Where these numbers come from
Standard: IS 808:2021, Hot Rolled Steel Beam, Column, Channel and Angle Sections — Dimensions and Properties (fourth revision). Every mass is copied from its tables and checked against IS 808:1989 (Edition 4.1, incorporating Amendment No. 1), the edition most printed charts still follow.
Formula: kg/m = sectional area (cm²) × 0.785, because IS 1852:1985 (clause 3.1) calculates nominal weight with steel at 7.85 g/cm³. We re-derived every row from its printed area this way. For a load: weight (kg) = kg/m × length (m) × pieces.
Tolerance: actual mill weights vary within the IS 1852 tolerance: ±2.5% per metre for beams and channels, +5% / −3% for angles over 3 mm thick. Bill the weighed weight, not the chart weight.
Section weight calculator
Pick a section, enter the length of each piece and how many pieces. The result uses the IS 808:2021 kg/m figure from the tables below and shows the range the load can weigh within IS 1852 tolerance.
Tolerance band: ±2.5% for ISMB and ISMC; +5% / −3% for angles over 3 mm thick; ±5% for 3 mm angles (IS 1852:1985). The value excludes GST.
ISMB beam weight chart (kg/m)
ISMB is the Indian Standard medium weight beam, a sloping-flange I-section; the number is the depth in mm. D is depth, B flange width, t web thickness and T mean flange thickness.
| Designation | D (mm) | B (mm) | t (mm) | T (mm) | kg/m IS 808:2021 | kg/m IS 808:1989 |
|---|---|---|---|---|---|---|
| ISMB 100 | 100 | 50 | 4.7 | 7.0 | 8.95 | 8.9 |
| ISMB 125 | 125 | 70 | 5.0 | 8.0 | 13.35 | 13.3 |
| ISMB 150 | 150 | 75 | 5.0 | 8.0 | 14.96 | 15.0 |
| ISMB 175 | 175 | 85 | 5.8 | 9.0 | 19.50 | 19.6 ▲ |
| ISMB 200 | 200 | 100 | 5.7 | 10.0 | 24.17 | 24.2 |
| ISMB 225 | 225 | 110 | 6.5 | 11.8 | 31.15 | 31.1 |
| ISMB 250 | 250 | 125 | 6.9 | 12.5 | 37.30 | 37.3 |
| ISMB 300 | 300 | 140 | 7.7 | 13.1 | 46.02 | 46.0 |
| ISMB 350 | 350 | 140 | 8.1 | 14.2 | 52.33 | 52.4 ▲ |
| ISMB 400 | 400 | 140 | 8.9 | 16.0 | 61.55 | 61.5 |
| ISMB 450 | 450 | 150 | 9.4 | 17.4 | 72.38 | 72.4 |
| ISMB 500 | 500 | 180 | 10.2 | 17.2 | 86.88 | 86.9 |
| ISMB 550 | 550 | 190 | 11.2 | 19.3 | 103.64 | 104 |
| ISMB 600 | 600 | 210 | 12.0 | 20.3 | 121.00 | 123 ▲ |
▲ The 1989 figure differs from the 2021 figure by more than rounding: ISMB 175 (19.50 vs 19.6), ISMB 350 (52.33 vs 52.4) and ISMB 600 (121.00 vs 123). The dimensions are the same in both editions; the 2021 masses agree with the sectional areas it prints to within 1%.
ISMC channel weight chart (kg/m)
ISMC is the Indian Standard medium weight channel with sloping flanges. For these sizes, the masses and dimensions are identical in IS 808:1989 and IS 808:2021.
| Designation | D (mm) | B (mm) | t (mm) | T (mm) | kg/m IS 808:2021 | kg/m IS 808:1989 |
|---|---|---|---|---|---|---|
| ISMC 75 | 75 | 40 | 4.8 | 7.5 | 7.14 | 7.14 |
| ISMC 100 | 100 | 50 | 5.0 | 7.7 | 9.56 | 9.56 |
| ISMC 125 | 125 | 65 | 5.3 | 8.2 | 13.1 | 13.1 |
| ISMC 150 | 150 | 75 | 5.7 | 9.0 | 16.8 | 16.8 |
| ISMC 175 | 175 | 75 | 6.0 | 10.2 | 19.6 | 19.6 |
| ISMC 200 | 200 | 75 | 6.2 | 11.4 | 22.3 | 22.3 |
| ISMC 225 | 225 | 80 | 6.5 | 12.4 | 26.1 | 26.1 |
| ISMC 250 | 250 | 80 | 7.2 | 14.1 | 30.6 | 30.6 |
| ISMC 300 | 300 | 90 | 7.8 | 13.6 | 36.3 | 36.3 |
| ISMC 350 | 350 | 100 | 8.3 | 13.5 | 42.7 | 42.7 |
| ISMC 400 | 400 | 100 | 8.8 | 15.3 | 50.1 | 50.1 |
Heavier ISMC variants
IS 808 also lists a heavier version of several channel sizes with a thicker web and a slightly wider flange. It marks them with an asterisk; IS 808:1989 notes they are intended for the wagon industry and are rolled on the same rolls as the lighter section. If an order just says “ISMC 250”, it means the standard section in the table above.
| Designation | D (mm) | B (mm) | t (mm) | T (mm) | kg/m IS 808:2021 | kg/m IS 808:1989 |
|---|---|---|---|---|---|---|
| ISMC 125 (heavy, 6.0 mm web) | 125 | 66 | 6.0 | 8.1 | 13.7 | 13.7 |
| ISMC 150 (heavy, 6.5 mm web) | 150 | 76 | 6.5 | 9.0 | 17.7 | 17.7 |
| ISMC 175 (heavy, 7.5 mm web) | 175 | 76 | 7.5 | 10.2 | 22.7 * | 22.7 |
| ISMC 200 (heavy, 7.5 mm web) | 200 | 76 | 7.5 | 11.4 | 24.3 | 24.3 |
| ISMC 225 (heavy, 9.0 mm web) | 225 | 82 | 9.0 | 12.4 | 30.7 | 30.7 |
| ISMC 250 (heavy, 9.0 mm web) | 250 | 82 | 9.0 | 14.1 | 34.2 | 34.2 |
| ISMC 250 (heavy, 11.0 mm web) | 250 | 83 | 11.0 | 14.1 | 38.1 | 38.1 |
| ISMC 300 (heavy, 10.0 mm web) | 300 | 92 | 10.0 | 13.6 | 41.5 | 41.5 |
| ISMC 300 (heavy, 12.0 mm web) | 300 | 93 | 12.0 | 13.6 | 46.2 | 46.2 |
* For the heavy ISMC 175 (7.5 mm web), both editions print 22.7 kg/m, but the printed sectional area (27.3 cm² in 2021) works out to 21.4 kg/m at 7.85 g/cm³. Every other row matches its area to within about 1%. We show the printed figure; confirm this section’s weight with the mill before billing on it.
Many online channel charts show 6.8 kg/m for ISMC 75, 9.2 for ISMC 100, 12.7 for ISMC 125 and 16.4 for ISMC 150, with thinner webs (4.4 mm on ISMC 75). Those profiles are not the ones in IS 808:1989 or IS 808:2021, which both give 7.14, 9.56, 13.1 and 16.8 kg/m with a 4.8 mm web on ISMC 75. At least one section database files the lighter profile under IS SP 6(1).
ISA equal angle weight chart (kg/m)
ISA equal angles are written leg × leg × thickness in mm, so ISA 50×50×6 has two 50 mm legs, 6 mm thick. This is the full main list of equal angles in IS 808:2021 (Table 9); the supplementary list is not included.
| Designation | Leg (mm) | Thickness (mm) | kg/m IS 808:2021 | kg/m IS 808:1989 |
|---|---|---|---|---|
| ISA 20×20×3 | 20 | 3 | 0.90 | 0.9 |
| ISA 20×20×4 | 20 | 4 | 1.16 | 1.1 |
| ISA 25×25×3 | 25 | 3 | 1.14 | 1.1 |
| ISA 25×25×4 | 25 | 4 | 1.48 | 1.4 |
| ISA 25×25×5 | 25 | 5 | 1.80 | 1.8 |
| ISA 30×30×3 | 30 | 3 | 1.38 | 1.4 |
| ISA 30×30×4 | 30 | 4 | 1.80 | 1.8 |
| ISA 30×30×5 | 30 | 5 | 2.20 | 2.2 |
| ISA 35×35×3 | 35 | 3 | 1.62 | 1.6 |
| ISA 35×35×4 | 35 | 4 | 2.11 | 2.1 |
| ISA 35×35×5 | 35 | 5 | 2.59 | 2.6 |
| ISA 35×35×6 | 35 | 6 | 3.06 | 3.0 |
| ISA 40×40×3 | 40 | 3 | 1.86 | 1.8 |
| ISA 40×40×4 | 40 | 4 | 2.44 | 2.4 |
| ISA 40×40×5 | 40 | 5 | 2.99 | 3.0 |
| ISA 40×40×6 | 40 | 6 | 3.54 | 3.5 |
| ISA 45×45×3 | 45 | 3 | 2.10 | 2.1 |
| ISA 45×45×4 | 45 | 4 | 2.75 | 2.7 |
| ISA 45×45×5 | 45 | 5 | 3.39 | 3.4 |
| ISA 45×45×6 | 45 | 6 | 4.01 | 4.0 |
| ISA 50×50×3 | 50 | 3 | 2.34 | 2.3 |
| ISA 50×50×4 | 50 | 4 | 3.08 | 3.0 |
| ISA 50×50×5 | 50 | 5 | 3.79 | 3.8 |
| ISA 50×50×6 | 50 | 6 | 4.49 | 4.5 |
| ISA 55×55×4 | 55 | 4 | 3.40 | 3.3 |
| ISA 55×55×5 | 55 | 5 | 4.19 | 4.1 |
| ISA 55×55×6 | 55 | 6 | 4.97 | 4.9 |
| ISA 55×55×8 | 55 | 8 | 6.48 | 6.4 |
| ISA 60×60×4 | 60 | 4 | 3.71 | 3.70 |
| ISA 60×60×5 | 60 | 5 | 4.58 | 4.5 |
| ISA 60×60×6 | 60 | 6 | 5.44 | 5.4 |
| ISA 60×60×8 | 60 | 8 | 7.10 | 7.0 |
| ISA 65×65×4 | 65 | 4 | 4.03 | 4.0 |
| ISA 65×65×5 | 65 | 5 | 4.98 | 4.9 |
| ISA 65×65×6 | 65 | 6 | 5.91 | 5.8 |
| ISA 65×65×8 | 65 | 8 | 7.73 | 7.7 |
| ISA 70×70×5 | 70 | 5 | 5.38 | 5.3 |
| ISA 70×70×6 | 70 | 6 | 6.39 | 6.3 |
| ISA 70×70×8 | 70 | 8 | 8.37 | 8.3 |
| ISA 70×70×10 | 70 | 10 | 10.29 | 10.2 |
| ISA 75×75×5 | 75 | 5 | 5.77 | 5.7 |
| ISA 75×75×6 | 75 | 6 | 6.86 | 6.8 |
| ISA 75×75×8 | 75 | 8 | 9.00 | 8.9 |
| ISA 75×75×10 | 75 | 10 | 11.07 | 11.0 |
| ISA 80×80×6 | 80 | 6 | 7.36 | 7.3 |
| ISA 80×80×8 | 80 | 8 | 9.65 | 9.6 |
| ISA 80×80×10 | 80 | 10 | 11.88 | 11.8 |
| ISA 80×80×12 | 80 | 12 | 14.05 | 14.0 |
| ISA 90×90×6 | 90 | 6 | 8.32 | 8.2 |
| ISA 90×90×8 | 90 | 8 | 10.92 | 10.8 |
| ISA 90×90×10 | 90 | 10 | 13.47 | 13.4 |
| ISA 90×90×12 | 90 | 12 | 15.95 | 15.8 |
| ISA 100×100×6 | 100 | 6 | 9.26 | 9.2 |
| ISA 100×100×8 | 100 | 8 | 12.18 | 12.1 |
| ISA 100×100×10 | 100 | 10 | 15.04 | 14.9 |
| ISA 100×100×12 | 100 | 12 | 17.83 | 17.7 |
| ISA 110×110×8 | 110 | 8 | 13.40 | 13.4 |
| ISA 110×110×10 | 110 | 10 | 16.58 | 16.6 |
| ISA 110×110×12 | 110 | 12 | 19.68 | 19.7 |
| ISA 110×110×16 | 110 | 16 | 25.71 | 25.7 |
| ISA 130×130×8 | 130 | 8 | 15.92 | 15.9 |
| ISA 130×130×10 | 130 | 10 | 19.72 | 19.7 |
| ISA 130×130×12 | 130 | 12 | 23.45 | 23.5 |
| ISA 130×130×16 | 130 | 16 | 30.74 | 30.7 |
| ISA 150×150×10 | 150 | 10 | 22.93 | 22.9 |
| ISA 150×150×12 | 150 | 12 | 27.29 | 27.3 |
| ISA 150×150×16 | 150 | 16 | 35.84 | 35.8 |
| ISA 150×150×20 | 150 | 20 | 44.12 | 44.1 |
| ISA 200×200×12 | 200 | 12 | 36.85 | 36.9 |
| ISA 200×200×16 | 200 | 16 | 48.53 | 48.5 |
| ISA 200×200×20 | 200 | 20 | 59.96 | 60.0 |
| ISA 200×200×25 | 200 | 25 | 73.90 | 73.9 |
Amber 1989 figures differ from 2021 by more than rounding. IS 808:2021 prints angle masses to two decimals, and most are slightly higher than the 1989 figures: up to about 6% on the smallest angles (ISA 25×25×4 is 1.48 kg/m against 1.4), and under 2% for 60 mm legs and above. On the smallest sizes, that gap is larger than the IS 1852 tolerance, so check which edition your supplier’s chart uses.
IS 808:1989 or IS 808:2021 — which one to use?
IS 808:2021 is the fourth revision and replaces IS 808:1989. According to its foreword, the 2021 revision merges in the parallel-flange sections of IS 12778:2004, aligns the section axes with IS 800 and adds plastic and torsional section properties. The ISMB, ISMC and ISA designations carry over unchanged.
- ISMC channels: no change in mass or dimensions.
- ISMB beams: same dimensions; masses now printed to two decimals. Only ISMB 175, 350 and 600 move by more than rounding.
- ISA angles: masses recomputed to two decimals, mostly a little higher than 1989.
This page uses the 2021 figures. If a supplier’s chart or a mill test certificate uses the 1989 value, the gap is small, but on a large consignment it adds up. Agree the basis before you price, and invoice on weighed weight.
Chart weight vs actual weight in your billing
The chart gives you a nominal weight to quote from; what leaves the yard is weighed. SteelERP keeps both on every order line (the ordered weight and the actual loaded weight) and bills on the actual, with delivery sub-orders by kg, metre or piece, each with its own challan.
See weight-based billing on sample data
Try the live sandbox: create an order in tonnes, load a different actual weight, and see the challan and bill follow it. Plans from Rs 10,000/month.
Try the Live SandboxISMB, ISMC & ISA weight — FAQs
What is the weight of ISMB 200 per metre?
IS 808:2021 gives 24.17 kg/m for ISMB 200 (200 mm deep, 100 mm flange). IS 808:1989 printed it as 24.2 kg/m. A 6 m piece therefore weighs about 145.02 kg.
What is the weight of ISMC 100 per metre?
9.56 kg/m, the same in IS 808:1989 and IS 808:2021 (100 mm deep, 50 mm flange, 5.0 mm web). Charts that show 9.2 kg/m list a thinner 4.7 mm web, which is not the IS 808 profile.
How do I calculate the weight of a beam, channel or angle?
Multiply the kg/m figure by the length in metres and by the number of pieces. For example, 20 pieces of ISA 50×50×6 at 6 m each weigh 4.49 × 6 × 20 = 538.8 kg. The kg/m figures themselves are the sectional area multiplied by 7.85 g/cm³, the steel density IS 1852 uses for nominal weight.
How much can the actual weight differ from the chart?
IS 1852:1985 allows the weight per metre to vary by ±2.5% for beams and channels (±4% for the old Fe 310-0 grade of IS 1977), ±5% for angles 3 mm thick and +5% / −3% for angles thicker than 3 mm. A 6 m ISMB 300 piece with a nominal weight of 276.12 kg can therefore weigh roughly 269.2 kg to 283.0 kg and still be within tolerance.
Why do different weight charts give different numbers?
Some charts still print IS 808:1989 figures, which differ from IS 808:2021 for a few sizes (ISMB 600 is 123 kg/m in 1989 and 121.00 kg/m in 2021). Others list channel and beam profiles with different web and flange thicknesses from the ones in IS 808. Ask your supplier which edition their chart follows.
Sources
- IS 808:2021
- IS 808:1989
- IS 1852:1985
Figures are nominal values from the standards, for estimating and quoting. They are not a substitute for weighing, and structural design should use the full section properties in IS 808. Page last checked: 11 September 2026.