Steel Bar Weight Calculator
AvailableFind the theoretical weight of round steel bars from their diameter and length.
Use the calculator
The numbers below are examples. Replace them with yours. Everything is worked out in your browser.
About this calculator
Find the theoretical weight of round steel bars from their diameter and length. It helps with ordering and with checking a delivery against a bar schedule.
How it works
- Weight per metre is pi divided by 4, times the diameter in metres squared, times 7850 kg per cubic metre.
- The weight of a bar is the weight per metre times its length, and the total multiplies by the number of bars.
- Real bars differ a little because of ribs and tolerances.
This is a preliminary estimate for planning and shopping lists. It is not a structural design, a safety check or a building-code approval. Ask a qualified professional before you build.
Common questions
Is this the weight the supplier will charge?
Suppliers use their own weight charts and tolerances, so the invoice can differ slightly.
Does it work for other shapes?
No. It is for round bars only.
Estimates only. Check important numbers before you rely on them.
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