Shelf Impact Score Calculator

This calculator turns package-design decisions into a single 0-10 shelf impact rating by blending five weighted components. Size score uses a log2 scale on the front-facing area (width × height), which deliberately flattens out the benefit of making a package bigger — doubling facing area doesn't double shelf impact, reflecting the real diminishing-returns pattern shoppers show toward package size in a crowded aisle. Color contrast and typography scale are direct 1-10 self-ratings weighted at 25% and 20% respectively, capturing how much a package's palette stands out from neighboring competitors and how legible the brand name is at arm's length. Brand block coverage is scored non-linearly: 20-40% of the front panel devoted to brand elements scores a perfect 10, since retail design research treats that range as the sweet spot where the logo is prominent without crowding out other information — coverage below 20% is scored proportionally down, and coverage above 40% is penalized for looking cluttered or "shouty." Shelf facings (how many units sit forward-facing side by side) contributes a smaller 15% weight, capped once you reach roughly 4 facings, since additional identical facings have rapidly diminishing marginal visual payoff.

The final composite score is a straight weighted average of these five components (20/25/20/20/15%). Two secondary metrics round out the picture: a visibility-distance estimate (in feet) derived from facing area and contrast score, and a "billboard effect" figure showing total visible area across all facings combined. Because every input past facing dimensions is a subjective 1-10 rating, the tool is best used to compare your own package against a competitor scored on the identical rubric, or to track score improvement across successive redesign rounds — not as an absolute, universally comparable number.