Construction

Outlet Count Rough Calculator

Estimate a rough number of wall outlets from total wall length and spacing between outlets.

Total wall length (m)
Spacing between outlets (m)

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The result is a planning guide for how many outlets the wall length needs at the chosen spacing, rounded up to a whole outlet.

Formula

Rough outlet count = total wall length divided by spacing between outlets, rounded up.

How it works

Add up the usable wall length in the room and divide by the spacing you plan between outlets. The count is a planning guide for layouts and quotes. Real outlet placement must follow local electrical codes and the room's actual use, not spacing alone.

Worked example

For example, a total wall length of 20 m divided by a spacing of 3.6 m gives 5.56, which rounds up to 6 outlets.

FAQs

Is spacing the only rule?
No. Codes also set rules for kitchens, bathrooms and special locations, and some walls need an outlet regardless of spacing.

Should doors and windows break the run?
Yes, measure usable wall sections separately in practice, since outlets cannot sit inside a doorway.

Who should install outlets?
A qualified electrician. This calculator plans counts only and is not an electrical design.

Rough estimate only — consult a licensed professional for structural work before building.