Forex Position Size Calculator
Position sizing is the part of risk management you control before every trade. This Forex Position Size Calculator works out how large a position to open so that, if your stop-loss is hit, you lose only the percentage of your account you intended to risk — no more. Enter your account balance, the percentage you want to risk, your stop-loss distance in pips, and the pip value, and the calculator returns your size in both standard lots and units.
It is account-currency agnostic but defaults to a GBP account. The result is computed entirely from your own inputs in your browser — nothing is sent anywhere, and no figure here predicts or guarantees any trading outcome.
How to use it
- Account balance — the equity you are trading with, in your account currency.
- Risk per trade — the share of the account you will lose if the stop is hit. Many traders cap this at 1–2%.
- Stop-loss (pips) — the distance from entry to your stop, measured in pips.
- Pip value — how much one pip is worth per standard lot in your account currency. For pairs where the account currency is the quote currency this is fixed; otherwise it moves with the exchange rate, so use your platform's figure for precision.
The amount you risk in money terms is account × risk%. Divide that by stop pips × pip value to get lots, then multiply by 100,000 for units.
FAQ
What is a pip?
A pip is the standard smallest price increment for a currency pair — for most pairs the 4th decimal place (0.0001), and for JPY pairs the 2nd decimal place (0.01).
How much should I risk per trade?
That is a personal risk decision. A common, conservative convention among retail traders is 1–2% of the account per trade, but the right number depends on your strategy and tolerance. This tool does not advise a figure.
Why does pip value change?
When your account currency is not the quote currency of the pair, the pip's worth in your currency depends on the current exchange rate, so it varies slightly trade to trade.
Does a correct position size guarantee I won't lose more than my risk?
No. Gaps, slippage and weekend moves can cause your realised loss to exceed the modelled stop. Position sizing manages risk; it does not remove it.
Is this connected to my broker?
No. Everything is calculated in your browser from the numbers you type.
See also the free trading tools hub and please read our risk disclosure.