THE REFERENCE SHELF
Price & units
Calculate unit price using the declared quantity
Divide an obtainable price by the quantity printed for that specific product. Compare weights with weights and volumes with volumes.
Why grams and mL cannot be exchanged without density
Grams measure mass; mL measure volume. A cream or gel needs product-specific density to move between those quantities.
Small tube or large jar: compare commitment as well as cost
A larger container can lower the unit price while committing you to more of a formula. Both facts matter to the purchase.
Separate the shelf price from subscription and reward offers
A buy-once amount, first subscription price and future reward are different offers. Keep the conditions visible before comparing unit cost.
A US price snapshot that keeps unit conflicts visible
Three actual retailer observations, with the measurement limits left in the table. We do not force every cosmetic listing into a single g-or-mL ranking.