The one division that matters
Break-even orders equal the annual fee divided by the saving per order. A $139 annual fee against $6.99 of shipping saved per order gives 19.9, so 20 orders a year. That is an order every two and a half weeks without a gap, for a full year. Whether you place 20 orders a year is a fact about your account history rather than an opinion, and it is the first thing to check.
Other benefits shift the division rather than replacing it. If rewards, member discounts and bundled services are worth $40 a year to you, only $99 of the fee needs covering by shipping, and the break-even count drops to 15 orders. The calculator does the arithmetic in that order deliberately: shipping is the benefit with a hard number attached, and everything else is a valuation you supplied.
Valuing the parts that are not shipping
| Benefit | What to enter | What not to enter |
|---|---|---|
| Shipping or delivery | What a non-member pays on an order your size | The highest shipping charge you have ever seen |
| Extra rewards | The rate above what a non-member earns | The full member rate |
| Member discounts | Money you redeemed, averaged over three months | The face value of coupons you were sent |
| Bundled services | What you would pay for it standalone | Its list price, if you would never subscribe |
The rewards line catches people. If members earn 3 percent and everyone else earns 1 percent, the membership is worth 2 percent, not 3. Entering the full rate can turn a losing membership into a winning one on paper, which is exactly the sort of error that survives unchallenged because the answer is pleasant.
The caveat that ruins the arithmetic
A membership that changes how much you buy is not a saving. This is not a moral point, it is a measurement problem: the entire calculation rests on the orders you would have placed anyway, and free delivery is designed specifically to remove the friction that used to stop the small order. The $4 item you would once have held back for a bigger order now ships on its own, and it counts as a saved delivery charge in this model while being, in fact, a purchase that would not have happened.
The induced-spending field puts a number on this, and it counts half of what you enter, on the reasoning that some of that spending was going to happen eventually. Half is a guess. The direction is not. If your order count rose sharply in the month you joined and never came back down, the honest reading is that the membership sold you convenience and you paid for it. That can be fine. It should not be filed under saving.
Reading the ratio
The verdict runs on benefits divided by fee rather than on the surplus alone, because the surplus does not tell you how fragile the result is. A membership returning twice its fee survives a quiet quarter, a move, a change of job. One returning 1.1 times its fee is a rounding error away from a loss and will cross the line the first time the fee rises. Treat anything between 1 and 1.2 as an argument for cancelling and rejoining when you next need it, particularly where monthly billing is available.
When the fee changes
A fee increase raises the break-even count without altering a single habit. A membership that needed 15 orders at one price needs 19 at a price 25 percent higher, and nothing in your behaviour will move to meet it. The announcement of an increase is the natural moment to re-run this, and it is also the moment when years of membership feel most like a reason to stay. They are not one.
Two smaller things
Annual billing is usually cheaper per month and usually harder to exit partway through, so it is a poor choice when the result is marginal — the flexibility of monthly billing is worth most precisely when you are near the line. And a free trial is always positive while it runs; the risk is the automatic conversion, so the safe procedure is to schedule the cancellation on the day you start and undo it only if a calculation like this one says keep.
Questions people ask
How many orders do I need for a $139 membership?
Divide $139 by what an order saves you. At $6.99 of shipping per order it is 20 orders a year. At $4.99 it is 28. At $9.99 it is 14. The saving per order is doing more work in that answer than the fee is.
Should I count the free trial period?
No, it earns nothing and costs nothing. What matters is the automatic conversion at the end. Set the cancellation the day the trial starts and undo it only if a calculation on your real order history says the membership clears its fee.
How do I value a bundled streaming or music service?
At what you would pay for it as a standalone subscription, which for most people is either the full price or zero with very little in between. If you watch it because it is there rather than because you sought it out, enter zero and see whether the membership still holds up.
The membership made me order more. Is that a benefit?
It is a benefit to the seller. More orders at a lower delivery cost each is not the same as spending less, and the extra-spending field exists to show how far the two diverge. Count only orders you would have placed without the membership.