Position Size Calculator

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

• Standard lot — 100,000 units of the base currency
• Mini lot — 10,000 units (0.1 standard lots)
• Micro lot — 1,000 units (0.01 standard lots)