If you fabricate structural steel in India, most takeoff software will fight you on two fronts: it doesn't recognize IS 808 designations (ISMB 300 means nothing to a tool built around W-shapes), and it doesn't carry Indian weight tables, so even when you count members correctly you still key in kg/m by hand. The fix is a takeoff tool with the IS 808 catalog built in — one that reads ISMB, ISLB, ISWB, ISHB, ISMC, and ISA callouts directly off the drawing, attaches the right kg/m automatically, and totals in tonnes. SteelFlo does exactly this: it detects the standard from the drawing set itself, covers 200 IS 808 sections alongside five other standards, and gives you 3 free takeoffs to test it on your own drawings.
Here's what that means in practice, family by family, and what to check before you trust any tool with an Indian drawing set.
Why do generic takeoff tools fail on IS 808 drawings?
Three reasons, in order of how much money they cost you.
1. The section library doesn't know Indian shapes. Tools built for the US market ship with the AISC database. Type "ISMB 400" into one of them and you get either nothing or a manual entry form. Now you're maintaining your own weight table in a spreadsheet next to the takeoff tool — which is the exact double-entry problem you bought software to eliminate.
2. The weights are wrong even when the shape is "supported." Some tools let you add custom sections, but then the weight is whatever someone in your office typed in three years ago. IS 808 weights have real traps: ISMB 300 appears as 46.1 kg/m in older producer charts and 44.2 kg/m in references consistent with IS 808:2021. If your tool's custom entry came from the old chart, you're carrying roughly 4% extra on every ISMB 300 in every bid. Our IS 808 section guide covers this edition discrepancy in detail.
3. Imperial assumptions leak everywhere. A tool that thinks in feet and lbs/ft will happily convert, but conversion is where errors hide — a length read as feet instead of meters, a total in lbs when your supplier quotes per tonne. You want kg/m in and tonnes out with no unit gymnastics in between.
This is the same failure mode fabricators outside the US hit constantly — we wrote up the general case in why a takeoff tool needs multiple standards.
Which IS 808 sections does the software need to cover?
All six hot-rolled families, plus the light channels. Here's the coverage a real Indian drawing set demands, with representative weights from the IS 808 catalog:
| Family | What it is | Sizes in catalog | Example | Weight (kg/m) |
|---|---|---|---|---|
| ISMB | Medium-weight beams — the workhorse | 14 | ISMB 300 | 44.2 |
| ISLB | Light-weight beams | 17 | ISLB 600 | 99.5 |
| ISWB | Wide-flange beams | 13 | ISWB 600 | 134.0 |
| ISHB | Heavy-weight beams / columns | 8 | ISHB 450 | 87.2 |
| ISMC | Medium-weight channels | 11 | ISMC 250 | 30.4 |
| ISLC | Light-weight channels | 11 | ISLC (parallel series) | — |
| ISA | Equal and unequal angles | 126 | ISA 75x75x8 | 8.9 |
That's 200 sections. The angle count matters more than it looks: ISA callouts dominate bracing, purlin cleats, and connection material on Indian industrial drawings, and the size range runs from ISA 20x20x3 up through 200-series unequal legs. A tool that covers beams but makes you hand-enter angles still leaves half the line items manual.
A quick sanity check you can run on any tool in five minutes: ask it for ISMB 300 (should return 44.2 kg/m, 300 deep, 140 flange), ISMC 150 (16.4 kg/m), and ISA 100x100x10 (14.9 kg/m). If any of those come back empty or with a different weight, ask the vendor which IS 808 edition their table traces to.
How does automatic standard detection handle Indian drawing sets?
You shouldn't have to tell the software "this is an Indian drawing." SteelFlo reads the drawing set and identifies the standard from the section callouts themselves — ISMB and ISA labels look nothing like W12X26 or 310UB40, and the software uses that to pick the right catalog before it starts counting.
From there the workflow is the same as any takeoff:
- Upload the PDF. Multi-page drawing sets are fine; each page is processed.
- AI finds every steel member label on every page and draws a bounding box around each occurrence. Seven boxes labeled ISMB 400 means seven pieces — no "typical of 4" inference, no hidden multipliers.
- You review the boxes. Confirm, reject, or correct. This human-verification step is why the accuracy claim is 95-99% — that's AI detection plus your review, not raw AI output.
- Export the BOM with designations, counts, and weights already attached.
The review step deserves emphasis for anyone burned by "fully automatic" tools: the count is the number of boxes you can see and check. On a fabrication drawing where a missed member is real money, auditability beats magic.
Does it handle metric weights end-to-end — kg/m in, tonnes out?
Yes, and this is worth verifying on any tool you evaluate, not just taking from the brochure. The IS 808 catalog weights are stored as published — kg/m per the standard — and when a drawing is detected as an IS set, lengths, unit weights, and totals display in metric. Your BOM comes out in the units your supplier and your workshop actually use.
Worked example, a small shed frame:
| Section | Count | Length each (m) | kg/m | Line weight (kg) |
|---|---|---|---|---|
| ISMB 400 | 6 | 9.0 | 61.6 | 3,326 |
| ISMB 200 | 12 | 6.0 | 25.4 | 1,829 |
| ISMC 150 | 18 | 4.5 | 16.4 | 1,328 |
| ISA 75x75x8 | 40 | 2.2 | 8.9 | 783 |
| Total | 7,266 kg ≈ 7.27 t |
At a steel rate of ₹58,000 per tonne, that's roughly ₹4.2 lakh in material — and a 46.1-vs-44.2 kg/m error on the ISMB weights alone would move the number by thousands of rupees on even this small job. Multiply across a 200-tonne industrial project and the weight table stops being a detail.
Does it work with mixed IS + international sections?
It does, and mixed sets are more common than vendors admit. Indian projects for multinational clients frequently carry European parallel-flange sections (the NPB/WPB series that IS 808:2021 pulled in, dimensionally aligned with IPE/HE), imported equipment platforms detailed in AISC shapes, or cold-formed purlins from a separate supplier catalog.
SteelFlo detects across six standards — AISC (US), BS/IS (UK/India), EN (Europe), AS/NZS (Australia/NZ), GB (China), and CFS/SSMA (cold-formed) — with 4,500+ sections total. A drawing set that mixes ISMB frames with IPE mezzanine beams gets both identified, each with its correct catalog weight. If you regularly work across regions, the broader picture is in steel takeoffs beyond AISC.
One honest caveat: shop-fabricated built-up sections and plate girders detailed as plate callouts are counted as plates, not resolved against a rolled-section catalog — same as every other takeoff tool. The catalog handles what the mills roll.
What does it cost for an Indian shop?
Two numbers:
- 3 free takeoffs. Full-function, no card required. Upload your own IS 808 drawings — not a vendor demo set — and check the counts and weights against a job you've already estimated by hand. That's the only evaluation that means anything.
- SteelFlo Pro at $399/month after that. At current exchange rates that's roughly ₹33,000-35,000/month. The payback math for a shop bidding regularly: if a manual takeoff on a mid-size drawing set takes an estimator two days and the software gets you to a reviewed BOM in a few hours, the subscription pays for itself inside one or two tenders — before counting the bids you can now respond to that you previously declined for lack of estimating hours.
Pricing is flat and published — no per-seat negotiation, no "contact sales" tier. Comparison with other tools' pricing models is on the steel takeoff software page.
FAQ
Does it work with scanned or raster drawings?
Yes. Plenty of Indian drawing sets circulate as scans — old jobs being re-tendered, prints marked up and re-scanned, drawings from consultants who only issue flattened PDFs. SteelFlo handles both vector PDFs and scanned/raster pages; scanned pages take more processing but go through the same detect-then-review flow. The review step matters more on scans, since scan quality varies — which is exactly why every detection is a visible box you can check rather than a number in a summary.
What about drawings with Hindi or mixed Hindi/English notes?
Section callouts on Indian structural drawings are almost universally in Latin characters — ISMB 300 is ISMB 300 regardless of the language of the general notes. The software keys on the section designations, so Hindi title blocks, notes, or revision clouds don't interfere with member detection. What you should verify on your own drawings: any non-standard shorthand your detailers use (a local convention like "MB300" instead of "ISMB 300") gets caught in review, where you can correct the label once and confirm the rest.
What export formats do I get?
CSV for the bill of materials — designation, count, lengths, kg/m, and total weight — which drops into Excel or whatever costing sheet your office runs. You also get a cut list, an order sheet with nesting against stock lengths, and a highlighted PDF showing every detected member boxed on the original drawing. That last one is underrated: it's the artifact you hand to a checker, or to a client who asks "how did you get this tonnage?"
Can I price the job inside the tool, or just count it?
Both paths work. Export the BOM and price it in your own sheets, or use the built-in pricing flow to go from reviewed takeoff to an estimate with your rates. Most Indian shops we see start BOM-only — the counting and weight lookup is where the time goes — and adopt pricing later.
The cheapest way to know whether any of this holds up on your drawings is to test it on your drawings. Upload an IS 808 drawing set to SteelFlo — the first 3 takeoffs are free, no card required — review the boxes against your own count, and check the tonnage against a job you've already priced. If the numbers hold, you've found your workflow; if they don't, you've spent an hour finding out instead of a subscription.