Landscape Lighting Calculator
Calculate how many landscape lights you need along a path or driveway based on length, spacing, and starting position. Use this when planning low-voltage lighting installations for even, professional-looking coverage.
About this calculator
This calculator determines the number of evenly spaced lights along a linear path using the formula: Lights = floor((path_length − start_offset) / light_spacing) + 1, where path_length and start_offset are in feet. The start_offset is the distance from the beginning of the path to the first light, which is often set back slightly for aesthetic reasons. Subtracting the offset gives the usable path length, dividing by light_spacing gives the number of gaps, and adding 1 converts gap count to fixture count. The floor function ensures you never place a light beyond the end of the path. Standard landscape light spacing ranges from 6 to 8 feet for path lights, though accent and wash lights may be spaced further apart based on beam spread.
How to use
You have a 40 ft driveway path, want to place the first light 2 ft from the start, and plan to space lights every 6 ft. Lights = floor((40 − 2) / 6) + 1 = floor(38 / 6) + 1 = floor(6.33) + 1 = 6 + 1 = 7 lights. These 7 fixtures will be placed at 2, 8, 14, 20, 26, 32, and 38 ft along the path, leaving a 2 ft gap at the far end. Adjust spacing or offset to move the last light closer to the end if desired.
Frequently asked questions
How far apart should landscape path lights be spaced for best coverage?
Most landscape designers recommend spacing path lights 6 to 8 feet apart for standard 4–6 watt LED path fixtures. This spacing provides overlapping light pools that illuminate the walking surface without creating dark gaps. Wider spacing (up to 10 ft) works if your fixtures have a broad beam spread or higher wattage. Closer spacing (4–5 ft) is better for narrow paths, dense planting borders, or safety-critical areas like steps and grade changes. Always check the fixture's listed coverage radius before finalizing spacing.
What wattage and voltage system should I use for landscape path lights?
Most residential landscape path lights run on a 12-volt low-voltage system powered by a transformer plugged into a standard outlet. LED path lights typically consume 2–7 watts each, making them very energy-efficient. To size your transformer, total the wattage of all fixtures and add 20–25% headroom — for example, 10 lights at 5 watts = 50 watts, so a 60–75 watt transformer is appropriate. Low-voltage systems are safe to install yourself, unlike line-voltage (120V) systems which require a licensed electrician.
How do I account for curves and bends when calculating landscape lighting along a path?
This calculator is designed for straight paths, but curved paths can be handled by measuring the actual path length along the curve rather than straight-line distance. Use a measuring wheel or flexible tape laid along the path surface to get an accurate length. For paths with sharp bends or multiple segments, calculate each straight or gently curved segment separately, then sum the fixture counts. Place a light at or near each bend point to ensure the turn is well-lit and clearly visible for safety.