At LightBulbSurplus, we know that one of the biggest challenges in installing low-voltage landscape lighting is figuring out the right wire gauge. Use wire that’s too small, and you’ll deal with dim lights, wasted power, and potentially unsafe conditions. Go too big, and you overspend on cable you don’t need.

That’s why we’re excited to introduce our brand-new Landscape Lighting Wire Gauge Calculator— a free, easy-to-use tool designed for homeowners, contractors, and landscape professionals.

Why Wire Size Matters in Landscape Lighting

Landscape lighting runs on 12V power, and voltage drop is always a factor. The further the wire runs and the more fixtures you connect, the more power is lost along the way. If the voltage drop is too high, your lights may appear dim or uneven. Choosing the right wire gauge (AWG) keeps your system efficient, balanced, and safe.

How Our Calculator Helps

Instead of guessing, you can now plug in three simple values:

• Total wattage of your fixtures on the run

• One-way distance from the transformer to the farthest fixture

• System voltage (usually 12V, with options for 13V–15V multi-tap systems)

The calculator instantly shows you the recommended wire gauge and a full breakdown of voltage drop calculations.

We even added a Contractor Mode toggle, which adjusts the acceptable voltage drop from 10% (homeowner standard) to 15% (real-world contractor tolerance). That means you can size wire the way professionals do.

Built for Installers and Homeowners

Whether you’re a DIY homeowner installing path lights for the first time or a professional contractor running dozens of fixtures across a property, this tool gives you the confidence that your wire choice is correct.

• ✅ Saves time in planning

• ✅ Reduces costly mistakes

• ✅ Improves lighting performance

Try the Calculator Today

You don’t have to guess anymore. Use the Landscape Lighting Wire Gauge Calculator today and make sure every run in your system is wired correctly.

And when you’re ready to buy, shop our full line of landscape lighting cable and low-voltage transformers for the best value in the industry.