Position Size & Lot Size Calculator
Calculate exact Forex standard lots, crypto units, and maximum capital at risk before opening any market order.
Equivalent to 50,000 units of EUR.
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Scan Chart on TerminalHow Professional Traders Calculate Position Size
Position sizing is the single most important factor determining whether a trader survives losing streaks or blows an account.
The 1% Maximum Loss Rule
Never risk more than 1% of total account capital on a single setup. This ensures that even after a string of 10 consecutive losses, your account drawdown remains under 9.6%.
Let Stop Loss Dictate Lots
Never use fixed lot sizes (like always trading 1.0 lot). Adjust your lot size dynamically so that whether your stop is 15 pips or 50 pips, the dollar loss remains identical.
Prop Firm Drawdown Protection
FTMO, Topstep, and FundedNext evaluate risk discipline. Keeping trade sizing capped at 0.5%–1.0% prevents sudden daily limit triggers caused by slippage or high-spread news spikes.
Need to Calculate Your Win Rate & Profit Multipliers?
Use our companion Risk to Reward calculator to evaluate multi-target profitability.