How accurate is the D²/162.2 formula?

The formula gives nominal weight values that match manufacturer data sheets within ±3 % . This level of accuracy is accepted industry-wide for ordering, cost estimation, and structural design checks.

Does bar grade affect the weight?

No. Grade refers to yield strength (e.g., 420 MPa for Grade 60), not density. A 16 mm Grade 40 bar and a 16 mm Grade 60 bar have the same weight per metre. Only the diameter determines weight.

What is the standard length of rebar in the UAE?

Most suppliers in the UAE deliver rebar in 12-metre stock lengths . Custom cut-to-length orders are available but may carry a surcharge. Always confirm with your steel supplier before placing an order.

How do I convert rebar weight from kg to tonnes?

Divide the total weight in kilograms by 1,000 . For example, 4,500 kg = 4.5 tonnes. Steel prices in the UAE are typically quoted per metric tonne.

Can I use this calculator for galvanised or epoxy-coated rebar?

Yes. The coating adds less than 1–2 % to the overall weight, which is within normal manufacturing tolerance. You can safely use the same formula for coated bars.

What rebar sizes are most common for residential construction?

10 mm and 12 mm are typical for slabs and secondary beams, while 16 mm and 20 mm are used for main beams and columns in low-rise residential buildings across the UAE.

How much does rebar cost per tonne in the UAE?

Prices fluctuate with global steel markets. As a reference, Grade 60 rebar in the UAE typically ranges between AED 2,000–2,800 per tonne depending on diameter, quantity, and supplier. Always request a fresh quotation for current pricing.

Do I need to account for rebar chairs and tie wire weight?

Accessories like chairs, spacers, and tie wire usually add less than 1 % to the total reinforcement weight. They are normally excluded from bar schedule calculations but included as a lump sum in the BOQ.

Rebar Weight Calculator – Accurate Steel Reinforcement…

#	Dia.	kg/m	Length	Qty	Weight (kg)
Grand Total	—	—

Why Use a Rebar Weight Calculator?

A removes the guesswork from estimating how much steel reinforcement you actually need. Whether you're pricing a residential villa foundation in Dubai or scheduling deliveries for a high-rise in Abu Dhabi, knowing the exact weight of your reinforcement bars keeps budgets tight and logistics smooth.

Here's what this tool helps you do:

Get instant weight results – enter diameter, length, and quantity and see total weight in kilograms or tons immediately.
Support all standard bar sizes – from 6 mm stirrups to 40 mm main bars, every common rebar diameter is covered.
Reduce material waste – accurate estimates mean you order what you need, avoiding costly surplus or emergency reorders.
Speed up BOQ preparation – quantity surveyors can cross-check bar schedules against calculated weights in seconds.

The calculation follows the universal formula based on the density of mild steel (7,850 kg/m³), which is the industry standard used by engineers and steel suppliers globally. Results match the weight-per-metre values published in rebar manufacturer catalogues and international standards such as ISO 6935-2.

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The Core Formula

Every steel rebar weight calculation relies on a single, widely accepted formula:

Weight per metre (kg/m) = D² ÷ 162.2

Where D is the nominal diameter of the bar in millimetres. The constant is derived from the relationship between the cross-sectional area of a round bar and the density of steel:

162.2 = (4 × 1,000,000) ÷ (π × 7,850)

This assumes a steel density of , which applies to standard carbon steel and most TMT (Thermo-Mechanically Treated) grades used in reinforced concrete construction.

Step-by-Step Breakdown

Select the bar diameter – choose from standard sizes: 6, 8, 10, 12, 16, 20, 25, 32, or 40 mm.
Enter the bar length – this is the cut length of each piece in metres (a standard stock length is usually 12 m).
Specify the quantity – the total number of bars of that diameter and length.
Review the output – the calculator displays weight per metre, weight per bar, and total weight for the batch.

Important Notes

Actual rebar weight can vary by ±3–6 % due to manufacturing tolerances allowed under standards like ASTM A615 and BS 4449. Ribs on deformed bars add a small amount of mass above the nominal round cross-section, but the D²/162.2 formula already accounts for this by convention.

If you're working with stainless steel rebar (density ≈ 7,900–8,000 kg/m³) or epoxy-coated bars, the weight difference is marginal — typically under 2 % — and can be ignored for most ordering purposes.

Example 1 – Foundation Slab for a Villa in Dubai

A contractor is building a residential villa near Dubai Marina. The raft foundation requires 150 pieces of 16 mm diameter rebar, each cut to 9 m lengths.

Unit weight = 16² ÷ 162.2 = 256 ÷ 162.2 = 1.578 kg/m
Weight per bar = 1.578 × 9 = 14.20 kg
Total weight = 14.20 × 150 = 2,130 kg (2.13 tonnes)

The contractor can now request a delivery of approximately 2.2 tonnes of 16 mm rebar, adding a small buffer for cutting waste, and get an accurate quote from the steel supplier in AED per tonne.

Example 2 – Column Reinforcement for a Commercial Building in Abu Dhabi

A structural engineer is detailing columns for an office tower on Yas Island. Each column uses 12 pieces of 25 mm main bars at 3.5 m per bar, and there are 40 identical columns.

Unit weight = 25² ÷ 162.2 = 625 ÷ 162.2 = 3.854 kg/m
Weight per bar = 3.854 × 3.5 = 13.49 kg
Bars per column = 12; total bars = 12 × 40 = 480 pieces
Total weight = 13.49 × 480 = 6,475 kg (6.48 tonnes)

This covers only the main vertical bars. Stirrups and links (usually 8 mm or 10 mm) must be calculated separately and added to the total.

Example 3 – Small Quantity of Heavy Bars for a Bridge Pier

An infrastructure project in Sharjah needs 24 pieces of 40 mm rebar at the full stock length of for pile cap reinforcement.

Unit weight = 40² ÷ 162.2 = 1,600 ÷ 162.2 = 9.864 kg/m
Weight per bar = 9.864 × 12 = 118.37 kg
Total weight = 118.37 × 24 = 2,841 kg (2.84 tonnes)

Each 40 mm bar weighs nearly 120 kg, so a crane or forklift is essential for safe handling on site — a detail often overlooked during planning.

Wastage and Lap Allowances

Calculated weight represents the net steel requirement. On a real construction site, you should add 5–10 % for cutting waste and additional length for lap splices (typically 40–50 times the bar diameter as per design codes). Many UAE-based quantity surveyors use a flat 7 % wastage factor as a rule of thumb.

Steel Grades and Local Market

The most common rebar grade in the UAE market is Grade 60 (B500B), supplied by manufacturers such as Emirates Steel and Al Jazira Steel. Grade does not affect weight — it only changes the yield strength — so the D²/162.2 formula applies equally to Grade 40, Grade 60, and Grade 80 bars.

Common Mistakes to Avoid

Mixing up diameter and radius — the formula uses the full nominal diameter, not the radius.
Forgetting unit conversion — if your bar length is in centimetres or feet, convert to metres before multiplying.
Ignoring hooks and bends — bent bars are longer than the straight cut length. Add the extra development length before calculating weight.
Using a wrong constant — some online sources use 162 or 162.28. The differences are negligible, but stick with for consistency.

Expert Tip

When preparing a Bill of Quantities (BOQ) for a UAE contractor, always list rebar by diameter, total length, and weight. Suppliers price steel by weight (AED/tonne), but fabricators need length to plan cutting schedules. Providing both avoids back-and-forth during tendering.

Start Calculating Your Rebar Weight Now

Use the free calculator above to get instant, reliable steel reinforcement weight estimates for your next project. Whether it's a small villa or a mega infrastructure build, accurate rebar data saves time, money, and materials.

For more construction and engineering tools, explore our full suite of free calculators. Need help with something else? Check out our computation tools collection for everything from area conversions to structural estimates.

Rebar Weight Calculator – Accurate Steel Reinforcement Estimates