steel plate weight by dimensions and thickness. Supports various steel grades including carbon steel, stainless steel, and alloy steel with cost...
ConstructionAir Changes Per Hour Calculator - Ventilation & HVAC Design
Calculate air changes per hour for proper ventilation and HVAC design. Determine if your room meets recommended ACH standards for different room types...
ConstructionAir Conditioner BTU Calculator - AC Sizing & Capacity
Calculate the required BTU capacity for air conditioning based on room size, sun exposure, insulation quality, climate zone, occupants, and appliances. Get...
ConstructionAluminum Weight Calculator - Alloy Weight & Cost Estimation
Calculate the weight of aluminum materials based on dimensions, shape, and alloy type. Supports sheets, bars, tubes, angles, channels, and I-beams with cost...
Construction