TMT Bar Weight Chart 2026 — Every Size, Weight Per Metre, Per Piece & Per Bundle

Author : Arun Plus TMT | Published On : 07 Aug 2026

Introduction: Why Getting Steel Weight Right Can Save Lakhs

Every RCC construction project begins with one critical calculation: how much steel do I need? Underestimate, and you'll face mid-construction procurement delays and price-spike exposure. Overestimate, and you've locked up capital in idle inventory. The foundation of every accurate steel estimate is the TMT bar weight chart.

This guide gives you the most comprehensive, IS 1786-aligned TMT bar weight reference available, covering every standard diameter from 6mm to 40mm, with weights per metre, per standard 40-foot rod, per bundle, and per metric tonne. Before your next project briefing, make sure to go through this guide.

TMT Bar Weight Chart — All Standard Sizes (IS 1786:2008)

The theoretical weight per metre for any circular steel bar is calculated using the standard formula:

Dia. (mm)	Wt./metre (kg)	Wt./40ft Rod (kg)	Rods per 100 kg	Wt./Bundle (kg)*	Rods/Bundle*	Typical Use
6 mm	0.222	2.707	36.9	~54	~20	Distribution steel, light stirrups
8 mm	0.395	4.819	20.7	~48	10	Slabs, lintels, stirrups, ties
10 mm	0.617	7.527	13.3	~75	~10	Slabs (main reinforcement), secondary beams, stirrups
12 mm	0.888	10.834	9.2	~108	~10	Slabs (main reinforcement), beams, small columns
16 mm	1.578	19.276	5.2	~96	~5	Columns, beams, retaining walls
20 mm	2.470	30.134	3.3	~120	~4	Heavy columns, foundations
25 mm	3.853	46.97	2.1	~141	~3	Pile caps, bridge beams
28 mm	4.834	59.38	1.7	~118	~2	Heavy infrastructure works
32 mm	6.313	76.982	1.3	~154	~2	Flyovers, dams, marine structures
36 mm	7.990	98.08	1.0	~196	~2	Large piles, heavy engineering structures

How to Calculate TMT Bar Quantity for Any RCC Structure

Step 1: Get the Structural Drawing

Obtain the BIS-compliant structural drawing from your licensed structural engineer. This shows bar diameters, spacing, and lengths for every structural member (columns, beams, slabs, footings, stirrups).

Step 2: Calculate Bar Length for Each Member

For a rectangular slab: Main bars = (Slab length ÷ bar spacing + 1) × slab width + 2 × cover lap allowance. Distribution bars = (Slab width ÷ bar spacing + 1) × slab length + 2 × cover lap allowance.

Step 3: Convert Length to Weight

Total length (m) × Weight per metre (from the chart above) = Total weight in kg. Add 5% for lapping, bending, and cutting wastage.

Step 4: Convert Weight to Number of Rods

Total weight in kg ÷ weight per 40ft rod = Number of rods required. Round up to the nearest whole number.

TMT Bar Weight Per Piece — Quick Reference for Procurement

Diameter	Weight of 1 Rod (40ft)	Approx. Rods in 1 Tonne
8 mm	4.819 kg	207 rods
10 mm	7.527 kg	133 rods
12 mm	10.834 kg	92 rods
16 mm	19.276 kg	52 rods
20 mm	30.134 kg	33 rods
25 mm	46.97 kg	21 rods
32 mm	76.982 kg	13 rods