How to Compare K-Beauty Prices When Sizes Differ
A shopping example explains price per 10 ml and why grams and millilitres need separate treatment.
When shopping for Korean beauty online, compare total price and pack size before judging whether a listing fits your budget. THE CAST product pages provide sizes and prices that can be used for a simple unit-price calculation.
Calculate a per-10-ml reference
Divide the listed price by the number of millilitres, then multiply by ten. At prices observed on 10 November 2026, a 50 ml smoothus listing at KRW 26,600 works out to KRW 5,320 per 10 ml; a 50 ml LUMIPURA listing at KRW 40,000 works out to KRW 8,000 per 10 ml.
Keep the comparison in context
Those figures compare listed quantities and prices, not product performance or suitability. Check ingredients, product type and directions, and compare shipping, taxes and any applicable discounts separately. A 50 g listing should not be converted to millilitres without density information.
Check the current listing
Prices and availability may change after this snapshot. Confirm the current size and checkout total on the product page before ordering.