Before a trade earns anything, price has to move far enough to pay for the trade itself. That distance is your break-even, and it is almost always larger than people expect, because the costs are paid on both entry and exit. The break-even calculator turns those costs into a single, concrete number: how far price must travel just to leave you flat.
Why break-even is not zero
It is tempting to think a trade is profitable the moment price ticks past your entry. It is not. You have already paid fees and crossed the spread to get in, and you will pay fees and cross the spread again to get out. Until price covers all of that, plus any slippage, the trade is still underwater. Break-even is the point where it finally reaches even.
Step by step
- Enter the round-trip costs. Add the fees, spread, and slippage you expect to pay entering and exiting the position — both sides, not one.
- Add the safety buffer. Include a margin for uncertainty so the break-even is honest rather than optimistic, especially in volatile conditions.
- Read the break-even move. The tool returns how far price must travel just to cover cost — the point where the trade is merely flat, not yet a winner.
- Compare to your target. If your realistic target barely clears break-even, the trade is asking you to take risk for almost no reward.
What the number is really telling you
A large break-even relative to your expected move is a warning, not a detail. It means costs dominate the trade and the edge is thin — exactly the kind of setup the cost-beating rule rejects. Computing break-even before you trade lets you filter out those trades yourself, before friction does it for you on the way to a loss.
This is the same cost model behind the trading cost calculator, and the break-even feeds straight into sizing a position from your risk limit. For why an edge that barely clears break-even gets rejected, see the signals pillar.