Forex Lot Size Calculator
Turn account risk and stop distance into forex lot size.
Plan the order before you place it.
- 100% Free
- No Signup
- Works Everywhere
How it works
1. Define account risk
Set the balance and percentage you are prepared to lose.
2. Add stop and pip value
Use the stop distance and pip value for one full lot.
3. Calculate lots
Risk divided by stop cost per lot gives the theoretical lot size.
Review forex risk in Forgalis
Plan the forex position here.
Review whether your real trades respected that risk inside Forgalis TradingJournal.
Transparent formula
How forex lot size is calculated
The calculator requires the pip value for 1.00 lot to already be expressed in the selected account currency.
Calculate the risk amount
Risk amount = balance × risk %$10,000 × 1% = $100
Calculate the stop cost per lot
Stop cost = stop pips × pip value25 × $10 = $250 per lot
Calculate lot size
Lot size = risk amount ÷ stop cost$100 ÷ $250 = 0.40 lots
Convert lots to units
Units = lot size × contract size0.40 × 100,000 = 40,000 units
This calculator does not fetch live exchange rates. Enter the correct pip value in your account currency or use a dedicated pip value calculator first.
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View embed codeCommon Questions
What pip value should I enter?
Enter the value of one pip for 1.00 lot in your account currency. Use the pip value calculator or your broker specification when unsure.
Why can pip value change?
Pip value can depend on the currency pair, lot size, account currency and current exchange rate.
Should the calculated lot size be rounded?
The result is theoretical. Round down to an increment your broker accepts if you need to avoid exceeding the planned risk.
Does this include spread and commission?
No. Spread, commission, swaps and slippage can increase the real loss beyond the stop-loss calculation.