Rebar Bending Schedule Calculator

Work out rebar bending schedule instantly with clear inputs, formula shown and shareable results.

About Rebar Bending Schedule Calculator

Cutting length is the straight length between covers plus the hook extensions, minus a bend deduction because steel follows the inside of a bend rather than the sharp corner drawn on the schedule. Deductions are conventionally two diameters per 90 degree bend and three for a 180 degree hook.

Formulas

Cutting length

L = (span - 2 x cover) + 2 x hook extension - bend deductions

Weight

kg = d² / 162 x cutting length in metres

Worked example

With the default values below, Rebar Bending Schedule Calculator returns Cutting length of 4,094. Change any input above and every figure here is recalculated in your browser.

Inputs used

Bar diameterminimum 4 mm: 12 mm
Clear span or member lengthminimum 10 mm: 4,000 mm
Cover at each endminimum 0 mm: 25 mm
End treatmentone of 90 degree bend, 8d extension, 135 degree bend, 10d extension, 180 degree hook, 16d extension: 90 degree bend, 8d extension

Results

Cutting length: 4,094 mm
Total hook allowance: 192 mm
Total bend deduction: 48 mm
Weight per bar: 3.639 kg

Step by step

1Values used
2Cutting length
3Weight
4Cutting length= 4,094 mm
5Total hook allowance= 192 mm
6Total bend deduction= 48 mm
7Weight per bar= 3.639 kg

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Preliminary estimate only. Bar bending schedules must follow the detailing code in force and be checked against the structural drawings.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Preliminary estimate only. Bar bending schedules must follow the detailing code in force and be checked against the structural drawings.

Frequently Asked Questions

How is the Rebar Bending Schedule figure worked out?

L = (span - 2 x cover) + 2 x hook extension - bend deductions. Cutting length is the straight length between covers plus the hook extensions, minus a bend deduction because steel follows the inside of a bend rather than the sharp corner drawn on the schedule.

Why does the deduction exist at all?

The scheduled dimensions are outside-to-outside. The bar itself travels a shorter curved path, so cutting to the scheduled sum would leave every bar slightly too long.

What values do I need to enter?

This calculator takes 4 inputs: Bar diameter, Clear span or member length, Cover at each end, End treatment. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.