What is cost-per-ounce comparison, and why doesn't Amazon show it?
Cost-per-ounce comparison means dividing a product's total price by its total weight in ounces, so you can compare a 12-ounce jar against a 40-ounce tub on equal footing. Amazon's default sort orders results by relevance or total price — not by the true value per unit — so a smaller, more expensive-per-ounce container can rank above a larger, cheaper one just because its sticker price is lower. Manufacturers also use pack-size language like "family size" or "value pack" that implies savings without guaranteeing a lower cost per ounce.
Dealophant closes that gap. It calculates true value-per-unit automatically for every listing it indexes, so the cheapest cost per ounce is always surfaced first — free, with no account required.
How Dealophant calculates true value per unit
Every search pulls live listings from the Amazon Product Advertising API, parses each title for its quantity (e.g., "32 oz", "Pack of 6"), and classifies the unit family — weight, volume, count, or servings — using an LLM classifier with Amazon's own per-unit pricing data as a fallback. Weight-based products are normalized to ounces; volume-based products to fluid ounces. Listings are then ranked within their category by price ÷ unit count, ascending, with no commission weighting. Full methodology is at /how-it-works.
FAQ
- Is Dealophant free?
- Yes, completely free, no account required. There's no subscription and no paywall.
- How does Dealophant find the cheapest cost per ounce?
- By pulling live Amazon listings, normalizing each to a base unit (ounces or fluid ounces), and ranking by price ÷ unit count, ascending.