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Rebar Bars per Tonne and Order Quantity Calculator
Orders may be specified in tonnes while a yard counts individual bars. Rounding in the correct direction matters: this tool shows both whole bars within a weight limit and bars needed to meet a minimum target.
Your dimensions
Counts use theoretical mass. Confirm actual mill weight, weighbridge results, bundle quantities, bends, cuts and site waste before finalizing an order.
Calculation results
- Bars to meet target weight
- 53
- Whole bars within target weight
- 52
- Weight per stock length
- 18.95kg
- Weight of required bars
- 1,004.57kg
How to use this tool
- Enter target tonnage. One metric tonne equals 1000 kg.
- Set nominal rebar diameter in millimetres and stock length in metres.
- Use the within-target count for a weight ceiling. Use the required count and resulting order weight to meet a minimum tonnage.
Calculation formula
kg/bar = 0.00617 × d² (mm) × L (m); N = tonnes × 1000 ÷ kg/bar
Bar mass uses the same approximate 0.00617 × diameter squared × length relationship as the site’s rebar weight calculator. Divide target mass by bar mass, rounding down for a weight ceiling and up for minimum supply.
Worked example
For one tonne of 16 mm rebar in 12 m lengths, theoretical bar mass is 18.95424 kg. There are 52 whole bars within one tonne; meeting at least one tonne requires 53 bars weighing approximately 1,004.57 kg.
Frequently asked questions
Why are there two different bar counts?
Bars are indivisible units. A weight ceiling requires rounding down; a minimum required weight requires rounding up. The latter produces a slightly heavier order when the target is not an exact multiple of bar mass.
Can I estimate the number of bars in a bundle?
Yes, if you know its net mass and bar dimensions. Convert the bundle mass to tonnes and enter it. The result remains theoretical; mill packaging and actual bar mass can change the count.
Continue planning your order
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Sources and calculation basis
Industry references for density and planning tools; this calculator’s method and limitations are explained above.
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