Round bar, TMT, square & hex bar weight chart

Weight of steel bar per metre. Round and TMT bar: D² ÷ 162 kg/m with D in mm. Square: 0.00785 × a². Hex across flats: 0.0068 × s².

Size	Round kg/m	Round 12 m length kg	Square kg/m	Hex (A/F) kg/m	SS 304 round kg/m
6 mm	0.222	2.66	0.283	0.245	0.224
8 mm	0.395	4.73	0.502	0.435	0.399
10 mm	0.617	7.40	0.785	0.680	0.623
12 mm	0.888	10.65	1.130	0.979	0.897
16 mm	1.578	18.94	2.010	1.740	1.594
20 mm	2.466	29.59	3.140	2.719	2.491
22 mm	2.984	35.81	3.799	3.290	3.014
25 mm	3.853	46.24	4.906	4.249	3.893
28 mm	4.834	58.00	6.154	5.330	4.883
32 mm	6.313	75.76	8.038	6.961	6.378
36 mm	7.990	95.88	10.174	8.810	8.072
40 mm	9.864	118.37	12.560	10.877	9.965
45 mm	12.485	149.82	15.896	13.766	12.612
50 mm	15.413	184.96	19.625	16.995	15.570
56 mm	19.334	232.01	24.618	21.319	19.531
60 mm	22.195	266.34	28.260	24.473	22.421
65 mm	26.048	312.58	33.166	28.722	26.314
70 mm	30.210	362.52	38.465	33.310	30.517
75 mm	34.679	416.15	44.156	38.239	35.033
80 mm	39.457	473.49	50.240	43.507	39.860
90 mm	49.938	599.26	63.585	55.064	50.447
100 mm	61.652	739.83	78.500	67.980	62.281
110 mm	74.599	895.19	94.985	82.256	75.360
120 mm	88.779	1065.35	113.040	97.891	89.684
125 mm	96.332	1155.98	122.656	106.219	97.313
130 mm	104.192	1250.31	132.665	114.886	105.254
140 mm	120.838	1450.06	153.860	133.241	122.070
150 mm	138.718	1664.61	176.625	152.955	140.131
160 mm	157.830	1893.96	200.960	174.029	159.438
180 mm	199.753	2397.04	254.340	220.255	201.789
200 mm	246.609	2959.31	314.000	271.920	249.122
220 mm	298.397	3580.76	379.940	329.023	301.438
250 mm	385.327	4623.92	490.625	424.875	389.254
300 mm	554.871	6658.45	706.500	611.820	560.525

Frequently asked questions

What is the weight of a 12 mm TMT bar?

0.888 kg/m, or about 10.65 kg per 12 m bar.

Why is the formula D²/162?

π/4 × D² × 7850 kg/m³ ÷ 10⁶ = D²/162.2 for D in mm.

How many 16 mm bars make a tonne?

About 53 bars of 12 m.

Last updated 2026-11-02