Resale Profit Tracker (Multi-Item Reselling Profit Calculator)
Track profit across multiple resale items at once. Enter cost, shipping, marketplace fee rate and selling price for each item, and get per-item profit plus a running total for cost, revenue and profit. Your entries are saved in your browser.
Manage profit across many resale items at once
When reselling more than a handful of items, it becomes hard to track how much you are really making once you look past any single sale. money.basics.marketplace_fee (the marketplace fee calculator) is built for checking one item at a time; this tool lets you enter many items as rows in a table and see per-item profit alongside running totals for cost, revenue, profit and overall margin, all on one screen.
Everything you enter stays in your browser (localStorage) and is never sent to a server, so your list survives closing the tab and you can keep adding to it as you buy and sell. Clearing your browser data or using private browsing will remove what you have saved.
How to use the resale profit tracker
- Enter an item Fill in the item name (optional), cost price, selling price and shipping cost.
- Pick a marketplace Choosing a marketplace fills in a typical fee rate automatically. You can still edit the fee rate field directly.
- Add more rows Click "Add item" to add as many rows as the items you are tracking.
- Check the overall totals The "Overall totals" section below adds up cost, revenue, profit and margin across every item.
Tips for getting more out of it
- Switching marketplaces fills in a typical fee rate, but if you have a promotional discount or a volume-based rate, overwrite the "Fee rate" field with your actual rate.
- The item name is optional for the calculation, but jotting down a short note makes it much easier to make sense of the list later.
- Low-margin or negative-profit items are highlighted in red so you can spot which ones need a second look at your sourcing price.
- If you only need to check the profit on a single item, money.basics.marketplace_fee (the marketplace fee calculator) has fewer fields and is quicker to use.
When this comes in handy
Managing profit for a bulk purchase at once
When you buy several items in one lot, list them all in one table and compare which ones are actually profitable.
Tallying up a month of side-hustle reselling
Add a row for each item you sold during the month to get a rough sense of your total profit (this is not a substitute for proper bookkeeping for tax filing).
Spotting low-margin items
With every item's margin listed side by side, it is easy to see which ones are worth sourcing again and which are not.
Comparing marketplaces for the same item
Fee rates differ across Mercari, Rakuma, Yahoo! Flea Market and Yahoo! Auctions, so you can check which one leaves you with more per item.
Glossary
- Cost price
- What you paid to acquire the item itself, not including shipping or marketplace fees.
- Marketplace fee
- A percentage of the selling price that the marketplace deducts when an item sells.
- Profit margin
- Here, the share of the selling price that remains as profit after subtracting the cost price from the net receipt.
- Overall margin
- Not an average of each item's margin, but the total profit across all items divided by the total revenue.
Frequently asked questions
Side Note — Why reselling profit is easy to misjudge one sale at a time
When you are new to reselling, it is tempting to feel satisfied every time an individual item sells for more than you paid for it. In practice, though, most sellers end up with a mix of high-margin and low-margin items, and looking at sales one at a time makes it hard to tell how much you are actually making overall. If a large share of your items are low-margin, thin-profit sales, shipping and marketplace fees can quietly eat into what you take home more than expected.
Adding up profit across many items is a bit like tracking a household budget: any single purchase looks small, but totalling everything at the end of the month can reveal spending you had not noticed. In the same way, periodically reviewing your reselling profit as a total — rather than sale by sale — can point you toward which items are worth sourcing again and which marketplace is actually working out best for you.