Free tool

Transformer Sizing Tool

Add your fixtures by type, enter the longest wire run and gauge, and the tool recommends a transformer size, estimates voltage drop and suggests a multi-tap setting. Austin Landscape Lighting confirms every number with a meter during night aiming.

–recommended transformer
–
Connected load
–
With 25% headroom
–
Voltage drop on longest run
–
Suggested tap
–

Rule of thumb only. We size every Austin Landscape Lighting transformer from the actual wire plan and meter the voltage at each fixture during the night aiming visit.

About this tool

Why leave 25 percent headroom?

Transformers run cooler and last longer below 80 percent load, and headroom lets you add a few fixtures later without replacing the transformer.

What is voltage drop and why does it matter?

Resistance in the wire lowers voltage at the far end of a run. LEDs tolerate some drop, but too much dims fixtures or causes flicker. Heavier wire, shorter runs and multi-tap transformers fix it.

Can one transformer serve the front and back yard?

Sometimes, but long runs around a house usually argue for a second transformer or a hub-and-spoke layout. We decide from the wire plan.

More tools

Keep planning

How Many Lights Do I Need?

Estimate fixture counts for your facade, paths, trees and patio in under a minute.

Open tool

Project Cost Estimator

Build a planning budget from fixture count, fixture grade and smart controls.

Open tool

Lighting Visualizer

Switch techniques on and off in a night scene and watch the design come together.

Open tool

LED Savings Calculator

See what an LED retrofit saves versus halogen, per year and over a decade.

Open tool

Free design consultation

Ready to see your property in a whole new light?

Consultations with Austin Landscape Lighting are free, fast and zero-pressure. Most homeowners are surprised how affordable a professional system can be.

Schedule My Free Estimate Call +1 (281) 704-7210