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Position Size Calculator

How many lots to trade so a stop-out costs only your planned risk.

A $10,000 account risking 1% with a 20-pip stop on EUR/USD should trade 0.500 standard lots (50,000 units). The math: $10,000 × 1% = $100 of risk, divided by ($10 pip value × 20 pips) = 0.5 lots. Halve the risk percentage or double the stop distance and the position size halves with it.

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Risk amount
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Pip value (per standard lot)
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Position size
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In units
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How position sizing works

Risk-based sizing keeps a single losing trade from blowing up your account. The formula:

lots = (balance × risk%) ÷ (pip_value_per_lot × stop_pips)

Pip value depends on the quote currency of the pair and your account currency. For EURUSD with a USD account, one pip per standard lot is exactly $10. For EURJPY with a USD account, one pip is 1,000 JPY per lot — converted to USD using the current JPY→USD rate.

This calculator pulls daily FX rates from the European Central Bank via frankfurter.dev. For intraday accuracy on volatile crosses, treat results as a tight estimate, not a tick-precise quote.

Standard lot sizes

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