When topping up your cart actually saves money
Adding items to dodge a shipping fee only saves money if what you spend to reach the threshold is less than the fee you avoid — otherwise you're paying more overall just to make the shipping line read zero.
- Cart total — what's currently in your cart
- Threshold — the spending level that unlocks free shipping
- Shipping fee — what you'd pay if you check out below the threshold
More detail
Topping up can be a net loss
If you're 20,000 short of the threshold and shipping is only 3,000, adding a 20,000 item to save 3,000 is a net loss of 17,000 — you spent 20,000 to avoid paying 3,000. Topping up only makes financial sense when the gap to the threshold is smaller than the shipping fee itself, not just close to the threshold.
Shopping tip. Before adding a random item just to clear the threshold, check whether it's something you'd actually buy anyway — if not, the 'net benefit' figure above needs to be positive on its own, since an unwanted item is money spent with no offsetting value.
Frequently asked questions
My cart is 48,000 won, the threshold is 50,000, and shipping is 3,000 — should I add more?
You need 2,000 more to reach the threshold, which is less than the 3,000 shipping fee you'd avoid — so adding 2,000 worth of items you'd actually use nets you a 1,000 won benefit.
My cart is 30,000, the threshold is 50,000, and shipping is 3,000 — is it worth topping up?
No. You'd need to add 20,000 to reach the threshold, far more than the 3,000 shipping fee — that's a net loss of 17,000 unless you genuinely need the extra items regardless of shipping.
What if the amount needed exactly equals the shipping fee?
That's a break-even case, not a saving — you're paying the same amount either way (as extra goods vs. as a shipping fee), so this calculator marks it as not worth it since there's no cost advantage, only more stuff for the same money.
Is it ever worth buying something I don't need just to hit the threshold?
Yes, whenever the amount needed is smaller than the shipping fee — topping a 48,000 cart up to a 50,000 threshold costs 50,000, against the 51,000 you'd pay with the fee, so the cash outlay really does drop. Once the gap equals or exceeds the fee you're not saving money, you're just converting a shipping fee into an unwanted purchase of a similar or larger size.