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Compare ARS TMT bar weight for 8mm–32mm sizes, including kg/m, approximately 40 ft rod weight, pieces per bundle, bundle weight and bars per tonne.
ARS TMT bars are available in 8mm, 10mm, 12mm, 16mm, 20mm, 25mm and 32mm sizes. According to the approved ARS weight chart, the nominal weight ranges from 0.395 kg/m for an 8mm bar to 6.310 kg/m for a 32mm bar.
The chart below compares weight per metre, weight of one approximately 40 ft bar, pieces per ARS bundle, bundle weight and approximate bars per tonne. Actual measured weight may vary within the applicable permissible tolerance.
Quick ARS TMT Steel Bar Weight Chart
Compare the approved nominal values before estimating bars, bundles, transportation weight or tonnage.
Nominal ARS 40 ft bar and bundle values
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| TMT bar size | Nominal weight per metre | Nominal 40 ft bar weight | Pieces per ARS bundle | Nominal bundle weight | Approx. bars per tonne |
|---|---|---|---|---|---|
| 8mm | 0.395 kg/m | 4.819 kg | 10 | 48.190 kg | 208 |
| 10mm | 0.617 kg/m | 7.527 kg | 7 | 52.692 kg | 133 |
| 12mm | 0.888 kg/m | 10.834 kg | 5 | 54.168 kg | 92 |
| 16mm | 1.580 kg/m | 19.276 kg | 3 | 57.828 kg | 52 |
| 20mm | 2.470 kg/m | 30.134 kg | 2 | 60.268 kg | 33 |
| 25mm | 3.850 kg/m | 46.970 kg | 1 | 46.970 kg | 21 |
| 32mm | 6.310 kg/m | 76.982 kg | 1 | 76.982 kg | 13 |
The bars-per-tonne figures are approximate calculations based on nominal ARS bar weight. Actual quantities and delivery weights may vary within the applicable tolerance.
Calculate TMT quantityARS TMT Bar Weights by Size
Use the diameter-specific values below for material estimation and procurement planning. Structural selection must follow approved project drawings.
ARS nominal specification
8mm Steel Rod Weight
The nominal weight for a 8mm ARS TMT bar is 0.395 kg per metre. The nominal weight of one approximately 40 ft bar is 4.819 kg.
Read the ARS 8mm rod weight guideThe use of an 8mm bar in any structural element must follow drawings and specifications approved by a qualified structural engineer.
- Minimum weight per 40 ft bar
- 4.477 kg
- Nominal weight per 40 ft bar
- 4.819 kg
- Maximum weight per 40 ft bar
- 5.161 kg
- Pieces per ARS bundle
- 10
- Nominal bundle weight
- 48.190 kg
- Approximate 40 ft bars per tonne
- 208
ARS nominal specification
10mm Steel Rod Weight
The nominal weight for a 10mm ARS TMT bar is 0.617 kg per metre. The nominal weight of one approximately 40 ft bar is 7.527 kg.
Bar diameter and placement must follow the structural drawings for the project.
- Minimum weight per 40 ft bar
- 7.003 kg
- Nominal weight per 40 ft bar
- 7.527 kg
- Maximum weight per 40 ft bar
- 8.052 kg
- Pieces per ARS bundle
- 7
- Nominal bundle weight
- 52.692 kg
- Approximate 40 ft bars per tonne
- 133
ARS nominal specification
12mm Steel Rod Weight
The nominal weight for a 12mm ARS TMT bar is 0.888 kg per metre. The nominal weight of one approximately 40 ft bar is 10.834 kg.
Read the ARS 12mm rod weight guideThe suitability of a 12mm bar for a beam, slab, column or other structural element must be determined by a qualified structural engineer.
- Minimum weight per 40 ft bar
- 10.297 kg
- Nominal weight per 40 ft bar
- 10.834 kg
- Maximum weight per 40 ft bar
- 11.370 kg
- Pieces per ARS bundle
- 5
- Nominal bundle weight
- 54.168 kg
- Approximate 40 ft bars per tonne
- 92
ARS nominal specification
16mm Steel Rod Weight
The nominal weight for a 16mm ARS TMT bar is 1.580 kg per metre. The nominal weight of one approximately 40 ft bar is 19.276 kg.
A structural engineer must determine where 16mm reinforcement is required based on the design and expected loads.
- Minimum weight per 40 ft bar
- 18.312 kg
- Nominal weight per 40 ft bar
- 19.276 kg
- Maximum weight per 40 ft bar
- 20.240 kg
- Pieces per ARS bundle
- 3
- Nominal bundle weight
- 57.828 kg
- Approximate 40 ft bars per tonne
- 52
ARS nominal specification
20mm Steel Rod Weight
The nominal weight for a 20mm ARS TMT bar is 2.470 kg per metre. The nominal weight of one approximately 40 ft bar is 30.134 kg.
- Minimum weight per 40 ft bar
- 29.231 kg
- Nominal weight per 40 ft bar
- 30.134 kg
- Maximum weight per 40 ft bar
- 31.037 kg
- Pieces per ARS bundle
- 2
- Nominal bundle weight
- 60.268 kg
- Approximate 40 ft bars per tonne
- 33
ARS nominal specification
25mm Steel Rod Weight
The nominal weight for a 25mm ARS TMT bar is 3.850 kg per metre. The nominal weight of one approximately 40 ft bar is 46.970 kg.
- Minimum weight per 40 ft bar
- 45.555 kg
- Nominal weight per 40 ft bar
- 46.970 kg
- Maximum weight per 40 ft bar
- 48.373 kg
- Pieces per ARS bundle
- 1
- Nominal bundle weight
- 46.970 kg
- Approximate 40 ft bars per tonne
- 21
ARS nominal specification
32mm Steel Rod Weight
The nominal weight for a 32mm ARS TMT bar is 6.310 kg per metre. The nominal weight of one approximately 40 ft bar is 76.982 kg.
- Minimum weight per 40 ft bar
- 74.676 kg
- Nominal weight per 40 ft bar
- 76.982 kg
- Maximum weight per 40 ft bar
- 79.288 kg
- Pieces per ARS bundle
- 1
- Nominal bundle weight
- 76.982 kg
- Approximate 40 ft bars per tonne
- 13
The required diameter, quantity, spacing and placement of reinforcement must always follow the approved structural design.
How to Calculate TMT Steel Bar Weight
A commonly used formula for estimating TMT bar weight is:
Weight per metre
Approximate weight in kg/m = D2 ÷ 162
- D is the nominal diameter of the bar in millimetres.
- The result is the approximate weight in kilograms per metre.
- The formula provides an estimate and may differ slightly from approved nominal values because of rounding.
Complete bar
Bar weight = weight per metre × bar length in metres
Complete bundle
Bundle weight = weight of one bar × pieces per bundle
For ARS quantity and bundle calculations, use the approved ARS nominal values in the weight chart rather than relying only on the general formula.
Worked example
Calculating the Weight of a 16mm Bar
The approved nominal weight of a 16mm ARS TMT bar is 1.580 kg per metre.
1.580 × 12.2 = 19.276 kg
19.276 × 3 = 57.828 kg
Therefore, the nominal weight of one ARS 16mm bundle is 57.828 kg.
Nominal Weight and Permissible Weight Range
The nominal weight is the standard reference value used for planning and comparison. The actual measured weight of a TMT bar may be slightly lower or higher within the applicable permissible tolerance.
8mm and 10mm
Minimum and maximum values around the nominal weight
12mm and 16mm
A narrower permissible weight range
20mm, 25mm and 32mm
A further reduced weight range
The exact weight of a delivered bar or bundle should be checked against the applicable ARS specification and delivery documentation.
How Many TMT Bars Make One Tonne?
The approximate number of bars per tonne can be calculated using:
Approximate bars per tonne = 1,000 ÷ nominal weight of one bar
- 8mmapproximately 208 bars
- 10mmapproximately 133 bars
- 12mmapproximately 92 bars
- 16mmapproximately 52 bars
- 20mmapproximately 33 bars
- 25mmapproximately 21 bars
- 32mmapproximately 13 bars
These figures are theoretical estimates. Actual quantities can vary depending on measured bar weight and the applicable tolerance.
Difference Between TMT Bar Weight and Bundle Weight
Bar weight is the weight of one individual TMT bar. Bundle weight is the combined weight of all the bars packed in one ARS bundle.
For example, the nominal weight of one 10mm ARS bar is 7.527 kg. A 10mm ARS bundle contains seven bars:
7.527 × 7 = 52.692 kg
Therefore, the nominal weight of a 10mm ARS bundle is 52.692 kg.
The number of bars in a bundle differs according to bar diameter. Always use the approved ARS pieces-per-bundle value for the required diameter.
Frequently Asked Questions About TMT Bar Weight
Choose and Calculate ARS TMT Bars
Understanding TMT steel bar weight helps contractors, engineers and buyers estimate material quantities, transportation requirements and procurement costs. The ARS chart provides approved weight and bundle information for 8mm, 10mm, 12mm, 16mm, 20mm, 25mm and 32mm TMT bars.
Use the ARS TMT steel calculator to estimate rods, bundles, weight and indicative cost by diameter. You can also check today's ARS TMT steel price, explore ARS Fe 550D TMT bars, find an ARS dealer or request a quotation.
This weight chart is intended for material estimation and procurement planning. Construction reinforcement must follow drawings and specifications approved by a qualified structural engineer.
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