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Steel Weight Calculator
Calculates the weight of steel bar, square section or flat plate from its dimensions, with the per-metre figure and the d²/162 site rule.
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In short
Steel Weight Calculator is a free online tool on inputtesthub.com that calculates the weight of steel bar, square section or flat plate from its dimensions, with the per-metre figure and the d²/162 site rule. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.
How to use the Steel Weight Calculator
- Enter your figures in the input fields.
- The result updates as you type, together with the full working.
- Check the breakdown table to see exactly how the number was reached.
About the Steel Weight Calculator
The Steel Weight Calculator calculates the weight of steel bar, square section or flat plate from its dimensions, with the per-metre figure and the d²/162 site rule. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Ordering rebar by weight when it is sold by the tonne.
- Checking a steel supplier’s invoice against what was delivered.
- Working out a lifting weight before moving a bundle.
Details
| Carbon steel density | 7,850 kg/m³ |
|---|---|
| Site rule, round bar | d² ÷ 162 kg/m |
| 12 mm rebar | ≈ 0.888 kg/m |
| 16 mm rebar | ≈ 1.58 kg/m |
| Stainless | ≈ 7,900 kg/m³ |
The maths behind it
This tool uses Weight per metre = cross-sectional area × 7,850 kg/m³. For round bar this reduces to the familiar d² ÷ 162 kg/m used on site. Every intermediate value is shown on screen, so the result can be checked by hand.
The d²/162 shortcut is the same calculation with the constants folded in — it agrees with the exact figure to a fraction of a percent. Do not use these numbers for aluminium, which is roughly a third the weight.
Frequently asked questions
What is the d²/162 formula?
It is the weight in kilograms per metre of a round steel bar, where d is the diameter in millimetres. It comes from the area of a circle multiplied by steel’s density — the 162 is just those constants combined, so it is exact rather than an approximation.
How much does a 12 m length of 12 mm rebar weigh?
About 10.7 kg — 0.888 kg per metre. The calculator shows the per-metre figure and the total for however many pieces you enter.
Is the Steel Weight Calculator free, or is there a paid tier?
Free, unlimited, and no email address required. You can use it a hundred times a day and nothing changes.
Does anything I enter leave my computer?
No. The Steel Weight Calculator runs entirely in your browser using JavaScript. Because the work happens locally, the page also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
How is the result calculated?
It uses Weight per metre = cross-sectional area × 7,850 kg/m³. For round bar this reduces to the familiar d² ÷ 162 kg/m used on site. The full working is printed under the result, so you can follow every step rather than trusting a black box.
Who is the Steel Weight Calculator for?
The jobs it is built for: ordering rebar by weight when it is sold by the tonne. Checking a steel supplier’s invoice against what was delivered. Working out a lifting weight before moving a bundle. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is there anything to watch out for?
The d²/162 shortcut is the same calculation with the constants folded in — it agrees with the exact figure to a fraction of a percent. Do not use these numbers for aluminium, which is roughly a third the weight.
Which values should I know?
Carbon steel density is 7,850 kg/m³. Site rule, round bar is d² ÷ 162 kg/m. 12 mm rebar is ≈ 0.888 kg/m. These are printed on the page itself, so you do not have to take them on trust.
Is the number rounded?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.
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