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Hex Bar Weight Calculator

Updated 8 November 2026Calculated with steel density 7,850 kg/m³How we check

Calculate the weight of hexagonal bars (hex bars) in MS, stainless steel and brass. Enter the size across flats (AF), the length and the quantity.

All results are in kg.

Material

Across flats (AF)

Length

Quantity (pieces)

Rate per kg (₹, optional)

Measure across flats (AF), not across corners.

–Weight of 1 piece

–Total weight

–Weight per meter

–Weight per foot

–Total in tonnes

–Total in pounds

–Paint / galvanizing area

–Estimated cost

Hex Bar Weight Chart

Across flats	MS kg/m	MS per 6 m	SS 304 kg/m	Brass kg/m
8 mm	0.435	2.61	0.440	0.471
10 mm	0.680	4.08	0.687	0.736
12 mm	0.979	5.87	0.989	1.060
13 mm	1.149	6.89	1.161	1.244
16 mm	1.740	10.44	1.758	1.884
17 mm	1.965	11.79	1.985	2.127
19 mm	2.454	14.73	2.479	2.657
20 mm	2.719	16.32	2.747	2.944
22 mm	3.290	19.74	3.324	3.563
24 mm	3.916	23.49	3.956	4.240
25 mm	4.249	25.49	4.292	4.601
27 mm	4.956	29.74	5.006	5.366
30 mm	6.118	36.71	6.181	6.625
32 mm	6.961	41.77	7.032	7.538
36 mm	8.811	52.86	8.900	9.540
41 mm	11.428	68.57	11.544	12.374
46 mm	14.385	86.31	14.532	15.576
50 mm	16.996	101.97	17.169	18.403

Weight (kg/m) = 0.866 × AF × AF × 0.00785 = AF² × 0.0068

AF is the distance across flats in mm. The area of a hexagon is √3 ÷ 2 × AF² = 0.866 × AF².

Example: a 20 mm MS hex bar weighs 0.866 × 400 × 0.00785 = 2.719 kg/m.

Measure across flats (parallel sides), not across corners. Across corners is about 1.155 × AF.

How do I calculate hex bar weight?

Multiply 0.866 × across flats (mm) × across flats (mm) × 0.00785 to get kg per meter.

What is the weight of a 20 mm hex bar?

A 20 mm MS hex bar weighs about 2.719 kg per meter.

What is the weight of a 25 mm hex bar?

A 25 mm MS hex bar weighs about 4.249 kg per meter.

Is a hex bar heavier than a round bar?

Yes. A hex bar has about 10% more steel than a round bar whose diameter equals the across-flats size.