Calculator Inputs
Formula Used
This calculator converts all entered dimensions to meters, computes cross-sectional area, then multiplies by length to find volume. Weight is then found from density.
- General formula: Weight = Density × Volume
- Plate: Volume = Thickness × Width × Length
- Round bar: Area = π × Diameter² ÷ 4, then Volume = Area × Length
- Square bar: Area = Side², then Volume = Area × Length
- Flat bar: Area = Width × Thickness, then Volume = Area × Length
- Pipe: Area = π ÷ 4 × (OD² − ID²), where ID = OD − 2t
- Rectangular tube: Area = W × H − (W − 2t) × (H − 2t)
- Angle: Area ≈ t × (A + B − t)
- Channel: Area ≈ tw × (D − 2tf) + 2 × B × tf
- Gross total: Gross Weight = Net Weight × (1 + Wastage% ÷ 100)
- Cost: Estimated Cost = Gross Weight × Rate per kg
How to Use This Calculator
- Select the mild steel section type that matches your material.
- Choose a single input unit for every dimension in the form.
- Enter density. For general mild steel, 7850 kg/m³ is common.
- Fill the shape dimensions and member length carefully.
- Enter quantity, wastage percentage, and optional rate per kilogram.
- Click Calculate Weight to show results above the form.
- Review weight per piece, weight per meter, total weight, volume, and cost.
- Use the CSV and PDF buttons to save the calculated output.
Example Data Table
| Section | Dimensions | Length | Density (kg/m³) | Approx. Weight per Piece (kg) |
|---|---|---|---|---|
| Plate | 10 × 1000 mm | 2000 mm | 7850 | 157.00 |
| Round Bar | 25 mm diameter | 6000 mm | 7850 | 23.12 |
| Flat Bar | 50 × 6 mm | 6000 mm | 7850 | 14.13 |
| Square Bar | 20 × 20 mm | 3000 mm | 7850 | 9.42 |
| Rectangular Tube | 50 × 30 × 2.5 mm | 6000 mm | 7850 | 17.66 |
FAQs
1) What density should I use for mild steel?
A common design value is 7850 kg/m³. Some suppliers use slightly different values due to composition, finish, or standard tolerances. Use your mill certificate when precision matters.
2) Are angle and channel weights exact?
They are close estimating values. Rolled sections often include corner radii and tolerances, so handbook or manufacturer tables may show slightly different weights.
3) Can I enter dimensions in inches or feet?
Yes. Choose the correct unit first, then enter every dimension using that same unit. The calculator converts everything to meters internally before calculating weight.
4) What is the difference between net and gross total weight?
Net total is the direct calculated mass for the entered quantity. Gross total adds your wastage percentage for cutting loss, trimming, scrap, or ordering allowance.
5) Why is rate per kilogram optional?
Some users only need mass for handling, transport, or procurement. Rate per kilogram is optional so you can also estimate material cost when price data is available.
6) Does this calculator support hollow sections?
Yes. Use the pipe option for circular hollow members and the rectangular tube option for RHS-style sections. Both subtract the hollow core before computing weight.
7) Why is weight per meter important on site?
Weight per meter helps with quick checks during fabrication, transport planning, lifting selection, and verifying supplier data without recalculating every full piece length.
8) When should I confirm results with supplier tables?
Confirm with supplier or code tables for final purchasing, structural design, rolled standard sections, or projects needing certified weights, tolerances, and section properties.