Rebar Area and Weight Chart (Ø6 to Ø40)

Rebar weight and area chart for Ø6 to Ø40: kg/m, area of 1 to 10 bars and a spacing matrix in cm²/m. Theoretical values with a labelled drawing.

This is a preliminary quantity table for theoretical area and mass only. Strength, spacing, anchorage, laps and manufacturing tolerances are not checked. A qualified engineer must complete the final design to the applicable standard.

Dimension drawing and symbols

d: Diameter mm
s: Bar spacing cm

d is the nominal bar diameter without ribs. s is the spacing between bar centres.

Visible rows: 34

Area by number of bars

Rebar area and weight by number of bars
ddia.mm	masskg/m	1	2	3	4	5	6	7	8	9	10
		Total area by number of bars, mm²
6	0.2220	28.27	56.55	84.82	113.10	141.37	169.65	197.92	226.19	254.47	282.74
8	0.3946	50.27	100.53	150.80	201.06	251.33	301.59	351.86	402.12	452.39	502.65
10	0.6165	78.54	157.08	235.62	314.16	392.70	471.24	549.78	628.32	706.86	785.40
12	0.8878	113.10	226.19	339.29	452.39	565.49	678.58	791.68	904.78	1017.88	1130.97
14	1.2084	153.94	307.88	461.81	615.75	769.69	923.63	1077.57	1231.50	1385.44	1539.38
16	1.5783	201.06	402.12	603.19	804.25	1005.31	1206.37	1407.43	1608.50	1809.56	2010.62
18	1.9976	254.47	508.94	763.41	1017.88	1272.35	1526.81	1781.28	2035.75	2290.22	2544.69
20	2.4662	314.16	628.32	942.48	1256.64	1570.80	1884.96	2199.11	2513.27	2827.43	3141.59
22	2.9840	380.13	760.27	1140.40	1520.53	1900.66	2280.80	2660.93	3041.06	3421.19	3801.33
24	3.5513	452.39	904.78	1357.17	1809.56	2261.95	2714.34	3166.73	3619.11	4071.50	4523.89
25	3.8534	490.87	981.75	1472.62	1963.50	2454.37	2945.24	3436.12	3926.99	4417.86	4908.74
26	4.1678	530.93	1061.86	1592.79	2123.72	2654.65	3185.57	3716.50	4247.43	4778.36	5309.29
28	4.8337	615.75	1231.50	1847.26	2463.01	3078.76	3694.51	4310.27	4926.02	5541.77	6157.52
30	5.5488	706.86	1413.72	2120.58	2827.43	3534.29	4241.15	4948.01	5654.87	6361.73	7068.58
32	6.3133	804.25	1608.50	2412.74	3216.99	4021.24	4825.49	5629.73	6433.98	7238.23	8042.48
36	7.9903	1017.88	2035.75	3053.63	4071.50	5089.38	6107.26	7125.13	8143.01	9160.88	10178.76
40	9.8646	1256.64	2513.27	3769.91	5026.55	6283.19	7539.82	8796.46	10053.10	11309.73	12566.37

Area per metre by spacing

Area per metre by spacing
ddia.mm	5cm²/m	7.5cm²/m	10cm²/m	12.5cm²/m	15cm²/m	17.5cm²/m	20cm²/m	25cm²/m	30cm²/m
	Bar spacing s, cm
6	5.65	3.77	2.83	2.26	1.88	1.62	1.41	1.13	0.94
8	10.05	6.70	5.03	4.02	3.35	2.87	2.51	2.01	1.68
10	15.71	10.47	7.85	6.28	5.24	4.49	3.93	3.14	2.62
12	22.62	15.08	11.31	9.05	7.54	6.46	5.65	4.52	3.77
14	30.79	20.53	15.39	12.32	10.26	8.80	7.70	6.16	5.13
16	40.21	26.81	20.11	16.08	13.40	11.49	10.05	8.04	6.70
18	50.89	33.93	25.45	20.36	16.96	14.54	12.72	10.18	8.48
20	62.83	41.89	31.42	25.13	20.94	17.95	15.71	12.57	10.47
22	76.03	50.68	38.01	30.41	25.34	21.72	19.01	15.21	12.67
24	90.48	60.32	45.24	36.19	30.16	25.85	22.62	18.10	15.08
25	98.17	65.45	49.09	39.27	32.72	28.05	24.54	19.63	16.36
26	106.19	70.79	53.09	42.47	35.40	30.34	26.55	21.24	17.70
28	123.15	82.10	61.58	49.26	41.05	35.19	30.79	24.63	20.53
30	141.37	94.25	70.69	56.55	47.12	40.39	35.34	28.27	23.56
32	160.85	107.23	80.42	64.34	53.62	45.96	40.21	32.17	26.81
36	203.58	135.72	101.79	81.43	67.86	58.16	50.89	40.72	33.93
40	251.33	167.55	125.66	100.53	83.78	71.81	62.83	50.27	41.89

Quick answers

Ø8 rebar: mass 0.3946 kg/m, area 50.27 mm², 3.35 cm²/m at 15 cm spacing. View in table
Ø10 rebar: mass 0.6165 kg/m, area 78.54 mm², 5.24 cm²/m at 15 cm spacing. View in table
Ø12 rebar: mass 0.8878 kg/m, area 113.1 mm², 7.54 cm²/m at 15 cm spacing. View in table
Ø14 rebar: mass 1.2084 kg/m, area 153.94 mm², 10.26 cm²/m at 15 cm spacing. View in table
Ø16 rebar: mass 1.5783 kg/m, area 201.06 mm², 13.4 cm²/m at 15 cm spacing. View in table
Ø20 rebar: mass 2.4662 kg/m, area 314.16 mm², 20.94 cm²/m at 15 cm spacing. View in table
Ø25 rebar: mass 3.8534 kg/m, area 490.87 mm², 32.72 cm²/m at 15 cm spacing. View in table
Ø32 rebar: mass 6.3133 kg/m, area 804.25 mm², 53.62 cm²/m at 15 cm spacing. View in table

Conditions and notes

Theoretical circular section. Assumed steel density is 7850 kg/m³.

The spacing matrix gives the area per metre width: as = (π d²/4) / s. For Ø10 at s = 15 cm, 78.54 mm² / 0.15 m = 523.6 mm²/m, which is 5.24 cm²/m.

Nominal diameter gives A = πd²/4 and m = 7850A. Diameter is in metres, area is stored in m² and mass per metre in kg/m. A 10 mm bar has an area of 25π mm². Multiply by the number of bars for their total area. The diameter grid does not define a preferred or commercially available series.

Sources

This table is for preliminary reference. Check the applicable standard and product conditions before use.

Source 1. P080:1990. Accessed: 2026-10-16

Data version: 2026-10-16