How to use
- Enter the buy price, sell price and number of shares.
- Enter your broker's commission as a percentage and any minimum commission per trade (0 for commission-free brokers).
- Read the profit, return, break-even price and fee breakdown.
Options explained
- Commission
- Charged on both the buy and the sell as trade value × rate, but never less than the minimum you enter.
- Break-even price
- The sell price at which proceeds after selling fees equal what you paid including buying fees.
The arithmetic, with an example
Each side of the trade is charged commission as the larger of trade value × rate and the minimum commission. Cost is the buy amount plus its commission. Profit is the sell amount minus its commission minus cost, and Return is profit ÷ cost. Amounts are rounded to cents.
Take 100 shares bought at 50 and sold at 52, with Commission (%) set to 0.5 and Minimum commission set to 1:
| Item | Buy | Sell |
|---|---|---|
| Amount | 5,000.00 | 5,200.00 |
| Commission | 25.00 | 26.00 |
Cost is 5,025.00 and profit is 5,200 − 26 − 5,025 = 149.00, a return of 2.97%. Note the return is measured on cost including the buying fee, not on the 5,000 you spent on shares alone. The break-even sell price is 50.503, slightly above the buy price because both fees must be recovered.
The break-even price is rounded up to three decimals. When the percentage commission would come to less than the minimum, the minimum is used instead: 500 shares bought at 20 and sold at 22 with 0.1% and a minimum of 5 pay 10.00 and 11.00 in commission (both above the minimum), and break even at 20.041. With 10 shares at the same prices, 0.1% would be only 0.20 per trade, so each side pays the 5.00 minimum.
Frequently asked questions
I bought 100 shares at $10 and sold at $11 with no commission. What is my profit?
$100, a 10% return; the break-even price is $10.
Are taxes included?
No. Capital gains tax depends on your country and holding period; this shows profit before tax.
Are exchange and regulatory fees included?
No. Only the commission you enter is counted. In Chinese, the page also includes China A-share stamp duty and transfer fees.
Privacy
This tool runs entirely in your browser. Your files and text are processed on your device and are never uploaded to our servers.