Forex Position Size Calculator
Get your exact lot size for any major forex pair. Choose the pair, enter your account balance, risk percentage, entry, and stop loss — the calculator handles pip values and currency conversion automatically.
Results
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How forex position sizing works
In forex, position size is expressed in lots: a standard lot is 100,000 units of the base currency, a mini lot is 10,000, and a micro lot is 1,000. Your lot size determines how much each pip is worth — on EUR/USD, one pip is worth $10 per standard lot, $1 per mini lot, and $0.10 per micro lot.
To size a trade you need three steps: decide your risk in money (balance × risk %), measure your stop loss in pips, then divide risk by (pips × pip value). The calculator performs all three steps and converts the pip value into your account currency when needed — for example when trading USD/JPY with a EUR account.
Pip values and currency conversion
A pip is 0.0001 for most pairs and 0.01 for yen pairs. The pip value is always expressed in the quote currency — the second currency of the pair. If your account currency differs, the pip value must be converted: a standard lot of USD/CHF is worth 10 CHF per pip, which is roughly $11 at a USD/CHF rate of 0.90.
This calculator pulls daily ECB reference rates for fiat conversion and always lets you override the rate manually.
Choosing a stop loss before a lot size
Position sizing only works if the stop loss comes first. Pick the stop from the chart — a support level, an ATR multiple, a structure break — then calculate the size. Traders who pick the lot size first and the stop second are sizing by hope, not by risk.
Frequently asked questions
How do I calculate lot size in forex?
Lot size = (account balance × risk %) ÷ (stop loss in pips × pip value per lot). For a $10,000 account risking 1% with a 50-pip stop on EUR/USD: $100 ÷ (50 × $10) = 0.20 standard lots.
What is a standard, mini, and micro lot?
A standard lot is 100,000 units of the base currency, a mini lot is 10,000, and a micro lot is 1,000. On EUR/USD each pip is worth $10, $1, and $0.10 respectively.
Why does my account currency change the lot size?
Pip value is denominated in the pair's quote currency. If your account is in EUR and you trade USD/JPY, the 1,000 JPY pip value per lot must be converted to EUR before sizing. Different account currencies produce different correct lot sizes for the same trade.
Can I use this for gold (XAU/USD)?
Yes, but use the dedicated metals calculator instead. Gold uses a 0.01 pip size and a 100-ounce standard lot, so a 0.01 pip is worth $1 per standard lot. Enter the USD conversion rate manually if your account is not in USD.
Is 1% risk per trade enough for forex?
For most traders, yes — 1% keeps a 10-loss streak under 10% of the account even before compounding effects. Scalpers with high win rates sometimes use up to 2%, but rarely more.