Seed Potato Cutting & Plants, Tubers & Weight

Cutting large seed potatoes into pieces, each carrying at least one eye, lets you plant more area from less seed and cuts your seed cost. Every viable piece grows into a plant just like a whole small tuber. As long as each piece has an eye and enough flesh for energy, cutting is a normal, economical way to multiply planting material.

Enter your row spacing, in-row spacing, tuber size and how many pieces you cut per tuber, and it works out the plants you'll grow per area, the number of seed tubers you need, and the total seed weight to buy. It turns your spacing and cutting plan into a clear shopping and planting figure.

Aim for pieces of roughly 30–60 grams (about the size of a small egg), each with one or two healthy eyes. Pieces too small lack the stored energy for a strong start and emerge weakly; very large pieces waste seed. The number of pieces you can cut depends on the tuber's size — bigger tubers yield more usable pieces.

It depends on tuber size and eye distribution. A small tuber may be planted whole or halved, a medium one cut into two to four pieces, and a large one into four or more — provided every piece keeps an eye and enough flesh. Enter your typical pieces per tuber and the calculator scales the seed tubers and weight accordingly.

Cutting a day or two before planting and letting the surfaces 'suberise' (dry and heal) reduces rot, especially in cool, wet soil. In warm, dry conditions some growers plant fresh-cut. Healing the cut surfaces forms a protective skin that resists soil-borne disease and improves the strike rate of each piece.

Seed weight is the number of seed tubers you need multiplied by your average tuber weight. The calculator derives the tuber count from your plant population and pieces per tuber, then applies your tuber size to give total seed weight — the figure you actually buy. Add a margin for non-viable pieces and rejects.

Common potato spacing is around 70–90 cm between rows and 20–35 cm between plants in the row, closer for seed/baby potatoes and wider for large ware potatoes. Tighter spacing lifts plant population and total tuber number but reduces individual size. Set your row and in-row spacing and the tool computes hills per square metre and total plants.

Well-cut, properly sized and cured pieces yield comparably to whole seed of the same weight, which is why cutting is standard practice. The keys are an eye per piece, enough flesh for energy, clean cutting to avoid spreading disease, and healing the cuts. Poorly cut or tiny pieces are the usual cause of gaps and weak plants.

Yes — enter your spacing in your preferred units and the area in acres, hectares, bigha, guntha or m². The calculator works in plant population per area, so it adapts to any field size or unit and returns plants, seed tubers and total seed weight to match.

They're solid planning figures. Real seed needs vary with tuber size spread, how many usable eyes each tuber has, cutting waste and non-viable pieces. Add a buffer of 5–10% for rejects and gaps, and weigh a sample of your actual seed to refine the tuber-weight assumption.