Lot Size Calculator: Position Sizing Tool
Lot size is calculated, not guessed. Once the amount you accept losing and your stop-loss distance are set, the appropriate position size is a single number.
Position Size Calculator
Recommended position size from your risk percentage and stop-loss distance.
Result: 0.33 lots
Calculations are estimates and not investment advice; they vary with broker conditions.
Risk warning. Leveraged forex trading carries high risk and, in Türkiye, is subject to SPK regulation (1:10 leverage cap, ~50,000 TRY margin). This content is not investment advice; user statements belong to their authors.
What the calculation rests on
The formula is simple: amount risked ÷ (stop-loss distance × pip value). The amount risked is the percentage of your balance you choose; pip value is set by trade size and the pair.
Example: a 10,000-unit balance, 1% risk per trade (100 units), a 30-pip stop and a pip value of 10 units → 100 ÷ (30 × 10) = 0.33 lots. Widen the stop to 60 pips on the same account and the position halves.
Why risk first, lot second?
Most people work in the opposite order: they ask "how many lots can I open", then work out how much they risked. The platform answers the first — as long as leverage permits, a large position is possible. The second should be answered by your own calculation.
The number of lots you open sets the margin reserved; as your margin level falls you move toward a margin call. So choosing a lot size is a risk decision and a margin decision at once.
What breaks the result
The calculation assumes your order fills exactly at the level you set. In reality slippage can shift it: a stop-loss executes at the first available price after the level is crossed. In thin liquidity, the real loss can exceed your calculation.
This calculation is an estimate and not investment advice; it varies with broker conditions, the pair and your account currency.