What is the Rod Weight Calculator?
Calculate the weight of steel reinforcement bars (rod) from diameter and length.
Enter bar diameter, length of one bar, number of bars and price per kg and the Rod Weight Calculator returns total weight, weight per metre, weight per foot and estimated cost. Results update as you type, and nothing you enter leaves your device.
How it is calculated
How to use it
- Enter bar diameter in mm.
- Enter length of one bar in m.
- Enter number of bars in bars.
- Enter price per kg.
- Read total weight in the results panel. It updates as you type.
- Change any value to compare scenarios, or use Share to send the result as a link.
Worked example
Common questions
Where does D² ÷ 162.2 come from?
A round steel bar one metre long has a volume of π × D² ÷ 4. Multiplying by the density of steel (7,850 kg/m³) and converting millimetres to metres gives D² ÷ 162.2 kilograms per metre.
What formula does the Rod Weight Calculator use?
It uses: Weight (kg per metre) = D² ÷ 162.2, with D in millimetres.
What do I need to use the Rod Weight Calculator?
You need bar diameter, length of one bar, number of bars and price per kg. Sensible starting values are filled in so you can see how it works straight away.
Is the Rod Weight Calculator free, and is my data stored?
It is free with no sign-up. The calculation runs in your browser, so the values you enter are not sent to or stored on our server.