Forex Position Size Calculator — Lots Per Risk
Calculate exact forex position size in units, standard lots, mini lots, and micro lots based on your account currency, pair and stop-loss in pips.
At risk: 100.00 USD if the stop hits.
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Why forex position sizing has an extra step
Stock sizing is simple: risk in $ ÷ risk per share = number of shares. Forex adds a wrinkle: your pip value depends on the pair and your account currency. A pip on EUR/USD is worth more to a USD account than a pip on AUD/JPY (different quote currency, different cross-rate). This calculator does all the conversion for you.
The math behind it
Risk amount = account × risk %. Pip value per unit = pip-size × quote-currency-to-account-currency rate. Position size = risk amount ÷ (stop in pips × pip value per unit). The answer is in units (1 standard lot = 100,000 units), and the tool shows the equivalent in lots so you can plug it into your platform.
Starting out
If you're learning, use micro lots (1,000 units). Same skill set as standard lots, 1% the risk. Once you can execute consistently for 6 months you can scale up. Anyone telling you to start trading standard lots with a small account is selling you something.
A size in lots only becomes an amount of money once you know what a pip is worth for that pair, and the yen pairs are quoted differently enough to catch people out. The pip value calculator covers it.
How to use the Forex Position Size Calculator
Takes about a minute. No signup, no download, your data stays in your browser.
- 1Open the tool. Scroll up to the Forex Position Size Calculator above — it loads instantly in your browser, no install needed.
- 2Enter your values. The fields come pre-filled with realistic defaults so you can see how it works — replace them with your own numbers.
- 3Read the result. The output updates instantly. Copy or share it — nothing is uploaded to a server, everything stays on your device.
Frequently asked questions
Common questions about the Forex Position Size Calculator.
What does position size depend on?
Three things: how much you are prepared to lose on the trade, how far away the stop is in pips, and what a pip is worth for that pair at that size. Fix the first two and the third determines the size — the arithmetic runs in that order, which is why guessing a lot size first tends to produce a risk you did not choose.
Why does the stop distance change the size?
Because risk is the stop distance multiplied by the value per pip. A wider stop means each pip of it costs the same, so the position has to be smaller to keep the total the same. Widening a stop without shrinking the position increases the amount at risk proportionally.
Does a calculated size make a trade safe?
No. It makes the loss on one trade a number you chose rather than a number you discovered afterwards, which is a different thing. Leveraged foreign exchange trading carries substantial risk and can produce losses exceeding the amount deposited, and no sizing calculation changes that.
Why does my broker platform show a different figure?
Usually a difference in lot conventions, in the exchange rate used to convert pip value into your account currency, or in whether the platform includes spread in its calculation. Treat this as arithmetic to check against rather than as an authority over your broker figures.
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