Enter balance, risk % and stop loss to get the correct lot size for any pair instantly.
30+Pairs
8Currencies
$0Cost
100%Free
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Position Size Calculator
Know your lot size
Lot Size
—
standard lots
Units
—
contract units
Dollar Risk
—
max loss at stop
Pip Value
—
per pip / 1 lot
Risk %:
→ 30 pips
⚠ Prop firm rules: Never risk more than 0.5–1% per trade on challenges. A $100k account with 5% daily limit gives only $5,000 buffer.
Position Size Calculator 1% Risk RuleProp Firm Safe Know Your Lot SizeFree Tool No Signup Required Position Size Calculator 1% Risk RuleProp Firm Safe Know Your Lot SizeFree Tool No Signup Required
How it works
The Formula
// Position Size Formula
// Lot size from balance & risk LotSize =
(balance×risk_pct) ÷ (stop_pips×pip_value)
// Pip value in account currency pip_value = pip_size×contract ÷quote_rate
Professional traders risk 0.5–2% per trade. For prop firm challenges, keep it at 0.5–1% to protect against hitting the daily drawdown limit with a losing streak.
How does stop loss distance affect position size? +
Wider stop = smaller lot size. Tighter stop = larger lot size. The dollar risk stays the same (e.g., $100) but distributes across more or fewer pips.
What if I trade on a non-USD account? +
Select your account currency in the dropdown. The calculator automatically converts pip values to your account currency so the result is always accurate.
Is this calculator accurate for metals and indices? +
Yes. For Gold (XAUUSD), Silver (XAGUSD), NAS100 and other instruments the contract sizes and pip values are factored in automatically.
Trade with precision.
Every pip, every lot, every trade — calculated before you click. Track it all in Profit Helper.