Spread cost calculator See what the bid-ask spread costs you per trade
The spread is the gap between the buy and sell price, and you pay it every single time you open a position — before the market moves at all. It’s easy to ignore because it isn’t billed as a fee. Put in three numbers and this tool shows what that spread actually costs you, in cash.
Enter positive numbers in every field.
How to use it
Take the spread for your pair — the difference between the buy (ask) and sell (bid) price, quoted in pips. Enter your trade size in lots, where one lot is 100,000 units. Then enter the pip value per lot: for a standard lot on most pairs that’s roughly 10 in the quote currency, but check the figure for your pair. The result is what crossing the spread costs you the moment you enter the trade.
What the result does and doesn’t mean
The figure is the cost of the spread alone, in the quote currency, paid on entry — it does not include commissions, swaps, or any other charge your broker adds on top. It’s also only as accurate as the pip value and spread you type: this tool does nothing but arithmetic on your inputs. It holds no live spreads and makes no promises about what you’ll actually be quoted.
Spreads widen when the market is thin or moving fast — around news, at the session open, or on exotic pairs. The tight number you see in calm conditions is not what you’ll always pay, so treat this as a best-case estimate, not a guarantee.
The formula, in plain words
The tool multiplies three things: the spread in pips, the pip value per lot, and your trade size in lots. Spread times pip value tells you what crossing the spread costs on one lot; multiply by the number of lots and you have the cost for the whole position. It’s the same money you’d lose if you opened and instantly closed the trade with no market movement — the built-in cost of entry, paid once, up front.
A worked example
Take a 1.2-pip spread, one standard lot, and a pip value of 10 in the quote currency. Multiply 1.2 × 10 × 1 and the spread costs you 12.00 on entry. Trade three lots instead and it’s 36.00; the cost scales straight with size. Now picture a scalper doing that 1.2-pip round trip twenty times a day at one lot: 12.00 a trade is 240.00 in spread alone before a single winning tick, which is why frequency turns a “tiny” spread into the dominant line on the account. On a wider pair quoting a 3-pip spread, the same one-lot trade costs 30.00 — two and a half times more, for doing nothing different.
When this number matters — and when it doesn’t
Spread cost matters most to anyone who trades often or on a short time frame, because it’s charged per entry and adds up with turnover rather than with time held. It matters far less to someone opening a handful of positions a year, where swaps or the underlying move dwarf it. Two caveats. The figure is the spread alone, in the quote currency — it leaves out commission, overnight swaps and any other charge your broker stacks on top, so it’s a floor on trading cost, not the total. And it’s a best-case number: it assumes the tight, calm-market spread you typed, not the wider one you’ll meet around news or at a thin session open. Feed it the spread you actually see at the time you trade, not the marketing figure.
Common mistakes
- Using the advertised “from” spread instead of the live one, which is usually wider when it counts.
- Treating the spread as the total cost and ignoring commission and overnight swaps layered on top.
- Forgetting that the cost multiplies with trade frequency — a small spread paid often is a large bill.
- Mixing up the pip value’s currency with the account currency, so the cost looks smaller or larger than it is.
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