Steel Bar Weight Calculator
Estimate steel reinforcement bar weight with the standard D2/162.2 formula. Pick a bar diameter, enter the length per bar and the quantity to get weight per meter, per-bar weight, total kg and total tons.
Bar details
Weight results
| Step | Calculation | Result |
|---|---|---|
| Weight per meter | - | - |
| One bar | - | - |
| All bars | - | - |
How to use
- Choose a bar diameter preset (8, 10, 12, 16, 20, 25 or 32 mm) or type a custom diameter.
- Enter the length of each bar in meters — a standard full bar is 12 meters.
- Enter how many bars you need, then click Calculate Weight.
- Read the weight per meter, per-bar weight, total kilograms and total tons, with the full step-by-step math.
Tips
- Common residential slabs in Pakistan use 12 mm bars for main steel and 10 mm for distribution bars.
- For lap lengths and cutting schedules, calculate the effective bar length first, then enter it above.
- Estimate concrete and mortar quantities with the Cement Sand Calculator or the Concrete Calculator alongside this tool.
- All calculations happen in your browser; nothing is uploaded.
Frequently Asked Questions (FAQ)
What formula does the Steel Bar Weight Calculator use?
It uses the standard construction formula: weight per meter (kg/m) = D squared divided by 162.2, where D is the nominal bar diameter in millimetres. Total weight is then weight per meter multiplied by bar length and the number of bars.
What inputs does the calculator need?
You need three inputs: the bar diameter (pick a preset of 8, 10, 12, 16, 20, 25 or 32 mm, or type a custom value), the length of each bar in meters, and the number of bars.
What results does the tool show?
It shows the weight per meter in kg, the weight of one bar, the total weight in kilograms, and the total weight in metric tons. A breakdown table lists the values step by step so you can check the math.
Why is 162.2 used in the formula?
The number 162.2 comes from the density of steel (7850 kg per cubic meter) combined with unit conversions. It is the accepted constant in construction practice for estimating reinforcement bar weight from diameter alone.
Are these weights exact enough for a construction estimate?
They are close estimates based on nominal diameter, good for budgeting and material planning. Real bars can vary slightly in weight, so confirm final quantities with your supplier before placing a structural order.