Inputs
Result
- Selling fee
- —
- You receive
- —
- Margin
- —
- ROI
- —
- Break-even price
- —
Sell at or above this to avoid a loss.
A **selling-fee profit calculator** for resellers who keep doing 'sale price − fee − shipping − cost' on a calculator for every listing. Pick a **marketplace** (Mercari, Rakuma, Yahoo and other fee-rate presets), then enter the **sale price, item cost, shipping, and fee rate**, and it shows your **selling fee, payout (what you receive), profit, margin, and ROI** in real time — plus the **break-even price** you need to avoid a loss. The fee rate is editable, so you can model an effective rate after point rebates or a campaign rate. When the profit goes negative it's clearly marked as a loss, so you can decide on the spot 'what price keeps me out of the red?' and 'does this buy price actually leave a margin?'. It's pure calculation: your inputs are never sent anywhere and everything runs in your browser — no account needed.
How to use
- Pick your marketplace (Mercari, Rakuma, Yahoo, etc.) — its selling-fee rate fills in automatically.
- Enter the sale price, item cost, and shipping (what you pay). Keep the preset fee rate or type your own to match an effective rate after point rebates.
- The panel on the right shows the selling fee, payout, profit, margin, ROI, and break-even price in real time. A negative profit is flagged as a loss.
FAQ
Are the amounts I enter sent anywhere?
No. Your sale price, cost, and other inputs are never uploaded — the calculation runs entirely in your browser. There's no sign-up or login, and nothing is stored on a server.
Which fee rates are supported? Can I use it for marketplaces other than Mercari?
Common selling-fee rates (Mercari, Rakuma, Yahoo, etc.) are available as presets. For any other service, or for an effective rate after point rebates or a campaign rate, just type the fee rate directly and it recalculates.
What is the 'break-even price'?
It's the sale price at which your cost, shipping, and fee are recovered and profit is exactly zero. Sell at or above it and you won't take a loss. It's a handy floor when a buyer asks for a discount — 'this is as low as I can go without losing money'.
What's the difference between margin and ROI?
Margin is profit as a percentage of the sale price; ROI is profit as a percentage of the item cost you invested. For the same profit, buying cheaper and selling raises ROI, so ROI is the more telling number when deciding whether a buy is worth it.
Is shipping treated as paid by me or by the buyer?
The amount in 'Shipping (you pay)' is subtracted from your payout as a seller-paid cost. It assumes free-shipping (seller-paid) listings, so if the buyer pays shipping on delivery, set shipping to 0.
Do I need an account or pay anything?
No. There's no sign-up or login and it's completely free, with no usage limits.