Rebar quantity and stock planner
Turn a specified rectangular reinforcement layout into bar-piece counts and a transparent stock-cutting estimate. Enter the cut lengths, spacing, stock length and allowance from your reviewed project information, then inspect the quantities before exporting.
Start with the specified layout
This tool calculates quantities for a rectangular grid with identical layers. It does not choose bar sizes, cover, spacing, strength or structural requirements. Use the net bar cut lengths after the clearances already specified in the approved project documents. If layers differ, estimate them separately.
Enter the specified layout
The starting values are fictional. Inputs remain in this browser session and are not automatically saved or transmitted. Export the reviewed CSV to keep a copy.
How to use the planner
- Choose feet or meters and enter the net cut length in each direction.
- Enter the maximum spacing in each direction from the specified layout. The planner includes a bar at both end positions and distributes the pieces equally between them.
- Enter a stock length at least as long as each required cut. Spliced runs are outside this planner’s scope.
- Enter the number of identical layers and any extra-stock allowance you choose.
- Calculate, review the implied spacing and separate-direction cutting counts, and export the reviewed result.
What the quantities mean
For each layer, the number of bars running in the X direction is the rounded-up value of Y length divided by Y spacing, plus one. The number running in Y is the rounded-up value of X length divided by X spacing, plus one. Multiply those counts by the number of identical layers.
Net length is the sum of the required bar-piece lengths. Stock requirements are calculated separately by direction: divide stock length by the required cut length, round down to whole cuts, then round the required stock count up. Add both directional stock counts before applying the extra-stock percentage and rounding up again.
The planner does not combine offcuts across directions. A reviewed cutting plan may use fewer stock bars. Dividing net length by stock length alone can understate the stock needed when leftover lengths cannot make another required piece.
Worked example
For a specified 20-by-10-foot layout with maximum spacing of 2 feet in each direction, one identical layer and 20-foot stock, the planner produces 6 bars running in X and 11 running in Y: 230 feet of net bar length. Separate-direction cutting requires 12 stock bars. An entered 10% extra-stock allowance increases the order quantity to 14 stock bars.
For a 7-by-7-foot layout with 7-foot spacing and 10-foot stock, 28 feet of net bar length still requires four stock bars. Each 7-foot piece needs its own 10-foot stock bar under the stated cutting rule.
Check before ordering
Confirm the approved layout, cut lengths, number of layers, supplier stock length and the treatment of waste or additional pieces. The tool rejects a run longer than the available stock; it does not calculate laps, splices, hooks or bends. The entered allowance is a planning choice, not a recommended engineering factor.
All lengths use the selected unit. Switching units converts entered lengths using exactly 1 foot = 0.3048 meters. Calculations retain precision and displayed lengths use up to three decimal places. CSV exports the reviewed values. Inputs remain local to the browser session and are not automatically saved.