Landscape Edging Length Calculator
Quick answer: Add the perimeters of your beds — a 12x8 ft rectangle needs 2 x (12 + 8) = 40 linear feet of edging — then add waste. Two such beds total 80 ft, and with a 10% waste allowance you should buy 88 ft. This calculator handles up to 3 beds as rectangles, circles, or custom perimeters, with a waste percentage you control.
Edging is sold by the linear foot, so the only question is how many feet of border your beds need. Enter up to three beds as rectangles, circles, or custom perimeters, and this landscape edging length calculator adds them up with a waste allowance for cuts and joins.
Enter your beds
Bed 1
Bed 2
Your results
Estimate only. Stakes and connectors are not included — check the edging brand's instructions for those.
How to use this calculator
Pick the number of beds (1–3), choose each bed's shape, and enter its dimensions. Rectangles need length and width, circles need diameter, and irregular beds can be measured directly as a custom perimeter in feet. Adjust the waste allowance to your project.
How it works
Rectangle perimeter = 2 x (length + width). Circle perimeter = pi x diameter. Custom perimeter = the value you enter. Total = (sum of bed perimeters) x (1 + waste%). The waste percentage is a user-adjustable estimate for cuts, joins, and measuring slack — not a measured constant.
Worked example
Two 12x8 ft rectangle beds: each bed is 2 x (12 + 8) = 40 ft, so 80 ft total. With 10% waste: 80 x 1.10 = 88 ft of edging to buy.
Reference data
This calculator is pure geometry — no external data. The formulas used are the standard rectangle perimeter, circle circumference, and a waste multiplier of (1 + waste%) applied to the summed perimeters.
Method & sources
Perimeter math is exact for the entered dimensions; the only estimate is the waste percentage, which you set. Results are reported in linear feet because edging is sold by length.
- Method: geometric perimeter math — no external data source required
Frequently asked questions
How do I measure how much landscape edging I need?
Measure the perimeter of each bed. Rectangles use 2 x (length + width), circles use pi x diameter, and curved beds can be entered as a custom perimeter in feet. Add the beds together plus a waste allowance.
How much extra edging should I buy for waste?
This calculator defaults to 10%, which covers cuts, stakes, and joining pieces. Raise it for irregular shapes with many cuts, or lower it if you are edging one straight run.
How do I measure edging for a curved bed?
Choose the custom perimeter shape and measure the bed's outline with a tape or garden hose in feet. You can also approximate a kidney shape as a circle with the bed's average diameter.
Does this calculator count the stakes or connectors?
No. This tool only computes edging length. Stakes and connectors are sold separately and their counts depend on the edging brand's instructions.
Is the result in linear feet?
Yes. The result is linear feet of edging to buy, including your waste allowance. Edging is sold by the linear foot, so no area conversion is needed.