Online Size Confidence Calculator

The tool starts with a base confidence score, then adjusts it using item-type heuristics (for example, relaxed/stretchy tops are more forgiving than structured garments like jeans or shoes). It then applies penalties or boosts for brand sizing consistency, your fit preference (slim vs relaxed), return hassle (wrong-size cost), and your body-to-chart mismatch severity. The final 0–100 Size Confidence Score blends these components into an overall recommendation and includes a risk breakdown.

Confidence changes most when the item is structured (jeans/pants, shoes, jackets) or when return hassle is difficult—those scenarios reduce tolerance for sizing error. Fit preference also matters: relaxed fits can “absorb” minor chart mismatch, while slim fits make the same mismatch riskier. Finally, brand consistency is treated as a stable pattern, so if a brand is known to be inconsistent, the recommendation shifts even when the item type is usually forgiving.

This tool uses heuristics—not exact garment measurements, fabric stretch %, or tailoring—so it can’t replace comparing the specific product’s measurements or checking real customer photos/reviews. If the mismatch severity is major, it will not recommend “Buy usual size” unless brand consistency is very high and returns are easy. For shoes and other structured items, the tool may automatically lower the recommendation when brand consistency is not strong, even if your score seems close to a safer range.