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Use the prices and terms you see. We never hard-code store offers, so the tools stay useful.
Free shipping calculatorShould you add more
Should you add more
or just pay shipping?
Compare the real checkout totals. No guesswork, no sign-up—just a clear answer in seconds.
✓ Private by design✓ Instant answer✓ Always free
01
LiveEnter your cart details
Our take
Add the item
The added-item checkout is $80.00, saving $1.99 overall.
Run the numbers before you buy.
Simple calculators for the choices that show up at checkout and beyond.
01
Coupon vs Free Shipping
Which offer saves more?
Open calculator →02
Spend-Threshold Discount
Is spending more actually cheaper?
Open calculator →03
BOGO / Buy X Get Y
Find the real price per item.
Open calculator →04
Bulk Buy Comparison
Is the bigger pack better value?
Open calculator →05
Annual vs Monthly
When does the annual plan win?
Open calculator →06
Membership Worth It?
How soon will the fee pay back?
Open calculator →07
Extended Warranty
Does the expected value add up?
Open calculator →08
Cost Per Use
What will each use really cost?
Open calculator →Learn the math behind the offer.
Original, worked examples for free shipping, coupons, bundles, subscriptions, memberships, warranties, and cost per use.
Free shipping decision guide
Is Free Shipping Worth It? A Simple Way to Decide
Learn when adding an item to reach free shipping saves money, when paying delivery is cheaper, and how to compare the complete checkout totals.
Read guide →Free shipping formulaFree Shipping Threshold Formula—with Worked Examples
Use the free shipping threshold formula to calculate the amount missing, the break-even extra item price, and the cheaper checkout.
Read guide →Offer comparison guideCoupon or Free Shipping: Which Discount Saves More?
Compare a percentage-off coupon with free delivery using a quick formula, examples, exclusions, and a break-even cart value.
Read guide →Threshold discount guideSpend $100, Get $20 Off: Is the Deal Really Worth It?
Calculate whether adding products to reach a spend-$100-get-$20 discount lowers your total or creates unnecessary spending.
Read guide →BOGO discount guideHow to Calculate BOGO and Buy X Get Y Savings
Calculate BOGO savings, paid quantities, effective unit prices, and partial promotion groups without guessing.
Read guide →Coupon math guidePercentage Off vs Dollar Off: Find the Better Coupon
Find the break-even purchase amount and compare percentage coupons with fixed-dollar discounts using simple examples.
Read guide →Free shipping checklist7 Free-Shipping Mistakes That Quietly Raise Your Total
Avoid common free-shipping threshold mistakes, including filler purchases, lost coupons, returns, taxes, split orders, and delivery upgrades.
Read guide →Coupon stacking guideCoupon Stacking: How to Compare Multiple Discounts Correctly
Learn the correct order for percentage coupons, dollar discounts, free shipping, loyalty credit, and spend thresholds.
Read guide →Unit price guideUnit Price Shopping: Compare Pack Sizes Without Being Misled
Compare package sizes accurately across grams, ounces, sheets, doses, servings, and concentrated products while accounting for waste.
Read guide →Subscription decision guideAnnual or Monthly Subscription? A Complete Decision Checklist
Go beyond the advertised annual saving by checking break-even time, cancellation rules, price increases, cash flow, and expected usage.
Read guide →Membership value guideIs a Shopping Membership Worth It? Include These Hidden Costs
Calculate membership break-even using realistic savings while accounting for travel, delivery, renewals, overspending, and unused benefits.
Read guide →Warranty decision guideBefore Buying an Extended Warranty: Check These Alternatives
Compare an extended warranty with manufacturer coverage, retailer protection, credit-card benefits, repair funds, and replacement cost.
Read guide →Built for the checkout momentLess guessing.
Less guessing.
Better decisions.
See the true comparison
Each calculator normalizes the choices and shows the real difference in plain language.
Choose with confidence
Your cart inputs stay in your browser. There are no accounts, databases, or saved carts.
Original shopping research
What makes a useful answer?
We start with the complete amount paid, not the largest number in an advertisement. Then we test the formula against realistic examples, ties, thresholds, incomplete deal groups, and costs that can reverse the result.
Like-for-like totals
Coupons become dollar savings, packs become unit prices, and subscriptions use the same time period.
Important exceptions
Our guides flag exclusions, returns, waste, overlapping warranties, cancellation terms, and other limits the arithmetic cannot verify.
Transparent ownership
Ship or Spend Co. writes and reviews the calculators and guides independently. See our editorial policy and methodology.
Good to know.
Does spending more for free shipping really save money?
Only when the added-item checkout is lower than your original cart plus shipping. Ship or Spend also accounts for an optional spend-threshold discount so you compare the complete totals.
How is the free-shipping comparison calculated?
The calculator compares your original cart, eligible discount, and shipping charge with the cart after adding the item, applying free shipping and any newly unlocked discount where eligible.
Does Ship or Spend save my cart information?
No. Every calculation happens on your device. There are no accounts, databases, or store connections.
Can I use a different currency?
Yes. The arithmetic is currency-neutral. Keep every input in the same currency and the comparison remains valid.
Are these results financial advice?
No. They are estimates based on your inputs. Consider return policies, taxes, product quality, and whether you actually need the item.
Transparent calculations
Simple math, shown clearly.
Every result runs privately in your browser. See the formulas, assumptions, and limitations in our calculation methodology, or learn why we built Ship or Spend.