Rebar Weight Calculator
How much steel bar (rebar) weighs in your construction job? A Rebar Weight Calculator is a best tool that helps you figure out.
It works by taking the size (diameter) of the rebar and how long it is, and then it gives you the weight.
You use it when you plan a beam, column or slab so you can buy the right amount of steel. It supports you in budgeting, ordering and avoiding waste.
Why calculate rebar weight in a real-life case
Imagine an engineer is teaching his team. He says: “Let’s say we have five rods of 16 mm diameter and each rod is 6 meters long.” He wants the team to calculate how much those rods weigh before ordering steel.
By doing this, they know how many kg of rebar they need and they avoid paying for too much or having leftover. It’s clear and practical.
How to calculate the values step by step
First, know the formula. One common formula is:
Weight (kg) = (Diameter in mm)² ÷ 162 × Length in metres.
Now apply it:
- Diameter D = 16 mm
- Length L = 6 m
- Unit weight per metre = (16² ÷ 162) = (256 ÷ 162) ≈ 1.58 kg/m (rounded)
- Then total weight = 1.58 kg/m × 6 m = 9.48 kg per rod.
- For 5 rods: 9.48 kg × 5 = 47.4 kg.
So the team now knows they need approximately 47.4 kg of 16 mm rebar for those five rods.
Second, check your units and round properly — small errors matter.
Third, if you have different sizes, repeat the process for each size, then sum up.
Finally, double-check with a calculator or tool: many online calculators let you input diameter, length and quantity.
Bold Trick:
A simple trick is to remember “Diameter² ÷ 162 times Length = Weight in kg” and then multiply by quantity. However, using the calculator speeds it up and cuts mistakes — so always use one when you’re planning big projects.
