Free tool for marketplace sellers

What are bad reviews
really costing you?

Fill in four numbers you already know off the top of your head, and instantly see your review risk level and how much bad reviews cost you every year.

The math runs in your browser, and your numbers aren't uploaded.

Your numbers

Results update as you type.

Your bad-review risk level
🟡 Moderate

$0
Estimated loss per year
Lost conversions (shoppers scared off) $0
Wasted ad spend $0
Lost repeat buyers $0

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* An estimate, for reference only. See the assumptions

See the assumptions behind the math

All constants below use conservative values, and the result is an estimate.

  • Conversion drag by rating: the share of would-be buyers a low rating scares off. Below 4.0★ → 15%; 4.0–4.3★ → 8%; 4.3–4.7★ → 4%; 4.7★ and up → 2%.
  • Silent unhappy buyers ×20: TARP research found only about 4–5% of unhappy customers complain to the seller. So each public bad review stands for roughly 20 buyers who left without saying anything.
  • Repeat-purchase loss ×2 (set by this tool): a buyer who leaves a 1–2★ review takes about 2× one order's value with them (no repeat purchase, plus the people they tell).
  • Ad drag ×0.5: paid traffic takes the same conversion drop as organic; only half of it is counted against your ad budget.
  • Recoverable share 35% (set by this tool): the portion of that loss you can win back when unhappy buyers can reach you and you answer them.
  • Risk bump: if new 1–2★ reviews exceed 5% of monthly units sold, risk is set to High regardless of rating.

All constants are in one config block in this page's source.

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