Weight each measured station interval separately.
Why does averaging all offset widths give the wrong strip area?
Use the matching calculator
Use this decision sequence
- Record each station distance from a single baseline origin.
- Add the left and right offsets to obtain the width at that station.
- Keep the actual spacing between consecutive measured stations.
- Use extra stations where the boundary changes sharply instead of assuming a smooth average.
Keep the quantities distinct
| Quantity or assumption | How to use it |
|---|---|
| Equal station spacing | A common interval may be reused. |
| Unequal station spacing | Each interval needs its own measured length. |
| Station widths | Describe the boundary, not a recommended landscape layout. |
Worked comparison
At distances 0, 2 and 5 m, measured total widths of 2, 3 and 2 m give 2×(2+3)/2 + 3×(3+2)/2 = 12.5 m². An unweighted mean of the three widths multiplied by the 5 m baseline gives about 11.67 m² and ignores the longer second interval.
Check before using the estimate
Offsets are linearly interpolated between measurements. Curved or discontinuous boundaries need additional measured points. The example values are illustrative arithmetic inputs. Replace them with your measured plan, selected product information and actual quote where relevant.
All dimensions, product properties, prices and specifications in this example are illustrative arithmetic inputs. Use the values from your measured plan, selected product data sheet and supplier quote. This guide does not choose construction specifications or certify safety.
Calculation and scope checked 2026-10-04. Methods and scope.
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