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Landscape Lighting Layout and Transformer Load Calculator

Count evenly spaced path fixtures and compare manufacturer fixture VA with an entered transformer allowance in two separate planning modes.

Use this result well

Inputs that matter
Path length, Chosen maximum spacing, Sources and assumptions, Group 1 fixture count, and 8 more
Output to expect
Path fixture spacing, Fixture VA and transformer load
  • 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

Path fixture spacing

Place a fixture at each endpoint of one straight path and distribute the remaining fixtures evenly without exceeding your chosen maximum spacing. This is geometry; lighting coverage depends on actual photometry, mounting, obstacles and night testing.

Intervals = ceiling(path length / maximum spacing); fixtures = intervals + 1; actual even spacing = path length / intervals.

Fixture VA and transformer load

Total up to three fixture groups using manufacturer apparent-power ratings in VA. Compare the total with an entered transformer rating and its documented permitted load percentage. This does not choose cable size or certify a supply for a particular installation.

Total VA = Σ fixture count × rated fixture VA; allowed load = transformer VA × chosen permitted percentage; estimated RMS current = total VA / nominal secondary volts.

Updated: September 2026

Example Scenarios

The built-in example supplies labeled assumptions. Replace them with your own records before making a decision.

→ 8 fixtures

The built-in example supplies labeled assumptions. Replace them with your own records before making a decision.

→ Within entered VA allowance

FAQ

No. The layout is geometric. Actual photometry and night testing establish useful views; cable drop, ampacity, listing, connectors and installation requirements need a separate circuit review.

Use your own records on the units and period shown. Enter explicit zeros for absent amounts, verify current terms and record the dates and assumptions.

Choose Save planning case for local history. Copy MD includes current inputs, notes and interpretation; Download CSV exports the result breakdown. Keep a portable copy separately.

About Landscape Lighting Layout and Transformer Load Calculator

Place a fixture at each endpoint of one straight path and distribute the remaining fixtures evenly without exceeding your chosen maximum spacing. This is geometry; lighting coverage depends on actual photometry, mounting, obstacles and night testing. Total up to three fixture groups using manufacturer apparent-power ratings in VA. Compare the total with an entered transformer rating and its documented permitted load percentage. This does not choose cable size or certify a supply for a particular installation.