Understand what a weight chart represents
A bar weight chart connects nominal diameter with a reference mass per metre. It can help buyers prepare an enquiry and check whether a quoted quantity has been expressed consistently. It is not a record of the actual weight of a delivered bundle.
The reference table below uses sectional mass values published in RINL retailer operating guidelines. The source is historical and is used here for the mass reference only. It does not confirm current grades, available diameters, lengths, prices or commercial terms.
Keep diameter, length and pieces separate
Choose the nominal diameter, then multiply the reference mass per metre by the supplied length and the number of pieces. For example, the table gives 0.888 kg per metre for a 12 mm bar. At a stated length of 12 metres, one nominal length is approximately 10.66 kg.
A different length changes the estimated mass of each piece. Do not use a per-piece figure without checking the length on which it is based. When several diameters are required, calculate each line separately before combining the estimated total.
Nominal TMT bar mass reference
| Diameter (mm) | Reference mass (kg/m) | At 12 m length (kg) |
|---|---|---|
| 8 | 0.395 | 4.74 |
| 10 | 0.617 | 7.40 |
| 12 | 0.888 | 10.66 |
| 16 | 1.580 | 18.96 |
| 20 | 2.470 | 29.64 |
| 25 | 3.851 | 46.21 |
| 28 | 4.830 | 57.96 |
| 32 | 6.310 | 75.72 |
Nominal mass values: RINL retailer guidelines, section 6.2(A), historical reference. The 12 m column is calculated as mass per metre × 12. It does not confirm a currently available supply length.
Use the calculator as an enquiry aid
The calculator applies the published reference mass to the length and piece count entered. Its result is an estimate. Rounding, product tolerances, packaging and the agreed measurement process can affect the actual transaction.
To convert an estimated kilogram figure to metric tonnes, divide by 1,000. If a quotation uses metric tonnes and another uses kilograms or individual lengths, make the conversion explicit before comparing the two offers.
Confirm how the final quantity will be established
Ask whether the quotation and invoice use theoretical mass, measured weight or another explicitly agreed basis. Review the relevant product specification and the receiving process rather than treating a web calculator as a test of conformity.
Send the required diameters and lengths with a delivery location when requesting a current quotation. The product specification, actual offer and associated documents remain the basis of the purchase.
Your enquiry checklist
- Check the reference unit: kg per metre
- Enter the actual required supplied length
- Calculate each diameter separately
- Confirm the agreed invoice and measurement basis
Explore the relevant products
Source references
Published 05 Nov 2026. Technical specifications and commercial availability should be checked against current product documents and the actual written offer.
