The lot size calculator determines the correct number of lots to trade in any forex position. Unlike generic position size calculators, this tool is specifically built for forex lot sizing, letting you choose between standard lots (100K units), mini lots (10K units), and micro lots (1K units) with live pip value calculations. Choosing the wrong lot size is a critical mistake that new forex traders make constantly — trading too large relative to account size turns normal market fluctuations into account-threatening losses.
This free lot size calculator works directly in your browser — no download, no registration, and no delay. All calculations are performed client-side, so your trading data is never transmitted to a server.
The formula used is: Lots = (Account Balance × Risk %) ÷ (Stop Loss Pips × Pip Value per Lot). This is the same formula used by professional traders and institutional risk managers worldwide.
Supported asset classes include: Forex. Each asset class applies the correct unit conventions so results are always accurate regardless of the market you are trading.