How it works
A standard forex lot commonly represents 100,000 units, but contract size is configurable here. Never assume a crypto or other CFD uses the same lot convention as forex.
The formula
Keep currency, units and time periods consistent. Percentage inputs use percentage points (enter 5 for 5%). Results are rounded only for display; tiny nonzero values may use scientific notation. Undefined ratios are shown as unavailable.
$10,000 balance, 1% risk, 50 stop pips and $10 pip value per standard lot give 0.20 lots. A 100,000-unit contract gives 20,000 units, $2 per pip and $100 risk at the stop.
Calculation method
Enter the pip value per full lot from your broker. If it is already in account currency, use conversion rate 1. Otherwise enter account-currency units per unit of pip-value currency. Pair labels do not fetch a conversion rate.
Interpretation
Lot size rounds down to the broker’s increment. If the broker minimum would exceed the selected loss budget, the tool reports no compatible size. This calculation does not include spread changes or execution slippage.
Method and reference sources
Method and content checked 2026-09-20. These sources provide background, not endorsement or professional certification. The formula and limitations above define this calculator.
- CME Group — Calculating futures profit or lossContract size and price-movement context; verify your broker or exchange specification separately.
- Investor.gov — Understanding FeesInvestment fee and compounding context; enter the terms of your fund or account.
Frequently asked questions
Can I reuse pip value across all currency pairs?
No. Pip size, contract size and account-currency conversion matter. Use your broker specification and a conversion rate appropriate to the calculation.
What is a worked example for Forex Lot Size?
$10,000 balance, 1% risk, 50 stop pips and $10 pip value per standard lot give 0.20 lots. A 100,000-unit contract gives 20,000 units, $2 per pip and $100 risk at the stop.