Calculate the weight of reinforcement (TMT) steel bars instantly by entering the bar diameter, length, and quantity. Get accurate results in kilograms (kg) and metric tonnes (MT) for estimation, BOQ preparation, material planning, and construction projects. Ideal for civil engineers, contractors, quantity surveyors, and students.
Steel Weight Calculator
Unit Weight
-Weight / Bar
-Total Weight
-Total Length
-Total Weight (Ton)
-Estimated Cost
-Steel Weight Calculator – Formula, Steel Weight Chart, Examples & IS Code Reference
The Steel Weight Calculator helps civil engineers, quantity surveyors, contractors, architects, and students calculate the weight of reinforcement (TMT) steel bars quickly and accurately. By entering the bar diameter, length, and quantity, you can instantly determine the steel weight in kilograms (kg) or metric tonnes (MT), making estimation and material planning much easier.
What is Steel Weight?
Steel weight refers to the total mass of a reinforcement bar based on its diameter and length. Accurate steel weight calculation is essential for:
- Preparing BOQs (Bill of Quantities)
- Reinforcement estimation
- Procurement and material planning
- Billing and quantity verification
- Cost estimation
- Site inventory management
Since reinforcement steel is supplied and billed by weight, knowing the exact weight helps minimize wastage and control project costs.
Steel Weight Formula
The standard formula used for reinforcement steel is:
Weight (kg) = (D² × L) / 162
Where:
- D = Diameter of the bar (mm)
- L = Length of the bar (m)
- 162 = Constant derived from the density of steel (7850 kg/m³)
Weight of 1 metre bar
| Bar Diameter | Unit Weight (kg/m) |
|---|---|
| 6 mm | 0.222 |
| 8 mm | 0.395 |
| 10 mm | 0.617 |
| 12 mm | 0.888 |
| 16 mm | 1.580 |
| 20 mm | 2.469 |
| 25 mm | 3.858 |
| 28 mm | 4.839 |
| 32 mm | 6.321 |
| 36 mm | 7.998 |
| 40 mm | 9.876 |
Steel Weight Chart
The table below shows the approximate weight of one 12-metre reinforcement bar.
| Bar Diameter | Weight per Metre (kg) | Weight of 12 m Bar (kg) |
|---|---|---|
| 6 mm | 0.222 | 2.66 |
| 8 mm | 0.395 | 4.74 |
| 10 mm | 0.617 | 7.40 |
| 12 mm | 0.888 | 10.66 |
| 16 mm | 1.580 | 18.96 |
| 20 mm | 2.469 | 29.63 |
| 25 mm | 3.858 | 46.30 |
| 28 mm | 4.839 | 58.07 |
| 32 mm | 6.321 | 75.85 |
| 36 mm | 7.998 | 95.98 |
| 40 mm | 9.876 | 118.51 |
Calculation Examples
Example 1
Calculate the weight of one 16 mm bar having a length of 12 metres.
Weight = (16² × 12) ÷ 162
Weight = 18.96 kg
Example 2
Calculate the weight of 25 bars of 20 mm diameter, each 12 metres long.
Weight of one bar = 29.63 kg
Total Weight = 29.63 × 25
Total Steel Weight = 740.75 kg
Example 3
Calculate the weight of a 12 mm reinforcement bar with a length of 8 metres.
Weight = (12² × 8) ÷ 162
Weight = 7.11 kg
Why Use Our Steel Weight Calculator?
- Instant and accurate calculations
- Supports all standard reinforcement bar diameters
- Eliminates manual calculation errors
- Mobile-friendly and easy to use
- Ideal for BOQ preparation and quantity estimation
- Completely free online tool
Frequently Asked Questions (FAQs)
What is the formula for calculating steel weight?
The standard formula is:
Weight (kg) = (Diameter² × Length) ÷ 162
Why is 162 used in the formula?
The constant 162 is derived from the density of steel (7850 kg/m³) and simplifies the calculation for reinforcement bars.
What is the weight of a 12 mm steel bar?
A 12 mm reinforcement bar weighs approximately 0.888 kg per metre.
What is the weight of one 16 mm bar of 12 metres?
Approximately 18.96 kg.
Which steel bar sizes are commonly used?
The most common reinforcement bar diameters are:
6 mm, 8 mm, 10 mm, 12 mm, 16 mm, 20 mm, 25 mm, 28 mm, 32 mm, 36 mm and 40 mm.
Fly Ash & GGBS in Ready Mix Concrete – Advantages, Disadvantages, IS Code Guidelines & Technical Requirements
IS Code Reference
The calculation of reinforcement steel quantities should be carried out in accordance with applicable Indian Standards, including:
- IS 1786 – High Strength Deformed Steel Bars and Wires for Concrete Reinforcement
- IS 456:2000 – Plain and Reinforced Concrete – Code of Practice
- IS 2502 – Code of Practice for Bending and Fixing of Reinforcement Bars
- IS 875 (Relevant Parts) – Design Loads (where applicable)
For the complete and latest standards, refer to the official Bureau of Indian Standards (BIS) publications.
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Conclusion
The Steel Weight Calculator is an essential tool for every civil engineer, contractor, quantity surveyor, and construction professional. It enables quick and accurate estimation of reinforcement steel quantities, helping improve project planning, procurement, billing, and cost control. Use this calculator to save time, reduce calculation errors, and streamline your construction estimates.
Frequently Asked Questions (FAQs)
1. What is a Steel Weight Calculator?
A Steel Weight Calculator is an online tool that calculates the weight of reinforcement (TMT) steel bars based on their diameter, length, and quantity. It provides instant results in kilograms (kg) and metric tonnes (MT).
2. What is the formula for calculating steel weight?
The standard formula is:
Steel Weight (kg) = (D² × L) ÷ 162
Where:
- D = Diameter of the steel bar (mm)
- L = Length of the bar (m)
3. Why is 162 used in the steel weight formula?
The constant 162 is derived from the density of steel (7850 kg/m³) and is used to simplify the calculation of reinforcement steel bar weight.
4. What is the unit weight of a 12 mm steel bar?
A 12 mm TMT steel bar weighs approximately 0.888 kg per metre.
5. What is the weight of one 16 mm steel bar of 12 metres?
A 16 mm diameter bar with a length of 12 metres weighs approximately 18.96 kg.
6. Which reinforcement bar sizes can I calculate?
This calculator supports standard TMT bar diameters, including:
6 mm, 8 mm, 10 mm, 12 mm, 16 mm, 20 mm, 25 mm, 28 mm, 32 mm, 36 mm, and 40 mm.
7. Is this Steel Weight Calculator accurate?
Yes. The calculator uses the standard reinforcement steel weight formula based on the density of steel and provides accurate results for estimation, procurement, and quantity calculations.
8. Who can use this calculator?
This calculator is useful for:
- Civil Engineers
- Structural Engineers
- Quantity Surveyors
- Contractors
- Site Engineers
- Architects
- Engineering Students
9. Can I calculate the total weight of multiple steel bars?
Yes. Simply enter the diameter, length, and number of bars, and the calculator will automatically calculate the total steel weight.
10. Which IS Codes are applicable for reinforcement steel?
The relevant Indian Standards include:
- IS 1786 – High Strength Deformed Steel Bars and Wires for Concrete Reinforcement
- IS 456:2000 – Plain and Reinforced Concrete – Code of Practice
- IS 2502 – Code of Practice for Bending and Fixing of Reinforcement Bars
11. Why is calculating steel weight important?
Accurate steel weight calculation helps in:
- BOQ preparation
- Material estimation
- Cost control
- Procurement planning
- Billing verification
- Reducing material wastage
12. Is this Steel Weight Calculator free to use?
Yes. The CivilInfoHub Steel Weight Calculator is completely free and can be used anytime for quick and accurate reinforcement steel weight calculations.
Disclaimer
The Steel Weight Calculator is provided for general estimation and educational purposes only. The calculated values are based on the standard reinforcement steel weight formula (D² × L) ÷ 162 and assume a steel density of 7850 kg/m³. Actual steel weight may vary slightly depending on the manufacturer, rolling tolerances, product specifications, and applicable standards.
While every effort has been made to ensure the accuracy of this calculator, CivilInfoHub does not guarantee that the results are free from errors or suitable for every project. Users should always verify calculations against approved structural drawings, Bar Bending Schedules (BBS), project specifications, and the latest applicable Indian Standards (IS Codes) before procurement, fabrication, or construction.
CivilInfoHub shall not be held responsible for any loss, damage, or consequences arising from the use of this calculator or the information provided. Users are advised to consult a qualified civil or structural engineer for project-specific calculations and technical decisions.
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