A size ratio shows how many units of each size to order. Getting it roughly right reduces both stock-outs in popular sizes and leftover stock in the extremes.

Start with your own data

If you have sales history, count units sold per size for similar products. That is the most reliable starting point because it reflects your actual customers.

If you have no history

Begin with a curve weighted to the middle of the range. For example, a five-size run from small to extra large often puts the most units in medium and large, with fewer in the smallest and largest sizes.

Adjust for the product

• Relaxed or oversized styles may sell across fewer sizes.
• Fitted styles can show more demand at the size extremes.
• Kids’ ranges follow age groups, so check which ages sell best.

Consider your market

Typical body proportions and size preferences vary between regions and customer groups. Use local feedback and returns data where you can.

Review after the first sell-through

Compare the planned ratio with what sold. Adjust the next order, and keep notes by style so the lessons are not lost.

Do not over-complicate

A simple ratio that you review regularly is better than a complex model you do not maintain.

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