TMT Bar Weight Calculator
Calculate TMT / rebar weight per metre, per bar and for any quantity.
Visual breakdown
Detailed breakdown
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What is the TMT Bar Weight Calculator?
TMT (thermo-mechanically treated) bars are sold by weight but ordered by length. The standard formula D²/162 gives weight per metre from the diameter in millimetres.
How to use this calculator
- Enter your values in the input fields. Use the sliders where available for quick changes.
- Choose the options that fit your case - currency, number format and decimals can be changed in the Options bar.
- The result updates instantly as you type. Press Calculate to refresh.
- Review the summary, the chart and the detailed table (when shown).
- Use Export & share to download a snapshot image (PNG or JPG), copy the result, print, save a CSV, or copy a link that reopens your inputs.
Formula and method
Weight = weight per metre x length x number of bars
Worked example
Loading example...
Options you get
- Currency symbol and Indian or international digit grouping
- Decimal places control
- Instant results with charts and tables (where relevant)
- Snapshot image export (PNG / JPG), copy image, CSV, print and share link
- Light and dark themes - works on mobile, tablet and desktop
Frequently asked questions
Why 162?
From steel density 7850 kg/m³: pi/4 x D² x 7850 / 10^6 = D²/162.27.
Standard bar length?
Usually 12 metres.
Is this calculator free to use?
Yes. All MCSBiz calculators are free, work in your browser and need no sign-up.
Is my data stored or sent to a server?
No. Calculations run on your own device. Your inputs are not uploaded, and nothing is saved unless you choose to share a link or export an image.
Can I save or share my result?
Yes. Use "Download PNG" or "Download JPG" to export a snapshot image, copy the result, print it, download a CSV, or copy a link that reopens the calculator with your inputs.
Important note
Quantities are estimates. Actual requirements depend on site conditions, workmanship and wastage. Always add a safety margin and confirm with your engineer or contractor.