Rod Weight Calculator: Rebar kg per Metre

The rod weight formula

Weight per metre (kg) = d² ÷ 162, where d is the rod’s diameter in mm. Per foot it is d² ÷ 532.

The formula comes from the rod’s cross-section (π/4 × d²) and the density of steel (7,850 kg/m³); the exact constant is 162.2. The calculator uses the full formula.

Example: 40 rods of 12 mm, 40 ft each

1. Weight per foot: 12² ÷ 532 = 144 ÷ 532 = about 0.271 kg.
2. Total length: 40 × 40 = 1,600 ft (487.68 m).
3. Total weight: about 432.97 kg, or 0.433 tonne.
4. At ৳1,00,000 a tonne (an example only): 0.433 × 1,00,000 = about ৳43,297.

Rod weight by size

These are theoretical weights; real rods can weigh slightly more or less within the maker’s tolerance.

Before you buy

• Rod prices change and differ by brand and dealer, so none is built in. Enter the price you were quoted.
• Check the weighed weight on the bill and at delivery.
• How much rod you need depends on the design; take lengths and numbers from your engineer’s bar bending schedule.
• To write a Taka amount in words, use Taka Amount in Words; for land, the Land Area Calculator.

How to use the calculator

1. Choose the rod size (diameter) and whether you give lengths in feet or metres.
2. Enter the length of one rod and the number of rods. Bangla digits work.
3. For the cost, enter the price per tonne; otherwise leave it blank.
4. Select Calculate weight to see the total in kg and tonnes, the weight per metre and foot, and the cost.

Sources

• শিক্ষক বাতায়ন: রডের ওজন বের করার নিয়ম (Bangla).
• Nominal weights by size: Infralens: Steel bar weight chart (IS 1786 nominal mass per metre).

Checked on 1 November 2026.