Rebar Weight Calculator
Find the weight per metre, per bar and in total for steel reinforcement bars from the bar diameter and length.
Recent
Formula
How the calculation works
Enter the bar diameter in millimetres, the length of each bar in metres and the number of bars.
The tool squares the diameter and divides by 162, the standard formula that gives the weight in kilograms per metre for steel rebar.
It multiplies that unit weight by the bar length and again by the number of bars to show the total weight to order.
Common mistakes
- Using the nominal diameter after the bar has rusted or been deformed heavily, because the true weight then falls below the standard formula.
- Mixing millimetres and metres in the same field, which throws the weight off by a factor of a thousand and ruins the order quantity.
When to use it
- Use it to order the right quantity of steel by weight, since reinforcement is sold by kilogram rather than by length.
- Use it to check the steel weight a contractor quotes against the bar schedule before you pay.
Worked example
A 12 mm bar gives 144 divided by 162, which is 0.889 kg per metre. A 12 metre bar then weighs 10.67 kg, and 10 such bars weigh 106.67 kg in total.
Common questions
Why is the rebar formula divided by 162?
It comes from converting the steel density of 7850 kg per cubic metre into a formula using the bar diameter in millimetres, giving kilograms per metre directly.
Related tools
-
Brick Calculator
Estimate how many bricks a wall needs from its length, height and thickness, allowing for mortar joints and wastage.
-
Building Material Estimator for Cement, Rod and Sand
Gives a quick estimate of cement bags, steel rods and sand needed for a given volume of concrete, using per-cubic-metre rates you can adjust.
-
Home Construction Cost Calculator (Bangladesh)
Multiplies floor area by the cost per square foot and the number of floors to estimate total building construction cost in Bangladesh.
-
House Rent and Advance Calculator
Adds the monthly rent and service charge and works out the advance you pay up front when renting a flat.
-
Land Registration Cost Calculator (Bangladesh)
Adds stamp duty, registration fee and source tax on a property value to estimate the total cost of registering a land deed in Bangladesh.
-
Land Unit Converter (Bangladesh)
Converts land area between the units used in Bangladesh, including square feet, square metres, katha, bigha, acre and decimal.
-
Plaster Calculator
Estimates the cement, sand and water needed to plaster a wall from the area, thickness and mix ratio, including a wastage allowance.
-
Plot Price Calculator
Find the total price of a plot from its size in katha or shotangsho and the rate per unit.