GetlyA flip that makes $20 profit sounds like a win. It might be a terrible use of your evening.
Say you buy a jacket for $15, sell it for $50, and pay $5.85 in platform fees. Profit: $29.15? No — $50 − $15 − $5.85 = $29.15 only if your time was free. It wasn't. If sourcing, photographing, listing, answering questions, packing, and dropping it off took 2.5 hours, that flip paid $11.66 an hour. Still not bad. But if it took 3.5 hours — a second sourcing trip, a relist, a buyer question thread — it's $8.33 an hour. Same flip, same profit, completely different job.
The three numbers that decide whether a flip is worth it
1. Profit after every fee. Sale price minus item cost, platform fee, payment processing, and shipping you absorbed — not just "sold minus bought."
2. Hours, honestly counted. Sourcing time counts. Listing time counts. The drive to the post office counts. The flips that look best on paper are usually the ones with the most uncounted hours hiding in them.
3. Real $/hour. Profit divided by hours. Compare it to your target rate, not to zero. A flip that beats your target is worth repeating; one that doesn't is a hobby, and that's fine — as long as you chose it knowingly.
Run the demo numbers (example data)
Jacket: bought $15, sold $50, fees $5.85, profit $29.15, 2.5 hours → $11.66/hr. Sneakers: bought $10, sold $30, fees $6.00, profit $14.00, 20 minutes → $42.00/hr. The sneakers made less than half the profit and paid nearly four times the hourly rate. Which one would you repeat ten times?
That's the whole game in reselling: the best flip isn't the biggest profit, it's the best profit per hour, repeated.
The one-minute check before you list
For every item, answer three questions before it goes live:
1. What do I keep? Sale price minus fees and shipping — the number after the platform takes its cut.
2. What did it cost me? Item cost plus packaging and postage — not just the thrift-store price tag.
3. What did my time earn? Profit divided by hands-on minutes, times 60. That's your real $/hour on that flip.
We built a free tool that does the same check for any sale: the Real $/Hour Calculator (free, in this store). Type the price, fees, cost, and minutes, and read your real hourly rate before you commit the evening.
And if you want that check across every flip, on every platform, with rollups by platform so you can see which marketplace actually pays: the Flip Tracker ($12, in this store) logs every buy and sale, takes every fee off the top, and shows profit and $/hour per item, per platform, and overall.
For the full picture across every hustle — not just flips — the Worth It — Side Hustle Profit Tracker ($19, in this store) tracks sales, expenses, and hours for Etsy, eBay, Poshmark, Mercari and more, and leads with the number that matters: your real $/hour. One payment, no subscription.
Profit is a headline. $/hour is the verdict. Run both numbers before the next flip, and let the real one make the decision.