How the break-even calculator works
Every stock trade has a hidden threshold: the exact break-even price at which selling stops being a loss and starts being a profit. That threshold isn't simply your buy price — it's your buy price adjusted upward to cover whatever fees you paid to open the position and whatever fees you'll pay to close it. This calculator finds that number for you directly, so you know precisely what price to watch for before you decide to sell.
The math works in two steps. First, it calculates your total cost: the buy
price multiplied by the number of shares, plus any fee charged on the purchase. This is the true
amount of money that left your account. Second, it solves for the sell price that would make
your total proceeds — sell price times shares, minus the sell-side fee — exactly equal to that
total cost. Rearranging the algebra gives a simple formula:
Break-Even Price = (Total Cost + Sell Fees) / Shares. Any sell price above that
number is a profit; any price below it is a loss.
This number is especially useful for setting realistic expectations before you enter a trade, and for deciding whether a small bounce in price is actually enough to exit without a loss, or whether it just looks like one because you're eyeballing the raw buy and sell prices without accounting for fees.
Worked example
Suppose you buy 200 shares at $50.00 per share, paying a $6.95 commission on the purchase. Your broker will also charge $6.95 when you eventually sell.
Total cost = (200 × $50.00) + $6.95 = $10,000.00 + $6.95 = $10,006.95
Break-even price = ($10,006.95 + $6.95) / 200 = $10,013.90 / 200 = $50.0695 per share.
In practice, that rounds to about $50.07. Notice how small the gap is relative to your $50.00 buy price — under a 0.14% move — because the position size here is large enough that two flat $6.95 fees barely register. On a much smaller trade, the same two fees would push the break-even price noticeably further from the buy price.
Why this matters more on smaller trades
Flat-dollar brokerage fees don't scale with your trade size, which means their impact on your break-even price is entirely a function of how much money (and how many shares) you put into the position. Buying 10 shares at $50.00 with the same $6.95-and-$6.95 fee structure means your break-even price jumps to roughly $51.39 — a much bigger 2.8% move required just to get back to even, compared to the 0.14% move needed in the 200-share example above. If you trade in small dollar amounts or frequently, it's worth running this calculator before every trade, and worth comparing brokers on fee structure if flat fees are regularly eating a meaningful chunk of your required price movement.
Using break-even to set a target sell price
Once you know your break-even price, it's a short step to setting an actual profit target: just
add your desired dollar profit to the total cost before dividing by shares. The formula becomes
Target Sell Price = (Total Cost + Sell Fees + Target Profit) / Shares. Using the
200-share, $50.00 example above (total cost $10,006.95), if you wanted to walk away with a clean
$1,000 profit rather than just breaking even, you'd need to sell at
($10,006.95 + $6.95 + $1,000) / 200 = $55.07 per share — about $5.00 above your
buy price, or a 10% move. Framing your exit price this way, as "buy price plus the move needed to
hit my actual profit goal," tends to produce more disciplined trading than watching the raw price
and guessing whether a move "feels" like enough.
Common mistakes to avoid
1. Assuming break-even equals your buy price
The single most common mistake is mentally treating the buy price as the break-even point and ignoring fees entirely. This leads traders to sell "at even" and still lock in a small real loss once both fees are accounted for. Always check the actual break-even price, not the buy price, before deciding a trade is a wash.
2. Forgetting the sell-side fee doesn't exist yet
It's easy to remember the fee you already paid to buy and forget the one you'll pay to sell, since it hasn't happened yet. Both fees reduce your real return, and the break-even formula only works correctly when both are included — leaving out the sell fee will understate your true break-even price.
3. Ignoring taxes and slippage on top of fees
This calculator handles brokerage fees, but two other real-world costs can push your effective break-even point even higher: slippage (the difference between the price you see and the price you actually get filled at, especially in fast-moving or thinly traded stocks) and taxes on any realized gain. Treat the number here as a fee-adjusted floor, not necessarily your final, after-tax break-even point.