Calculating TMT steel bar weight helps builders, civil engineers, contractors and homeowners estimate the steel required for construction projects. A TMT steel bar weight calculator simplifies this process by using the bar’s diameter and length to estimate its weight. Combined with weight charts, it helps users calculate the total weight of multiple bars, plan material purchases and estimate costs. Kairali TMT provides weight references to support more informed decisions when selecting steel for construction.
TMT Steel Bar Weight Chart
A TMT steel bar weight chart helps estimate the weight of reinforcement bars based on their diameter. It provides a quick reference for calculating material requirements, comparing bar sizes and planning steel purchases without performing each calculation individually.
The theoretical weight is calculated using the bar’s nominal diameter and length. However, the actual weight of supplied bars may differ within the applicable manufacturing tolerances. Therefore, chart values should be treated as estimates rather than exact measurements of every bar.
The following tables present reference weights per metre alongside Kairali TMT’s published weight ranges. These figures help users estimate the weight of different bar sizes and understand how the values compare. For accurate procurement planning, confirm the applicable specifications and actual supplied quantities with the manufacturer or supplier.
Kairali TMT Bar Weight per Metre
The following chart compares reference weight values with Kairali TMT’s published weight ranges for different bar diameters. These figures help estimate steel requirements for construction and material planning.
| Bar diameter (mm) | Reference minimum (kg/m) | Reference average (kg/m) | Reference maximum (kg/m) | Kairali TMT published range (kg/m) |
| 8 | 0.367 | 0.395 | 0.423 | 0.375–0.400 |
| 10 | 0.574 | 0.617 | 0.660 | 0.580–0.620 |
| 12 | 0.844 | 0.888 | 0.932 | 0.850–0.910 |
| 16 | 1.501 | 1.580 | 1.659 | 1.510–1.600 |
| 20 | 2.396 | 2.470 | 2.544 | 2.400–2.510 |
| 25 | 3.734 | 3.856 | 3.964 | 3.750–3.910 |
| 28 | 4.685 | 4.830 | 4.975 | 4.700–4.900 |
| 32 | 6.121 | 6.310 | 6.499 | 6.184–6.436 |
Disclaimer: The weights shown are reference values for estimation purposes. Actual TMT bar weights may vary within applicable manufacturing tolerances. For procurement, refer to the manufacturer’s specifications and verify the supplied weight.
TMT Bar Weight per 12-Metre Rod
TMT steel bars are commonly supplied in 12-metre lengths, making this a useful measurement for estimating individual rod weight. The table below shows the approximate weight of each bar size, calculated using nominal reference weights per metre.
| Bar diameter (mm) | Approximate weight per 12 m (kg) |
|---|---|
| 8 | 4.74 |
| 10 | 7.40 |
| 12 | 10.66 |
| 16 | 18.96 |
| 20 | 29.64 |
| 25 | 46.20 |
| 28 | 57.96 |
| 32 | 75.72 |
These figures are estimates rounded to two decimal places. Actual weight may vary depending on manufacturing tolerances and supplied bar length.
For product information, refer to Kairali TMT steel bars.
TMT Steel Bar Weight per Bundle
The weight of a TMT steel bar bundle depends on the bar diameter, number of rods and length of each rod. The following table presents Kairali TMT‘s published bundle quantities and approximate weights for different bar sizes. These figures align with the lower end of the published weight-per-metre ranges and should be used for estimation rather than treated as standard bundle weights.
| Bar diameter (mm) | Number of bars | Approximate bundle weight (kg) |
| 8 | 10 | 45.00 |
| 10 | 7 | 48.72 |
| 12 | 5 | 51.00 |
| 16 | 3 | 54.36 |
| 20 | 2 | 57.60 |
| 25 | 1 | 45.00 |
| 28 | 1 | 56.40 |
| 32 | 1 | 74.21 |
Bundle configurations and actual weights may vary. Confirm the supplied quantity and weight with the supplier when planning purchases or deliver
How to Calculate TMT Steel Bar Weight
Calculating TMT steel bar weight requires the bar’s diameter and length. A simple formula helps estimate the weight of an individual rod or the total weight of multiple rods, making it easier to plan material requirements for construction projects.
TMT Bar Weight Formula
The formula for estimating TMT steel bar weight is:
Weight (kg)=D2×L162\text{Weight (kg)}=\frac{D^2\times L}{162}Weight (kg)=162D2×L
Where:
- D = bar diameter in millimetres (mm).
- L = bar length in metres (m).
- Weight = estimated weight of one bar in kilograms (kg).
This formula provides an estimate based on the bar’s nominal dimensions.
Example of Calculating TMT Bar Weight
Suppose you need to calculate the weight of a 12 mm TMT bar measuring 12 metres long.
Using the formula:
122×12162=10.67 kg\frac{12^2\times12}{162}=10.67\text{ kg}162122×12=10.67 kg
Therefore, one bar weighs approximately 10.67 kg.
For 10 bars of the same diameter and length:
10.67×10=106.7 kg10.67\times10=106.7\text{ kg}10.67×10=106.7 kg
The estimated total weight is 106.7 kg. Actual supplied weights may vary within applicable manufacturing tolerances.
TMT Steel Bar Weight Conversion Calculator
The TMT steel bar weight conversion calculator helps estimate steel quantities across different bar diameters. Users can enter the required quantity in kilograms, individual rods or bundles for the available bar sizes. The calculator then displays the corresponding quantities and totals, helping with material estimation and purchase planning. Check the calculated results against the supplier’s specifications before placing an order.
Why Accurate TMT Bar Weight Matters in Construction
Accurate TMT bar weight estimates help builders, contractors and engineers plan construction materials more effectively. Knowing the expected steel quantity supports procurement planning, delivery scheduling and approximate cost calculations when steel is priced by weight. It also helps site teams track inventory, compare delivered quantities with purchase records and reduce the risk of overordering or material shortages. However, weight calculations alone do not determine structural requirements. Final steel quantities and bar specifications must follow approved construction drawings and relevant engineering specifications. Actual delivered weights should also be checked against supplier documentation and applicable manufacturing tolerances.
Frequently Asked Questions
What is the formula for calculating TMT steel bar weight?
The formula is Weight (kg) = D² × L ÷ 162, where D is the bar diameter in millimetres and L is its length in metres. The result estimates the weight of one bar in kilograms.
How much does a 12 mm TMT bar weigh?
A 12 mm TMT bar weighs approximately 0.888 kg per metre. For a standard 12-metre length, its estimated weight is 10.66 kg, based on the nominal reference weight.
How do you calculate TMT bar weight per metre?
Square the bar diameter in millimetres and divide the result by 162. For example, an 8 mm TMT bar weighs approximately 0.395 kg per metre using this formula.
What is the weight of a 12-metre TMT steel bar?
The weight depends on the bar’s diameter. For example, a 12-metre, 16 mm TMT bar weighs approximately 18.96 kg. Refer to the 12-metre rod weight chart above for other sizes.
How do you calculate the total weight of multiple TMT bars?
Multiply the estimated weight of one bar by the number of bars of the same diameter and length. For bars of different sizes, calculate each group’s weight separately and add the results.
How many TMT bars are there in a bundle?
The number varies depending on the bar diameter, supplier and packaging arrangement. Refer to Kairali TMT’s bundle chart above and confirm the current bundle configuration with the supplier before ordering.
What units are used to measure TMT bar weight?
TMT bar weight is commonly measured in kilograms (kg), while larger quantities are expressed in tonnes or quintals. One metric tonne equals 1,000 kg, and one quintal equals 100 kg.