Compare coupon caps, minimum spend, eligible items and shipping together.
Find the minimum payment within your fixed cart and entered terms, then save an order allocation.
Starting values are fictional. Replace them with your items and actual coupon and shipping terms.
Up to 8 items, 4 coupons and 3 orders in whole KRW. Each item row is indivisible. Compare only planned purchases; different checkout stores cannot share one order.
Minimum payment within entered assumptions · Fictional example / unreviewed terms
KRW 62,000
Optimal orders: 1 · Savings vs no-coupon baseline: KRW 8,000
Original goods total
KRW 70,000
Merged baseline without coupons
KRW 70,000
Extra savings from splitting
KRW 0
1 orders, total: KRW 62,000 · Coupon discounts: KRW 8,000 · Shipping: KRW 0
Coupon application sequence
Cost by shipping bundle
Unused coupons: KRW 5,000 off
Rows are indivisible. Discounts are allocated proportionally to eligible remaining balances, with leftover won assigned by largest remainder then item order. Ties favor fewer orders, then fewer coupons.
Before buying, compare eligibility, usage limits, sequence and shipping against actual terms and final checkout. Extra items, card benefits and live prices are excluded.
Review date: None
Cart coupon and split-order review (2026) Unit: KRW, whole won Conditions reviewed: Example / unreviewed; No review date Notes: Maximum orders: 3; Coupon order: Optimize permutations Minimum within entered assumptions: KRW 62,000 Merged baseline without coupons / savings: KRW 70,000 / KRW 8,000 Extra savings from splitting: KRW 0 Input items 1. Household item 1: KRW 40,000; Seller A shipping bundle 2. Household item 2: KRW 30,000; Seller A shipping bundle Shipping rules Store A / Seller A shipping bundle: KRW 3,000; Free threshold KRW 50,000; Original amount before coupons Coupon rules (each once) 20% off, cap KRW 8,000: 20%; Cap KRW 8,000; Minimum KRW 30,000 / Entire order / Original amount before coupons; Discount basis Remaining amount at this step; Won rounding floor; Stacking Alone; Eligible Household item 1, Household item 2 KRW 5,000 off: KRW 5,000; Cap None; Minimum KRW 30,000 / Entire order / Original amount before coupons; Discount basis Remaining amount at this step; Won rounding floor; Stacking Alone; Eligible Household item 1, Household item 2 Best by exact order count 1: KRW 62,000 2: KRW 63,000 3: Infeasible Selected review plan: 1; KRW 62,000 Order 1: Store A; KRW 62,000 Household item 1: KRW 40,000 → KRW 35,429 Household item 2: KRW 30,000 → KRW 26,571 1. 20% off, cap KRW 8,000: Discount basis KRW 70,000; −KRW 8,000 Seller A shipping bundle: Threshold basis KRW 70,000; Shipping KRW 0 Discounts are allocated proportionally to eligible remaining item balances; leftover won follow largest remainders, then input item order. Each item row is indivisible. Ties favor fewer orders, then fewer coupons. Extra purchases, collection, reissued coupons and card benefits are excluded. Before buying, check eligible items, usage limits, ordering, rounding, free shipping and seller bundles against official terms and final checkout. This is a minimum within your inputs, not a checkout guarantee.
Buying the same household supplies in one order or several orders can produce different payments.
A large percentage discount can stop at its cap, and a split order can lose free shipping.
This calculator keeps your planned purchases fixed and compares eligible items, minimum spend, discount caps, coupon sequence and shipping together.
Its main result is the minimum payment within the entered assumptions, with an item and coupon allocation for each order.
Use it when combining appliance supplies and kitchen goods, buying for relatives, or deciding how to use several promotional coupons.
The objective is the cash payment for the same goods rather than the biggest displayed discount rate.
Extra purchases made solely to reach a threshold are outside the search, so unnecessary spending is not counted as a saving.
Check the resulting plan against actual checkout before paying.
Each price is the total for all units in that row, excluding shipping.
Rows are indivisible: enter separate rows if units of the same product may go into separate orders.
Each price may be zero to KRW 100,000,000 in whole won.
You may enter an already discounted product price, but do not enter that same discount again as an available coupon.
Each entered coupon can be used at most once across the entire plan.
You may enter no coupons and compare shipping alone.
Unused coupons are valid when they do not improve payment.
Choose an order limit from 1 to 3; results compare the best plan for each exact count.
Counts above the number of item rows are infeasible rather than filled with empty orders.
Both languages use KRW and whole won, with no currency conversion or automatic overseas tax.
Starting prices, rates and shipping thresholds are fictional examples rather than market prices or a particular store policy.
There is no universal coupon or free-shipping threshold; replace every setting with the terms for your purchase.
A store is the shop or platform on which the goods can share a checkout.
Matching names identify the same store after leading and trailing spaces are removed; other differences create separate stores.
Goods from different platforms cannot be combined into an order to meet a coupon threshold.
Four stores requiring separate checkouts cannot fit a three-order limit; calculate their carts separately.
Different sellers on one platform may still charge separate shipping fees.
Create a bundle for each set of goods that can share shipping.
Two bundles in one order each test their own goods amount against their own free-shipping threshold.
Splitting one bundle across two orders re-evaluates its fee in each order.
A free-shipping threshold of zero means shipping is always free; unused bundles incur no fee.
Include remote-area or cold-chain surcharges only if they follow the same per-order charging rule represented here.
Even a fixed coupon cannot discount more than the eligible remaining goods balance.
A KRW 5,000 coupon against KRW 3,000 of remaining eligible goods therefore discounts only KRW 3,000.
Shipping coupons and coupons requiring a minimum residual payment follow different terms and are outside this model.
Every coupon in a stack must allow stacking.
A coupon marked for use alone cannot share an order with another coupon.
Optimize sequences compares every valid permutation.
Listed order only applies coupons in the direction from row 1 to row 4, although some may be skipped.
Selective compatibility between particular pairs of coupons cannot be represented.
Original discount basis uses eligible prices before any coupons, even after earlier discounts.
Remaining basis applies the percentage to the eligible balance at that step, producing sequential discounts.
First round the discount down, to nearest, or up to whole won; then limit it by the cap and available eligible balance.
Check each coupon rounding rule and the store calculation order.
Discounts are allocated proportionally to eligible remaining item balances.
Each share rounds down to whole won, then leftover won go to the largest fractional remainders, with item input order breaking equal remainders.
These balances are used for later coupons and after-discount shipping tests.
A store that rounds each item independently or prioritizes a specific item can produce a different result; leave terms unreviewed when its allocation cannot be represented.
Order payment = original goods total − coupon discounts + shipping bundle fees.
Minimum payment = minimum sum of order payments over valid partitions, coupon allocations and sequences.
Percentage discount = min(eligible remaining balance, cap or no cap, rounding[discount basis × rate ÷ 100]).
Savings = merged baseline without coupons − optimal payment.
Every item is assigned to exactly one order, and each coupon is used at most once in the whole plan.
The calculation evaluates valid subsets of up to 8 items, allocations and sequences of up to 4 coupons, and every valid partition into up to 3 orders.
It does not stop early with an approximate result.
Identical inputs produce the same result.
Payment ties favor fewer orders, then fewer used coupons, with remaining ties resolved by deterministic input-based traversal.
Exact minimum means exact within the entered prices, constraints and allocation rules.
The calculator does not collect current prices or store rules and does not guarantee a matching checkout amount.
The no-coupon baseline places all goods for each store in one order and tests shipping once per used bundle.
Assume item A costs KRW 40,000 and item B costs KRW 30,000, from the same checkout store and shipping bundle.
Shipping costs KRW 3,000 per order and is free at KRW 50,000 before coupons.
Two coupons each require KRW 30,000: 20% off capped at KRW 8,000, and a fixed KRW 5,000 discount.
Both must be used alone.
These fictional amounts are checked against the shared calculation function.
| Plan | Discount | Shipping | Payment |
|---|---|---|---|
| Merged, no coupons | 0 | 0 | 70,000 |
| ★ Best one-order plan | 8,000 | 0 | 62,000 |
| Best two-order plan | 13,000 | 6,000 | 63,000 |
In two orders, A receives KRW 8,000 off and B receives KRW 5,000 off, but neither meets the free-shipping threshold.
The additional KRW 5,000 discount is outweighed by KRW 6,000 shipping, making splitting KRW 1,000 more expensive.
Set shipping fees to zero and the split plan becomes the minimum at KRW 57,000.
If both coupons permit stacking and shipping uses original prices, one order can also receive KRW 13,000 off and cost KRW 57,000.
The top minimum always shows the overall optimum, regardless of the selected scenario.
The allocation below shows the best plan for the selected exact order count.
Total savings compares against the no-coupon baseline; extra split savings compares against the best discounted plan with the fewest feasible orders.
When one order is optimal, extra split savings is zero.
Skipping a coupon can be optimal when its discount triggers a larger shipping fee.
A KRW 70,000 cart reduced to KRW 57,000 by stacked coupons fails a KRW 60,000 after-discount shipping threshold.
Add KRW 3,000 shipping for a KRW 60,000 payment.
Choosing original-price timing by mistake understates payment.
The exact threshold qualifies for free shipping; one won below it does not.
An order may total KRW 70,000 while eligible goods total only KRW 30,000.
A coupon with a KRW 40,000 eligible-item minimum cannot be used.
Match the minimum scope to the actual terms when a family cart includes excluded products.
Goods from different sellers can share an order only when their checkout store matches.
A coupon tested on remaining spend can make sequence decisive.
Starting at KRW 70,000, apply a KRW 5,000 fixed coupon requiring KRW 65,000 first, leaving KRW 65,000.
Then apply uncapped 20% off, leaving KRW 52,000.
Applying 20% first leaves KRW 56,000 and makes the fixed coupon fail its minimum.
Shipping in this example is free on the original amount.
Do not rely on an optimized sequence when the actual store mandates another order.
Reviewed inputs requires both a review date and the terms confirmation checkbox.
It does not guarantee coupon issuance or a successful checkout.
Editing terms clears the previous result and confirmation; recalculate before saving an updated plan.
The TXT includes all item, shipping and coupon inputs, sequence, review date, notes and the selected order allocation.
No.
Caps, eligible balances, minimum spend and shipping can make a fixed coupon or no coupon cheaper.
Each entered coupon is used at most once in the whole plan.
If you actually hold two separate coupons, check their terms and enter separate rows.
No.
It allocates only your planned goods and does not label additional spending as savings.
Compare a deliberately different cart as a separate scenario.
It means no cap.
Discounts remain limited to eligible balances, preventing negative goods amounts.
A zero free-shipping threshold separately means always free shipping.
Each row is indivisible.
Enter separate rows with their quantities included in row prices and review coupon eligibility for each.
Equal payments favor fewer orders, then fewer used coupons.
Remaining ties use deterministic input-based traversal.
The calculator displays one plan rather than every equal solution.
Both languages use the same whole-KRW inputs and shared formulas.
English provides translated labels and detailed guidance without conversion or automatic foreign tax.
Check eligibility, minimum scope and timing, coupon sequence, whole-won allocation, seller bundles and after-discount shipping.
Actual terms and final checkout take precedence; update the saved assumptions and recalculate.
The implementation year is 2026 and algorithm references were reviewed on 2026-10-02.
The official Google OR-Tools pages below describe assignment and constraint modeling rather than coupon terms or shipping tariffs.
This calculator uses its own finite search and does not call an external optimization service.
It does not calculate statutory tax or refund rights.
Recheck prices, coupon scope, usage limits, sequence, rounding and shipping at the official store terms and final checkout for every purchase.
Match planned purchases and seller bundles first, then enter detailed coupon terms.
Compare the optimum with exact-order-count alternatives and save a TXT or printed review including assumptions.
Use a recalculated plan whenever prices or terms change.