Outdoor Lighting Wire & Transformer Load Calculator
Estimate low-voltage lighting transformer capacity and cable wire gauge.
Interactive Material & Cost Estimator
HomeYardMath.com — Hardware Store Shopping List
Estimated Material Needed 9,000 sq ft (+0% buffer)
Net + Buffer Area 9,000 sq ft 9,000 base sq ft
Coverage Per Package 100 sq ft per unit (100 ft spools)
Total Units / Packages to Buy 90 100 ft spools
Waste Buffer Included +0% included
Estimated Project Material Cost 90 100 ft spools
Retail Package Total $5398.20 Before local sales tax
With Delivery / Bulk $5398.20 Direct store pickup
Quick Reference Coverage Chart (Home & Interior)
Instant pre-calculated material estimates for common US residential project sizes before compaction buffer:
| Typical US Project | Area | Depth | Volume | Weight | Store Bags |
|---|---|---|---|---|---|
| 10 LED Path Lights (60W total, 150 ft wire) | 150 ft run | 12/2 AWG Wire | 150W Transformer + 12/2 Wire | 25 lbs | 1 transformer + 2 wire spools |
Engineering Formula & Material Density Constant
Transformer Watts = Total Fixture Watts × 1.20 Safety Buffer
Calculates total low-voltage (12V) LED fixture wattage load, transformer size, and minimum wire gauge to prevent voltage drop over long cable runs.
Why 12/2 AWG Wire Beats 14/2 Wire
For wire runs exceeding 100 feet, always use heavy 12-gauge or 10-gauge direct burial cable to prevent end-of-run LED flickering caused by voltage drop.
Frequently Asked Questions
What size transformer do I need for landscape lighting?
Add up all your LED fixture watts and multiply by 1.2; select a transformer with at least 20% headroom.
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