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TMT bar weightcalculator
Know your steel in kilograms tonnes bars bundles
Pick a bar size, enter the length and number of bars, and get the weight in kg and tonnes. Working backwards from a quantity? Enter your tonnage and see how many bars to order. Then send the whole list to our sales desk on WhatsApp.
D² ÷ 162 formula8 to 32 mmkg · tonnes · barsFe 500D · IS 1786
Size, length, bars. Done.
Results update as you type. Switch to tonnage mode to work backwards from a quantity, and add every size your site needs to one order list.
Standard TMT bars come in 12 m (about 39.4 ft).
Total weight
Weights use π/4 × D² × 7,850 kg/m³, the basis of the nominal masses in IS 1786 (the familiar shortcut is D² ÷ 162). They are estimates for planning and BOQs; the weighed weight of a lot can differ slightly within IS 1786 rolling tolerance. *Bundles use typical market bundling and may vary by size and dealer.
TMT bar weight chart
Nominal unit weights, worked out from π/4 × D² × 7,850 kg/m³ as in IS 1786. Per-bar weights are for the standard 12 m length.
8 mm
4.74 kg per 12 m bar
≈ 211 bars per tonne
10 mm
7.40 kg per 12 m bar
≈ 135 bars per tonne
12 mm
10.65 kg per 12 m bar
≈ 94 bars per tonne
16 mm
18.94 kg per 12 m bar
≈ 53 bars per tonne
20 mm
29.59 kg per 12 m bar
≈ 34 bars per tonne
25 mm
46.24 kg per 12 m bar
≈ 22 bars per tonne
28 mm
58.00 kg per 12 m bar
≈ 17 bars per tonne
32 mm
75.76 kg per 12 m bar
≈ 13 bars per tonne
Where D² ÷ 162 comes from
A TMT bar is a steel cylinder. Its weight per metre is the cross-section area, π × D² ÷ 4, multiplied by the density of steel, 7,850 kg/m³. With D in millimetres that works out to D² ÷ 162.2, which the trade rounds to D² ÷ 162.
The calculator uses the exact figure, so its results line up with the nominal weights in IS 1786. Multiply by the bar length and the number of bars, and you have the weight of your order.
W in kg per metre · D = bar diameter in mm
Example, 12 mm: 12 × 12 ÷ 162.2 = 0.888 kg/m
× 12 m length = 10.65 kg per bar
Three steps to a site order
Pick your bar size
Tap the diameter you need, from 8 mm to 32 mm. The result panel shows the cross-section and unit weight straight away.
Enter length and bars, or a tonnage
Use metres or feet. In tonnage mode the calculator rounds up to whole bars, so you never order short.
Add to your list and send
Add every size your site needs, add the site city and send the list to our sales desk on WhatsApp for rate and availability.
TMT weight, answered.
Still unsure about sizes or quantities? Our sales desk on 0771-2443238 will help you plan the steel for your site.
Still have a question?
Our sales desk helps you pick the right grade, size and quantity for your site.
How do I calculate the weight of a TMT bar?
Weight in kg per metre is D² ÷ 162, where D is the bar diameter in mm. Multiply by the bar length in metres and by the number of bars. Example: 10 bars of 16 mm, 12 m long: 16 × 16 ÷ 162 × 12 × 10 ≈ 189.6 kg. The calculator uses the exact factor of 162.2, which gives 189.4 kg.
Why is the formula D² divided by 162?
Weight is volume times density. One metre of bar has a cross-section of π × D² ÷ 4 square millimetres. Multiply by the density of steel, 7,850 kg/m³, convert the units, and you get D² ÷ 162.2 kg per metre. The trade rounds it to 162.
What is the weight of a 12 mm TMT bar?
A 12 mm bar weighs 0.888 kg per metre. A standard 12 m bar weighs about 10.65 kg, so roughly 94 bars make a tonne.
How many TMT bars are there in one tonne?
It depends on the size. With 12 m bars: 8 mm about 211, 10 mm about 135, 12 mm about 94, 16 mm about 53, 20 mm about 34, 25 mm about 22, 28 mm about 17 and 32 mm about 13. Use “Bars for my tonnage” for your exact quantity.
Will my delivered weight match the calculator exactly?
Close, but not exact. The calculator uses nominal weights. IS 1786 allows a small rolling tolerance on mass per metre, so a weighed lot can be a little heavier or lighter. Use the figures for estimates, BOQs and site planning.
What is the standard length of a TMT bar?
TMT bars are usually supplied in 12 m lengths. If you cut bars on site, enter the cut length in metres or feet and the calculator does the rest.
How do I order Singhal 500D TMT bars?
Add each size to your order list, add your site city and tap “Send order on WhatsApp”. Our sales desk replies with rate and availability. You can also call 0771-2443238 or email info@singhalsteel.com.