Choosing row spacing affects everything from machinery compatibility to canopy closure and weed competition. This calculator works out how many rows will fit across your field width at a given spacing, helping you plan seed requirements and check that your spacing choice is compatible with your planting and cultivation equipment.
Number of Rows = Field Width ÷ Desired Row Spacing. The result is rounded down to a whole number of complete rows, with any remaining width noted as unused or available for a border/access path.
| Crop | Typical Row Spacing |
|---|---|
| Wheat | 18-23 cm (drilled) |
| Maize | 60-75 cm |
| Cotton | 75-90 cm |
| Sugarcane | 90-120 cm |
For a field 40 meters (≈131 ft) wide, planting maize at 75 cm (≈2.46 ft) row spacing: Number of rows = 131 ÷ 2.46 ≈ 53 rows, using about 130.4 ft of the field width and leaving roughly 0.6 ft unused — close enough that no adjustment is needed. If your planter is fixed at a different spacing, it's worth checking this calculation before finalizing your row layout to avoid wasted field edges.
For crops that benefit from faster canopy closure — like soybean or some maize hybrids — narrower rows can suppress weeds better and slightly improve yield. For other crops, spacing is more about matching equipment and airflow needs than a direct yield driver.
Row spacing is the distance between rows; plant population is the total number of plants per unit area, which depends on both row spacing and the in-row spacing between individual plants. You need both figures together to fully describe a planting layout.
Yes, this is often the deciding factor in practice — row spacing needs to match your inter-row cultivator, sprayer wheel tracks, or harvester header width, since mismatched spacing makes mechanical weeding or harvesting difficult or impossible.
Most farmers use the leftover width as a headland or access path along the field edge for turning equipment, rather than trying to force in a partial row that would be hard to manage at harvest.