Peso por metro de vergalhão
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The steel bar weight calculator determines the mass of steel bars per meter length. It uses the standard steel density (ρ_steel = 7850 kg/m³) and the diameter input provided. The calculation follows: weight = π × (diameter/2)² × 1 m × density. This tool is vital for construction projects needing precise material estimation.
To operate, input the bar diameter in millimeters. The calculator converts to meters, calculates the cross-sectional area (circle), and multiplies by density. Results in kg/m help with bulk purchasing or transportation. A common mistake is confusing diameter with radius; the formula automatically adjusts for this.
It's widely used in metal structure budgets, reinforced concrete foundations, and high-rise buildings. Accurate mass calculations prevent material waste and ensure structural safety. Always verify units and confirm the input diameter matches the actual bar available in the market.
Common precautions include checking the correct density (7850 kg/m³ is standard for carbon steel, stainless steel varies). Measure diameters with a ruler or caliper, as industrial bars may have manufacturing tolerances. The tool calculates straight bars only; curves or welds require additional manual adjustments.
Frequently asked questions
What formula does the calculator use?
It uses the cylinder volume formula (πr²h) multiplied by steel density (7850 kg/m³). The input diameter is automatically converted to radius.
Can I use it for stainless steel?
No, stainless steel density varies between 7900-8000 kg/m³. Use carbon steel calculator or manually adjust density if possible.
How to measure diameter correctly?
Use a caliper or ruler in millimeters. Measure perpendicular to the bar's axis to avoid skewed readings.
Why is the result in kg/m?
The calculator assumes 1-meter length for easier bulk purchasing or transportation per meter.
Do I need unit conversions?
The tool accepts millimeters. If using inches, convert to millimeters first before calculation.