For ordinary resale items in good condition, a practical rule of thumb is to start at about 25% to 40% of what you could realistically resell it for. That rule stops being useful once repair costs, cleaning, missing parts, or a slow market would shrink your profit too much, so your offer has to leave room for those costs.
The short answer
Use this as your starting point: if you think you can resell an item for $100, your opening buy price is often about $25 to $40. Closer to 25% makes sense when the item is ordinary, used, or likely to take time to sell. Closer to 40% makes sense when it is clean, complete, and likely to move quickly.
That is only a starting range. If the item needs work, sits in a weak local market, or will cost more than usual to list and ship, the right offer can be well below that range.
What that looks like in real life
Say you see a used blender you believe you can resell for $80. If it is clean, works well, and comes with the right jar and lid, an offer around $20 to $32 fits the rule of thumb.
If the same blender needs cleaning, is missing a part, or has scuffs that will make buyers hesitate, your offer should drop below that range.
Or imagine a jacket you could probably resell for $50. A clean, popular style in good shape might be worth paying $12 to $20 for. If it has pilling, stains, or a broken zipper, the number should move down fast.
The same idea works in reverse for near-new items. If the item looks barely used, is complete, and is easy to verify and list, you can usually stay near the top of the range. If it is rare or in demand, you may be able to pay more than the usual percentage because the resale risk is lower and the item should move faster.
When to pay less than the rule of thumb
Pay less when the item will cost you time or money before you can resell it. The biggest reasons are:
- Missing parts, accessories, or packaging
- Repairs you cannot ignore
- Heavy wear, stains, odors, chips, or cracks
- Cleaning, testing, or listing work that is more than usual
- Items that are bulky, fragile, or slow to ship
- A weak market where similar items are already sitting unsold
The more friction there is, the more your offer should fall. A popular item can still be a bad buy if it needs too much fixing, too much cleaning, or too much time before it sells. That is the point where the rule of thumb stops applying cleanly and your margin matters more than the percentage.
When you can pay more
You can sometimes pay above the usual range, but only when the item is likely to sell fast and predictably. That often happens with sought-after brands, near-new condition, seasonal items in season, or products with a strong resale record.
If an item is almost new, complete, and easy to list, you may be able to pay closer to the top of the range. If it is rare and buyers are actively looking for it, a higher offer can still make sense because your resale risk is lower.
Even then, keep the math grounded. Factor in fees, shipping, cleaning, packing materials, and any repair work. A rare or in-demand item is not automatically a good buy if the likely resale price does not leave room for those costs.
The quick sanity check before you buy
Before you hand over money, compare the item with recent sold prices, not just asking prices. You want to know what buyers actually paid, because listed prices can be misleading.
Then subtract the costs that will hit you after the purchase: platform fees, shipping, cleaning, packing materials, repair costs, and your time. If the numbers still leave enough room for profit, the offer is probably sensible. If they do not, lower your offer or walk away.
That quick check is the best boundary for the rule of thumb. The percentage gives you a starting point, but recent sold prices tell you whether the item is really worth that much to you.