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Rebar Calculator — Slab Grid Bars, Length, Stock Pieces, Weight & Cost

Editable live calculator

Change any input — the result updates immediately

No hidden assumptions. Inputs, units and the working stay visible so you can check the calculation.

Slab length (ft) Slab width (ft) Edge cover to bar centerline (in) Grid spacing on center (in) Lap / waste allowance (%) Stock bar length (ft) Bar weight (lb/ft, optional) Enter the published weight for the selected bar size.Price per stock bar (optional)

Calculated result

26 × 20 ft stock bars

12 bars running 19.5 ft lengthwise

20 bars running 11.5 ft widthwise

Raw grid length: 464 ft

Order length with 10% allowance: 510.4 ft

Purchased stock length: 520 ft

Weight not calculated — enter lb/ft for the selected bar.

Optional stock-bar price not entered.

Show the working

1. Clear slab dimensions inside edge cover: 19.5 × 11.5 ft.
2. Lengthwise line count = floor(138 in ÷ 12 in) + 1 = 12; widthwise count = 20.
3. Raw bar length = 12 × 19.5 + 20 × 11.5 = 464 ft.
4. Apply 10% allowance and divide by 20 ft stock = 26 pieces.

Quantity takeoff only. Spacing, bar size, cover, development and splice requirements must come from the reinforcement design; this calculator does not design or certify reinforcement.

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