Forex Position Size Calculator
Find the exact lot size that keeps every trade inside your planned risk. Set your balance, risk percent, and stop-loss, and get the position size in seconds.
The total capital in your trading account.
How much of your balance you're willing to lose on this trade.
Distance from entry to your stop, measured in pips.
Value of one pip per standard lot ($10 for most USD-quoted pairs).
Risking $100.00 on a 20-pip stop sizes your trade at 0.50 standard lots.
For educational purposes only. Read our risk warning before trading.
How Position Size Is Calculated
First, work out the cash you're risking: balance times your risk percent. Then divide that by the cost of your stop-loss, which is the stop distance in pips multiplied by the pip value of one standard lot. The result is your lot size.
Pip Value Per Standard Lot
| Pair Type | Example Pairs | Pip Value / Standard Lot |
|---|---|---|
| USD-quoted majors | EUR/USD, GBP/USD, AUD/USD | $10.00 |
| JPY pairs | USD/JPY, EUR/JPY | ~$6.50–$7.00 |
| USD as base | USD/CHF, USD/CAD | ~$7.50–$10.00 |
| Cross pairs | EUR/GBP, GBP/JPY | Varies by quote rate |
Frequently Asked Questions
Many traders cap risk at 1–2% of their balance per trade. Keeping it small means a string of losses won't significantly damage your account, giving your strategy room to play out over many trades.
For most USD-quoted pairs like EUR/USD, one pip is worth about $10 per standard lot. JPY and cross pairs differ, so check your broker's contract specs and enter that exact figure for accurate sizing.
A standard lot is 100,000 units, a mini lot is 10,000 (0.1 lots), and a micro lot is 1,000 (0.01 lots). This tool shows both standard lots and units so you can place the order in your platform's format.
A wider stop needs a smaller position to keep the same cash risk, and a tighter stop allows a larger one. Sizing from the stop keeps your dollar risk consistent no matter how far away your stop sits.
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Related Reading
Go deeper on the market behind these numbers — strategy, risk and setup guides from our desks.
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