How the calculation works
Bars in each direction = round up (usable perpendicular span ÷ maximum spacing) + 1. Sum the lengths and apply your cutting/lap allowance.
A worked example
For a 10 × 10 ft area, zero edge cover and 12 in maximum spacing, 11 bars run in each direction: 220 linear feet before allowance.
What to check before using the result
- This counts a supplied design; it does not choose bar size, cover or spacing.
- Stock-length equivalents are not an optimized cutting or lap-splice plan.
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Method prepared 2026-10-21. See our calculation and editorial methods. Spotted a problem? Tell us about it.