Metal Weight Calculator
Calculate the weight of steel, aluminium, copper and brass bars, tubes and sheets in kg, with cost per kg for your project.
Weight
2.47 kg
2.47 kg per metre
Estimated cost
₹222
Weight = volume × density. A 20 mm steel bar runs about 2.47 kg per metre; market rates add cutting and transport on top.
Last updated: August 2026
How this calculator is verified
Checked by True Calculator automated test suite on
- Formula verified against a published worked example in the automated test suite
- Edge cases (zero, negative, boundary and unit-mismatch inputs) covered by unit tests
The full verification method is on our how we verify page. Found an error? Tell us and we will re-check it.
When to Use This Calculator
Steel and copper are sold by weight in India, so every fabrication quote starts with a weight estimate. A structural contractor ordering MS angles and rounds for a shed in Pune, a plumber pricing copper pipes for a Mumbai renovation, or an aluminium fabricator quoting window frames in Chennai all multiply volume by density to arrive at the bill. The same numbers plan transport, since weight decides the lorry and the crane. With the per-kg market rate added, the calculator goes one step further and estimates the material cost on the spot, so quotes and purchases agree before the material reaches the site.
How to Use This Calculator
- Step 1: Choose the shape — round bar, square bar, flat bar, tube or sheet.
- Step 2: Choose the material — steel, stainless, aluminium, copper or brass.
- Step 3: Enter the dimensions in mm and the length in metres.
- Step 4: Add the ₹ per kg rate to see the material cost alongside the weight.
Worked Example
A fabricator in Faridabad needs the weight of a 20 mm diameter MS round bar, 1 metre long. Its volume is π × (0.01)² × 1 = 0.000314 m³, and steel at 7,850 kg/m³ makes the weight 0.000314 × 7850 = 2.47 kg — matching the familiar d²/162 thumb rule for steel. At the day's market rate of ₹90 per kg, that one metre costs about ₹222. A 2 mm × 500 mm copper sheet, 1 metre long, weighs 8.96 kg, and at copper's higher market price the difference in the bill is substantial.
Tips and Common Mistakes
- •Tip 1: The d²/162 rule gives kg per metre for round steel bars — check it against this calculator's answer.
- •Tip 2: For tubes, the wall thickness is what carries the weight; a thicker wall adds rapidly to the kg.
- •Tip 3: Steel and copper prices move daily in Indian markets — enter today's quote for an accurate cost.
- ✗Mistake 1: Entering all dimensions in millimetres except the length, which must be in metres.
- ✗Mistake 2: Using the outer diameter of a tube as if it were solid — hollow sections weigh far less.
Frequently Asked Questions
How is the weight of a steel bar calculated?
Weight = volume × density. A 20 mm diameter steel bar of 1 metre has volume π × (0.01 m)² × 1 m and weighs about 2.47 kg — the same as the common d²/162 thumb rule.
What densities does the calculator use?
Steel 7,850 kg/m³, stainless steel 7,930, aluminium 2,700, copper 8,960 and brass 8,550 kg/m³ — the standard textbook values used for structural and fabricator estimates.
Why do I need the weight of a metal piece?
Steel and copper are billed per kilogram in Indian markets, so fabricators and contractors estimate weight first to quote the material cost and plan transport.
Can I calculate the cost too?
Yes. Enter the current per-kg rate you are quoted — market steel rates fluctuate — and the calculator multiplies it by the weight to give the material cost before cutting and labour.
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