TMT / REBAR · d² ÷ 162.2 · IS 1786 · ASTM A615 · JIS G3112

40mm TMT Bar Weight: Per Metre, Per Foot and Per Bar

WEIGHT PER METRE

9.864 kg/m

PER FOOT

3.007 kg/ft

PER 12 M BAR

118.37 kg

BARS PER TONNE

≈ 8

CROSS-SECTION

1,256.64 mm²

40² ÷ 162.2 = 9.864 kg/m

Constant 162.2 = 10⁶ ÷ (π/4 × 7,850), from mild-steel density 7,850 kg/m³

SOURCE: IS 1786 · ASTM A615 · JIS G3112 · BS 4449 · LAST VERIFIED 18 JUL 2026

TMT bar weight, all standard sizes (12 m bars)

Size	kg/m	kg per 12 m bar	Bars/tonne
6mm	0.222	2.66	≈ 375
8mm	0.395	4.74	≈ 211
10mm	0.617	7.40	≈ 135
12mm	0.888	10.66	≈ 93
16mm	1.578	18.94	≈ 52
20mm	2.466	29.59	≈ 33
25mm	3.853	46.24	≈ 21
28mm	4.834	58.01	≈ 17
32mm	6.316	75.79	≈ 13
36mm	7.990	95.88	≈ 10
40mm ●	9.864	118.37	≈ 8

A 40mm TMT bar weighs 9.864 kg per metre, calculated with the d²/162.2 formula: (40 × 40) ÷ 162.2 = 9.864 kg/m.

A standard 12 m length of 40mm TMT weighs 118.37 kg (9.864 kg/m × 12 m).

Approximately 8 standard 12 m bars of 40mm TMT make one tonne (1,000 ÷ 118.37 kg per bar). Actual counts vary with rolling tolerance under IS 1786.