TMT Bar Weight Chart — 8mm 10mm 12mm 16mm 20mm 25mm Rod Weight per Metre & per Bundle (India 2026)
Kavitha from Kolathur was about to sign for an 8.5-tonne TMT delivery when something made her pause. She'd printed a weight chart from a contractor friend the week before and kept it on her phone. Out of curiosity, she asked the delivery team to lift one bundle of 12mm bars onto the weighbridge at the corner depot. The bundle weighed 47 kg. The chart said it should weigh roughly 53 kg. Across her 8.5-tonne order, that 11% short-weighting added up to 930 kg of steel she was paying for but not receiving — about ₹54,800 of invisible loss.
She refused the delivery, called her contractor, and the supplier "found a counting error." The chart saved her ₹54,800 in five minutes.
If you're about to take TMT delivery in Chennai today, save the tables below to your phone first — and call our steel desk at +91 93848 19295 or +91 93848 19297 if any number on your delivery doesn't match. Or browse fully-weighed, batch-verified TMT on our TMT bars & steel collection.
Where D = nominal diameter of the bar in mm. Derived from the density of steel (7,850 kg/m³) and the cross-sectional area of a circle. Any IS 1786-compliant bar falls within ±3% of this formula.
Master TMT Weight Chart — Per Metre, Per 12m Bar, Per Bundle
The chart below is the official IS 1786 weight standard, which every brand (Tata Tiscon, JSW Neosteel, Agni, Vizag, SAIL, and all ISI-marked TMT) must comply with. Standard bar length in India is 12 metres. Bundle weights are typical industry figures and may vary slightly by manufacturer — always confirm with your supplier.
| Diameter | Weight per Metre | Weight per 12m Bar | Bars per Tonne (12m) | Typical Bundle Weight |
|---|---|---|---|---|
| 8mm | 0.395 kg | 4.74 kg | ~211 bars | ~50 kg |
| 10mm | 0.617 kg | 7.40 kg | ~135 bars | ~52 kg |
| 12mm | 0.888 kg | 10.66 kg | ~94 bars | ~53 kg |
| 16mm | 1.580 kg | 18.96 kg | ~53 bars | ~57 kg |
| 20mm | 2.469 kg | 29.63 kg | ~34 bars | ~59 kg |
| 25mm | 3.858 kg | 46.30 kg | ~22 bars | ~46 kg |
For diameters not listed (6mm, 28mm, 32mm), use the formula above. The chart covers the six diameters that account for over 95% of residential and small-commercial construction in India.
The Single Most Useful Document a Chennai Builder Can Carry
Take a screenshot of the table above and save it on every site engineer's phone. The 30-second download is the difference between catching ₹50,000+ short-weighting frauds and signing for them.
Got a delivery you're unsure about? WhatsApp the weights — we'll verify against IS 1786 in 5 min — Mon–Sat 9am–7pm.
Why Every Chennai Builder Should Save This Chart to Their Phone
A Trusted Two-Year Supplier, A Crane Scale, Three Audits — ₹41,000 Bleeding Monthly
A contractor — let's call him Arun — was running three simultaneous projects across Velachery, Pallikaranai, and Madipakkam. He had a steel supplier he'd worked with for two years. Then his junior site engineer started carrying a weight chart and a digital crane scale. Three deliveries audited in two weeks:
Arun ended the relationship and switched suppliers. The 7-tonne short-weighting across those three projects had cost him roughly ₹41,000 — most of his profit margin on those slabs. The chart didn't catch a one-time fraud. It caught a consistent ₹15,000–₹20,000 monthly leakage that had been happening for two years.
Three reasons short-weighting on TMT deliveries is the most common construction-material fraud in Chennai:
Visual Deception Is Easy
A bundle of 12mm bars looks identical at 47 kg vs 53 kg. Without weighing, the eye cannot distinguish.
Site Weighbridges Are Rare
Most residential sites accept supplier delivery without weighing. The ₹50–₹100 weighbridge fee feels avoidable until you do the math: 5% short-weight across 8 tonnes = ₹24,000–₹30,000 lost.
"Counting Errors" Are Easy to Claim
Even when caught, suppliers rarely refund — they "adjust next time." For one-off homeowners with no next time, that adjustment never happens.
How to Use This Chart to Verify a Delivery
Five steps, less than five minutes total, on every TMT delivery. Train your site engineer to run this every single time:
Count Bundles by Diameter
The supplier's invoice lists tonnage per diameter. Verify the count of bundles matches the per-bundle weight in the chart before unloading begins.
Random-Weigh At Least One Bundle Per Diameter
Use a digital crane scale (₹2,500 from any hardware store — pays for itself on the first delivery), or take one bundle to the nearest weighbridge.
One-time spend: ₹2,500 · ROI: First deliveryCompare to the Chart
A 12mm bundle of 5 bars should weigh 53 kg ± 1.5 kg. A 16mm bundle of 3 bars should weigh 57 kg ± 1.5 kg. Anything more than 3% short is a problem.
Cross-Check the Per-Bar Count
Open one bundle and physically count the bars. Multiply by the per-bar weight from the chart. Compare to the bundle weight on the scale. Both numbers should agree.
If Short-Weighted, Do Not Sign
The moment you sign, you've accepted the quantity. Document the short-weight with photos and demand replacement bars or proportional refund before signing.
Never sign first, dispute later — that fight is already lostConvert Weight to Today's Cost — April 2026 Chennai Rates
Real Buildiyo Store rates this week per kg, including same-day delivery within Chennai for orders before 1 PM. The 12mm reference column shows what one full 12-metre bar (10.66 kg) and one full bundle (5 bars × 10.66 kg = 53.3 kg) costs at each brand:
| Brand & Grade | Rate per kg | Cost per 12m Bar (12mm) | Cost per Bundle (12mm × 5 bars) |
|---|---|---|---|
| Tata Tiscon Fe 500 | ₹62 | ₹661 | ₹3,305 |
| JSW Neosteel Fe 500D | ₹59 | ₹629 | ₹3,145 |
| Agni Steels Fe 500 | ₹55 | ₹586 | ₹2,930 |
| Vizag Steel Fe 500 | ₹57 | ₹608 | ₹3,040 |
| Tata Tiscon Fe 550 SD (premium) | ₹68 | ₹725 | ₹3,625 |
To convert any weight in kg to today's cost: multiply the weight by the per-kg rate above. For larger orders, switch the rate to bulk-tier pricing (typically ₹2–3/kg below retail).
Send us your delivery weights —
we'll verify against IS 1786 free
WhatsApp photos of the weighbridge slip and bundle counts to our steel desk. We'll cross-check against IS 1786 standards within the hour and tell you whether to accept the delivery, refuse it, or demand a refund. Free of charge — even if you're not ordering from us.
Why Bundle Weights Vary Slightly Between Brands
The per-metre weight in IS 1786 is fixed by formula, but bundle weight is a packaging decision — not a regulated standard. Three tiers of bundling behaviour you'll see in real Chennai deliveries:
Tata Tiscon & JSW Neosteel
Typically follow industry-standard bundle counts (5 bars for 12mm, 3 bars for 16mm, etc.) producing ~50–57 kg bundles for clean handling. Bundle weight is reliably predictable.
Agni Steels & Vizag Steel
Sometimes use loose bars or larger bundles for certain diameters depending on the depot serving Chennai. Always confirm the bundle structure on the dispatch note before counting.
Smaller Regional Rolling Mills
Avoid for structural work. Bundle inconsistently or short-cut bar lengths to 11.7m or 11.8m, which silently saves the supplier 2–3% material per bundle. The per-metre weight is correct; the per-bar weight is short.
Defence Against Short-Length Cheating: Measure One Bar Per Bundle
Standard length is 12,000 mm — anything below 11,950 mm is non-conforming. Carry a tape measure on every TMT delivery. Lay one bar from each bundle flat and measure end-to-end. Takes 30 seconds. Catches the most invisible TMT fraud in the market.
What Else Builders Order Alongside Bulk TMT
Contractors verifying TMT deliveries with this chart are typically managing one or more active sites with cement orders following within days. For a typical Chennai project, every 1 tonne of structural TMT is paired with roughly 50–60 cement bags across foundation, columns, beams, and slabs.
Browse the full brand range in our cement collection on Buildiyo Store with same-day delivery and the same batch-verification standards we apply to TMT. Bag count, brand stamp, and freshness verified on every dispatch.
If You Order More Than 2 Tonnes — The Bulk Tier Saves the Most
Weight charts matter most for bulk buyers because the absolute-rupee impact of a 5% short-weight scales with tonnage. Buildiyo runs a dedicated bulk-supply program for builders that compresses depot, distributor, and dealer margins:
Tier 1 — Project Builder
₹2–3/kg below quoted retail. Crucially, every bulk delivery comes with a weighbridge slip from our depot — no need for site verification.
Tier 2 — Multi-Site Contractor
Factory-gate pricing. 30-day credit terms after first three orders. Dedicated relationship desk for repeat ordering.
Tier 3 — Direct Factory Dispatch
Direct factory dispatch with allocated coordinator and weekly stock review.
For Chennai contractors managing multiple sites, the bulk tier doesn't just save per-kg margin — it removes the verification overhead entirely because every dispatch is depot-weighed before leaving.
Builder running multiple sites? Bulk tier dispatches arrive with weighbridge slip — verification overhead removed.
Honest Weights Are the Floor of Honest Construction
Kavitha from Kolathur saved ₹54,800 in five minutes because she had a chart on her phone. Arun the contractor caught a ₹15,000-monthly leakage that had been bleeding two years of his profit. The chart works. Save the tables above. And if anything ever doesn't add up, call us — we'll verify it for free, whether you're ordering from us or not. Honest weights are the floor of honest construction. Call us. We'll do it right the first time.
Frequently Asked Questions
Direct answers on TMT bar weights, IS 1786 standards, and delivery verification for April 2026.
More Construction Material Resources
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