What a store run really costs (it's not the gas)

Nobody prices the trip.

You'll comparison-shop a $9 pack of trash bags between two stores, then drive twenty-two minutes to save eighty cents. We did it for years. The store's price tag covers exactly one thing — the item — and leaves the two biggest costs of buying it off the receipt entirely.

The two lines the store never prints

The drive. Right now our default math uses a suburban round trip and current-ish gas prices: about $8–$16 — $0.66 in gas (5 mi round trip at 26 mpg, $3.42/gal) and $7.50–$15.00 in time (30–60 minutes at $15/hr).

Your time. That's the number that stings. The gas is real but small; the fifty-some minutes of driving, parking, wandering the aisle because they moved the detergent again, standing behind someone doing a return, and driving home — that's the actual bill.

That's not our opinion of what you should value your time at. It's a deliberately conservative $15 an hour — below the median US wage. If you earn more, your store runs cost more.

"But I like getting out of the house"

Fair. This isn't an argument against ever entering a store. It's an argument against re-buying the boring stuff in person. Trash bags don't need to be squeezed for ripeness. The 42-count omeprazole doesn't have a produce section. Every staple you move from cart-in-the-parking-lot to cart-on-the-website deletes a fraction of a trip from your year.

The store trip you keep should be the one you actually want to take — not the one the empty wipes box forced on you at 8pm on a Tuesday.

What we don't count (which helps the store)

Our trip math leaves out three real costs, all of which would make the store side look worse:

• The impulse tax. Checkout-lane research puts unplanned spend at several dollars per trip. The store's whole floor plan is engineered for it.
• Return trips. An Amazon return is a QR code. A store return is a second round trip — the whole receipt again.
• The kid multiplier. If you're shopping solo with small children, you already know the trip costs more than any spreadsheet says.

We'd rather under-claim and be believed. Our calculator keeps gas and time separate from the item-only verdict, so an avoided trip never disguises a higher Amazon price.

Run your own numbers

Every assumption above is a slider on our trip cost calculator — your MPG (there's a minivan preset, because of course there is), your miles, your gas price, what your hour is worth. Then use the separate Subscribe & Save calculator with the exact current prices on your screen.