Steel Weight & Cost Calculator
/Theoretical carbon-steel estimateFill in the dimensions on the left
Results update in real-time as you type
How this steel weight calculator works
Use this calculator for theoretical carbon-steel estimates of plate, sheet, round, square, flat and hex bar, pipe, square/rectangular tube, and selected ISMC channel sizes. Geometric profiles are normalized to metres and calculated as mass = volume × density, using 7,850 kg/m³ by default.
Material Sections
- MS Plate: Width × Length × Thickness
- Round Bar: π × Radius² × Length
- Pipe / Round Tube: Outer volume minus inner cavity.
- SHS (Square Hollow): Outer volume minus inner volume.
- MS Channel (ISMC): Selected nominal kg/m values from the calculator’s standard-size lookup.
Common Steel Terms
Density: The mass of a material per unit volume. Steel is typically 7.85 g/cm³.
ISMC: Indian Standard Medium Weight Channel, used in structural steel frameworks.
Tolerance: The permissible limit of variation in physical dimensions.
Theoretical, not certified, weight
Results use nominal dimensions. Actual supplied weight can vary because of mill tolerances, hollow-section corner radii, coatings, welds and the approved material grade. Use the mill certificate or supplier’s published mass for purchasing, certification and safety-critical work. Cost is simply theoretical total kg × the entered INR/kg rate; it excludes waste, freight, tax and currency conversion.
Formula reference
| Profile | Theoretical basis |
|---|---|
| Plate / sheet / flat | width × length × thickness × density |
| Round bar | π × diameter² / 4 × length × density |
| Pipe / tube | π × wall × (outside diameter − wall) × length × density |
| Square / rectangular tube | Outside area − inside area, then × length × density |
| ISMC channel | Selected nominal kg/m lookup × length |
Frequently Asked Questions
What is the density of mild steel?
Mild steel density is commonly calculated at 7850 kilograms per cubic meter (kg/m³) for engineering estimations.
How do I calculate weight from mm to kg?
Convert all dimensions to meters, calculate the volume in cubic meters, then multiply by the density (7850 kg/m³).