Read the qualifier beside the number
The selected DHC title states 6.7 fl.oz., a volume declaration. The selected e.l.f. regular balm explicitly states NET WT2 OZ(56.5 g), a mass declaration. Naturium's current product details state 3.0 FL OZ/88 ML, again volume despite the balm format. Dropping the words fluid or net weight would make those records misleading. A jar's shape, a product's solid appearance and a short retailer title cannot substitute for the actual declared basis.
Do not assume a density
Mass and volume are not interchangeable without a supported product-specific relationship. The site does not assume that one gram equals one milliliter for either balm or oil. It therefore does not convert the e.l.f.56.5 g jar to 56.5 mL, nor Naturium's 88 mL jar to 88 g. A water-based shortcut would invent a property that has not been established for these formulations. The unit-cost tool rejects unsupported bases rather than returning a precise-looking number from that assumption.
Keep paired label quantities as stated
Naturium supplies both 3.0 fluid ounces and 88 mL. These are the maker's paired declarations and may reflect labeling rounding; they are not an independently measured fill. The tool can calculate against either declared figure without forcing them into an exactly identical ratio. The DHC record uses its verified 6.7 fluid-ounce statement; it does not add an unverified metric label simply because a related market listing commonly uses one. The e.l.f. record preserves 2 net-weight ounces and 56.5 g.
Make the comparison readable
At the selected prices, e.l.f.'s $12 regular jar is about $0.2124 per declared gram. Naturium's $20 jar is about $0.2273 per declared milliliter. Those figures have different denominators and are not a shared cheapest-product ranking. For a useful purchase note, write the full unit after the price and retain the exact product code. If a listing omits the qualifier, request a current quantity statement before comparing it with a better-specified offer.
A useful comparison note includes the whole unit
For example, a note that says twenty cents per unit is incomplete. It could mean a gram, a milliliter, a net-weight ounce or a fluid ounce, producing very different readings. Write e.l.f. 59910 at 0.2124 USD per declared gram and Naturium NATR-10069 at 0.2273 USD per declared milliliter instead. The visible distinction prevents a spreadsheet from sorting unlike measures into a false cheapest list. If a system requires one shared basis and no density is documented, leave that comparison unavailable. A missing cross-basis number is more accurate than a number created from an unstated water-density assumption.
Sources & scope
Checked November 4, 2026. Manufacturer and retailer references support the specific statements. Dated displayed prices are not final checkout quotes, performance rankings or performance testing. This shopping reference does not replace the exact product label or qualified individual advice. Current received labels, formula-version history and independent clinical/content/commerce review remain pending.
DHC US: Deep Cleansing Oil, selected SKU300 ↗
e.l.f. US: Holy Hydration regular SKU59910 ↗
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