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Receptacle Spacing and Coverage Calculator

Generate positions on actual eligible wall spans, then check measured receptacle coordinates for uncovered gaps using a documented reach rule.

Use this result well

Inputs that matter
Eligible spaces and spacing rule, Chosen maximum horizontal reach (ft), Continuous eligible spans, Sources and assumptions, and 1 more
Output to expect
Receptacle layout by eligible span, Check actual receptacle coverage
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Receptacle layout by eligible span

Create a centered minimum-count geometric layout on each supplied continuous eligible span. Distances follow the wall line and each span has two endpoints. Specify actual excluded openings as breaks instead of subtracting an assumed door width from total perimeter. Check furniture, access, mounting and placement restrictions on the real plan.

For each span, n = ceil(length / (2 × reach)); positions = length × (2j + 1) / (2n), j = 0…n−1.

Check actual receptacle coverage

Check a measured or proposed set of receptacle coordinates on each eligible span against the chosen horizontal reach. Overlapping coverage is merged before uncovered lengths are counted. No coverage passes through a break between separate spans.

Each position x covers [max(0, x−reach), min(length, x+reach)]; merge intervals, then report all remaining gaps.

Updated: September 2026

Example Scenarios

Try the built-in example, then replace its source data with your actual documented values. Retain failed comparisons and unresolved decisions.

→ 4 geometric receptacle positions

Try the built-in example, then replace its source data with your actual documented values. Retain failed comparisons and unresolved decisions.

→ 1 spans have uncovered gaps

FAQ

Create a centered minimum-count geometric layout on each supplied continuous eligible span. Distances follow the wall line and each span has two endpoints. Specify actual excluded openings as breaks instead of subtracting an assumed door width from total perimeter. Check furniture, access, mounting and placement restrictions on the real plan. Check a measured or proposed set of receptacle coordinates on each eligible span against the chosen horizontal reach. Overlapping coverage is merged before uncovered lengths are counted. No coverage passes through a break between separate spans.

Use the exact equipment, dimensions, current ratings, operating conditions and applicable requirements described in the selected mode. Unknown values are not replaced by a generic wire, device count or capacity. Illustrative examples are arithmetic examples, not an approved installation.

Save planning case keeps an explicit local history entry. Copy MD retains current inputs, source notes and interpretation; Download CSV exports the current result breakdown. Export a separate copy before changing devices or clearing browser storage.

About Receptacle Spacing and Coverage Calculator

Create a centered minimum-count geometric layout on each supplied continuous eligible span. Distances follow the wall line and each span has two endpoints. Specify actual excluded openings as breaks instead of subtracting an assumed door width from total perimeter. Check furniture, access, mounting and placement restrictions on the real plan. Check a measured or proposed set of receptacle coordinates on each eligible span against the chosen horizontal reach. Overlapping coverage is merged before uncovered lengths are counted. No coverage passes through a break between separate spans.