Density standard: 7,850 kg/m³
Total Weight (kg)
0.00 kg
Total Weight (lbs)
0.00 lbs
Metric Tons
0.000 MT
Calculate the precise theoretical weight of round bars, pipes, square tubes, steel plates, and beams using standard geometric density formulas.
Theoretical steel weight calculation relies on calculating volume (V) and multiplying by steel density (ρ = 7,850 kg/m³). Here are the standard formulas used in engineering specifications:
Formula per meter (using diameter D in mm):
Example: A 12 mm bar weighs 12² / 162.2 = 0.888 kg/m.
Formula using length, width (m), and thickness (mm):
Example: A 1m × 2m plate of 5mm thickness weighs 1 × 2 × 5 × 7.85 = 78.5 kg.
Using outer diameter (OD) and wall thickness (WT) in mm:
Calculates hollow pipe weight per linear meter.
Quick-reference unit weight chart for TMT rebar reinforcement bars (Density: 7,850 kg/m³).
| Bar Diameter (mm) | Formula (D²/162) | Weight per Meter (kg/m) | Standard 12m Rod Weight (kg) | Weight per Foot (lbs/ft) |
|---|---|---|---|---|
| 8 mm | 8² / 162 | 0.395 kg | 4.74 kg | 0.265 lbs |
| 10 mm | 10² / 162 | 0.617 kg | 7.40 kg | 0.414 lbs |
| 12 mm | 12² / 162 | 0.888 kg | 10.66 kg | 0.597 lbs |
| 16 mm | 16² / 162 | 1.578 kg | 18.94 kg | 1.060 lbs |
| 20 mm | 20² / 162 | 2.466 kg | 29.59 kg | 1.657 lbs |
| 25 mm | 25² / 162 | 3.853 kg | 46.24 kg | 2.589 lbs |
| 32 mm | 32² / 162 | 6.313 kg | 75.76 kg | 4.242 lbs |
Need offline calculations for I-beams, C-channels, and angles right at the job site? Download the official mobile application.
The general formula is: Weight = Volume × Density. For round rebar, use the quick thumb-rule: Weight (kg/m) = D² / 162, where D is the diameter in mm.
The standard density used for carbon and mild steel is 7,850 kg/m³ (0.2836 lb/in³). For stainless steel (SS304/SS316), density ranges between 7,930 kg/m³ and 8,000 kg/m³.
To calculate mild steel plate weight: Weight (kg) = Length (m) × Width (m) × Thickness (mm) × 7.85.