Rebar Grid Calculator

Grid Spacing (inches) sets how far apart the bars run in both directions across the floor and walls -- halving it (say from 12 in to 6 in on center) roughly doubles how many bars fit across the same span, in both the floor grid and the wall grid at once. Total Rebar (linear ft) moves inversely to Grid Spacing (inches): tighter spacing means more total footage, wider spacing means less, unlike every other input on this calculator, which moves the total the same direction it moves.

No -- Rebar Size only changes Total Weight (lbs) and Total Tons through its weight-per-foot figure (0.376 lbs/ft for #3 up to 1.043 lbs/ft for #5, roughly a 3x spread). Total Rebar (linear ft) and 20-ft Sticks Needed are purely geometric, driven by pool dimensions and Grid Spacing (inches) -- the same grid laid out in #3 or #5 bar needs the identical linear footage, just at very different weights and, in practice, very different costs.

A single multiplier applied to the raw floor-plus-wall linear footage: 1 plus Lap Splice Length (in) divided by 240. At the default 24 in splice length, that's a 10% addition; at the maximum 48 in, it's 20%. It represents the extra length consumed wherever two bars overlap and get tied together at a joint -- it doesn't add more bars to the grid, just more length to the bars the grid already calls for.

Both. Wall Rebar (linear ft) is built from the wall grid's own horizontal and vertical bar counts, and the wall's horizontal bars run the pool's full perimeter (2 x (length + width)) -- so Pool Width (ft) affects both Floor Rebar (linear ft), through the floor's own grid, and Wall Rebar (linear ft), through the perimeter the wall grid wraps around. Neither dimension is isolated to just one of the two rebar totals.