Steel Bar Weight Calculator (Round/Flat/Square) | Free Online Tool for Engineers
Calculate weights for round, flat & square steel bars instantly. Get accurate weight per meter and total weight in kg or lbs. Essential tool for engineers and metalworkers.
Our Steel Bar Weight Calculator provides instant weight calculations for three common steel bar types: round, flat, and square. This professional tool helps engineers, fabricators, and construction professionals quickly determine material weights for structural design, logistics, and cost estimation.
Key Features
✅ Three-in-One Calculator for round, flat, and square steel bars
✅ Dual Unit Support - metric (mm/kg) and imperial (in/lbs)
✅ Weight per Meter and Total Weight calculations
✅ Quantity Multiplier for batch calculations
✅ Mobile-Optimized responsive design
✅ No Installation - works directly in your browser
How to Use
- Select Bar Type: Choose between round, flat, or square bars
- Enter Dimensions:
- Round: Diameter
- Flat: Width & Thickness
- Square: Side Length
- Input Length: Specify bar length in meters/feet
- Set Quantity: Default is 1 (adjust for multiple bars)
- Calculate: Instantly get weight per meter and total weight
Calculation Principle
All calculations use steel density of 7850 kg/m³ (0.284 lb/in³) with these formulas:
Round Bars:
Weight = (Diameter² × Length × Density × Conversion Factor)
- Metric: 0.006165 × D² (mm) × L (m)
- Imperial: 0.2844 × D² (in) × L (ft)
Flat Bars:
Weight = (Width × Thickness × Length × Density × Conversion Factor)
- Metric: 0.00785 × W (mm) × T (mm) × L (m)
- Imperial: (W × T × 3.403 × L) / 12 (in/ft)
Square Bars:
Weight = (Side² × Length × Density × Conversion Factor)
- Metric: Side² (mm→m) × L (m) × 7850
- Imperial: Side (in→m)² × L (ft→m) × 7850 × 2.20462
FAQ
Q: What steel density does the calculator use?
A: Standard carbon steel density (7850 kg/m³). For stainless steel, multiply results by 1.015.
Q: Can I calculate weights for partial lengths?
A: Yes! Enter any decimal length value (e.g., 2.5m or 3.75ft).
Q: Are the results accurate for other metals?
A: Results are steel-specific. For aluminum (2700 kg/m³), multiply by 0.344.
Q: Why don't you include hexagonal bars?
A: This tool focuses on the three most common shapes. Contact us for custom shapes.
Q: How do I calculate weight for multiple different bars?
A: Calculate each separately and sum the totals.
Q: Is this tool free for commercial use?
A: Yes, 100% free with no limits on calculations.
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