MCPCalc

Rebar Spacing Calculator

Calculate rebar quantity, total linear feet, and weight for a slab.

Scratchpad (not saved)

ft
ft
in

Center-to-center bar spacing

What This Calculator Does

Calculate rebar quantity, total linear feet, and weight for a slab.

It combines Slab Length, Slab Width, Bar Size, Spacing to estimate Total Rebar Bars, Total Linear Feet, Total Weight.

Formula & Method

Bars each direction are N_L=\left\lfloor\frac{W}{s}\right\rfloor+1,\;N_W=\left\lfloor\frac{L}{s}\right\rfloor+1 where s is spacing in feet. Total linear feet: LF=N_L\cdot L+N_W\cdot W. Weight: Weight=LF\cdot lb_per_ft.

Notation used in the formulas: R = Total Rebar Bars; x_{1} = Slab Length; x_{2} = Slab Width; x_{3} = Bar Size; x_{4} = Spacing.

Method summary: inputs are normalized to consistent units, core equations are evaluated, then secondary values are derived and rounded for display.

Use this calculator for quick scenario analysis. Start with baseline values, change one driver at a time, and compare how sensitive the results are to each input shown above.

Inputs Used

  • Slab Length: Used directly in the calculation.
  • Slab Width: Used directly in the calculation.
  • Bar Size: Used directly in the calculation.
  • Spacing: Center-to-center bar spacing

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