Lot size calculator

Enter your balance, the percentage you want to risk and your stop loss distance. We will give you the exact lot size so that, if the stop is hit, you lose only what you planned.

Result

Fill in the fields with valid values to see the result.

Recent calculations

    Educational tool. Results are indicative and are not financial advice. Always verify values with your broker.

    Next step

    Continue your trading plan with these tools:

    Risk/reward calculatorMeasure the R:R ratio, the win rate you need and your mathematical expectancy.Margin and pip value calculatorCalculate required margin, pip value and the notional size of your position.Trading journalLog your trades and get statistics: win rate, profit factor and losing streak.

    How it works

    The position sizing formula

    Lot size is the money you accept to lose divided by what you lose per lot if price travels to your stop: lots = (balance × risk %) ÷ (stop pips × pip value per lot).

    Pip value per lot is the contract size × pip size, converted into your account currency. On EUR/USD with a USD account that is 10 USD. If the quote currency is not your account currency (for example USD/JPY on a USD account) it must be converted using the current exchange rate.

    Why it rounds down

    Brokers accept lots in fixed steps (usually 0.01). Rounding up would make you risk more than planned, so the calculator always rounds down and shows the resulting real risk.

    FormulaLots = (Balance × Risk %) ÷ (Stop in pips × Pip value per lot)

    Frequently asked questions

    What risk percentage should I use?

    There is no universal number. Many traders work between 0.5% and 2% of balance per trade so a losing streak does not wipe out the account. This is an educational reference, not personal advice.

    How much is a pip worth?

    It depends on the pair, the lot size and your account currency. On pairs where USD is the quote currency, a standard lot is worth 10 USD per pip. On JPY pairs the pip is 0.01 and the value is converted from yen.

    Why do I need a conversion rate?

    If the pair’s quote currency is not your account currency, the pip value has to be converted. When it can be derived from the pair’s own price we do it automatically; otherwise you can type it or fetch today’s rate with one click.

    Does it work with gold, indices or crypto?

    It includes gold (XAU/USD) and silver (XAG/USD). For any other instrument choose “Custom” and enter the contract and pip size your broker specifies.

    Will results match my broker?

    Contract size and pip definition can vary between brokers, especially on metals and indices. Check the instrument specifications on your platform before trading.

    Related guide

    How to calculate lot size in forex, step by stepLearn how to calculate the right lot size for every trade with real examples on EUR/USD, USD/JPY and gold.

    Related concepts

    Position sizingLotPipStop loss