Iron Round Bar Weight Calculator
Enter diameter, length, and iron type to instantly calculate the weight of an iron round bar in kg and lbs.
Bar Dimensions
Formula Reference
W = (π / 4) × D² × L × ρ
Where D = diameter (m), L = length (m), ρ = density (kg/m³), W = weight (kg).
Enter dimensions on the left and click Calculate.
Weight Result
—
Kilograms (kg)
—
Pounds (lb)
Iron Type Densities
| Iron Type | kg/m³ | lb/in³ |
|---|---|---|
| Cast Iron (general) | 7200 | 0.260 |
| Gray Cast Iron | 7100 | 0.257 |
| Ductile Cast Iron | 7300 | 0.264 |
| Wrought Iron | 7750 | 0.280 |
| Carbon Steel (ref.) | 7850 | 0.284 |
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Summary
Enter diameter, length, and iron type to instantly calculate the weight of an iron round bar in kg and lbs.
How it works
- Enter the bar diameter in millimeters, centimeters, or inches.
- Enter the bar length in meters, millimeters, feet, or inches.
- Select the iron type — cast iron or wrought iron.
- Optionally enter the quantity of bars for a total weight.
- Click Calculate Weight to apply the formula W = (π/4) × D² × L × ρ.
- Copy the result with the Copy button for use in reports or spreadsheets.
Use cases
- Estimating iron bar weight for structural and mechanical engineering projects.
- Calculating freight and shipping weight for iron stock orders.
- Preparing bill-of-materials (BOM) for manufacturing and fabrication.
- Comparing cast iron vs. wrought iron for weight-sensitive designs.
- Checking load limits on hoists and lifting equipment.
- Budgeting material costs when iron is priced by weight.
Frequently Asked Questions
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Last updated: 2026-05-23 ·
Reviewed by Nham Vu