Rod Quantity Calculator
Estimate how many steel bars a concrete pour needs from its volume, a steel ratio, the bar diameter and length, and see the total weight and cost.
Enter your numbers
Example: 12.5
Example: 95
Example: 12
Example: 12
Example: 92
Recent
Formula
How the calculation works
The steel needed is estimated from the concrete volume times a steel ratio in kilograms per cubic metre.
Each bar's weight comes from the diameter squared over 162 times its length, the standard unit weight formula.
Dividing the total steel by one bar's weight gives the bar count, rounded up because you cannot buy part of a bar.
Common mistakes
- Forgetting to round the bar count up, which leaves the order short and forces a costly second delivery.
When to use it
- Use it when ordering reinforcement for a slab or column so the steel order matches the concrete pour.
Worked example
A 12.5 cubic metre pour at 95 kg per cubic metre with 12 mm bars of 12 m at 92 per kg gives 1,187.5 kg of steel, 10.67 kg per bar, 112 bars and a cost of 109,250.
Common questions
Why is the bar count rounded up?
Steel is sold in whole bars, so the count is rounded up to make sure the order covers the full requirement.
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