Compare beauty sizes, sets and unit prices
Avoid confusing a large-looking package, a multi-item set and a lower unit price with the best fit for your order.
Put like quantities beside each other
First match the product type and unit of measurement. Two liquid products labeled in ml can be compared on a common volume basis. Two products labeled in g can be compared by mass. Do not convert g into ml without reliable information for that product, and do not compare sheet count directly with bottle volume.
For a simple product-price comparison, divide the displayed product price by the stated quantity, then multiply by 100 for a price per 100 ml or 100 g. Use the same currency and the same price conditions for both items.
A worked example, not a current offer
Consider two hypothetical bottles: 80 ml at KRW 16,000 and 120 ml at KRW 21,000. The first is KRW 20,000 per 100 ml; the second is KRW 17,500 per 100 ml. Those numbers explain the calculation only. They are not THE CAST product prices or an advertised promotion.
The second bottle has a lower unit price in this example, but the first costs less upfront. The better fit depends on the amount you want, the product itself and your order. Unit price does not measure performance or suitability.
Unpack a set before comparing it
List every included item and size. A full-size bottle with two samples is different from three full-size bottles. If a listing offers several set options, use the contents of the option you actually select rather than the largest arrangement in the photos.
- Check whether the listing is one item, a pair, a refill, a trial kit or a mixed set.
- Confirm whether a pictured pouch or accessory is included.
- Keep gifts and conditional promotions separate from the base contents.
- For masks, record both the number of sheets and any stated contents per sheet.
Add delivery after the product comparison
A product-only unit price is useful for comparing the items. Your order total also includes the shipping quote and any other charges shown for your destination. Adding more items can change the packed-weight band, so a lower unit price does not automatically produce a lower delivered total.
Use the shopping screen for the current product price and shipping calculation. Save the exact product link and selected option when asking about a set, so customer support can identify the same configuration.