Lot Size & Profit Calculator
Know your exact position size and dollar risk before you enter. Free, no sign-up. Works for forex, indices, gold, crypto and CME futures.
Pips mode works for all forex pairs, including crosses like EUR/JPY. For indices, crypto and commodities, use the Entry/Exit Price method. Always verify the contract size in your trading platform, as values differ between brokers.
How the lot size formula works
Position sizing answers one question: how big can this trade be so that hitting your stop loss costs exactly the amount you planned to risk, and nothing more. The formula is:
Say you trade a $10,000 account and risk 1% per trade, so $100. Your EUR/USD setup has a 25-pip stop loss, and one standard lot of EUR/USD moves $10 per pip. That gives $100 ÷ (25 × $10) = 0.40 lots. If price hits your stop, you lose $100, exactly the amount you planned for.
Sizing every trade this way is what keeps one bad setup from undoing a week of good ones. It matters even more on prop firm accounts, where a single oversized loss can breach a daily drawdown limit and end the challenge.
Calculator FAQ
How does the lot size calculator work?
It takes your account balance, the percentage you want to risk, and your stop loss distance, then returns the exact position size that keeps a losing trade inside that risk. Currency conversions (e.g. JPY or GBP quoted pairs) are handled automatically using live market prices.
What is the formula for position size?
Lot size = risk amount ÷ (stop loss in pips × pip value per lot). The risk amount is your balance × risk percentage. Example: on a $10,000 account risking 1% with a 25-pip stop on EUR/USD ($10 per pip per standard lot), the size is $100 ÷ (25 × $10) = 0.40 lots.
Which method should I use: Pips or Price?
Use 'By Pips' for any forex pair (majors, minors and crosses). Use 'By Price' for indices, crypto and commodities, or whenever you already know your exact entry and stop loss levels.
Does it work for gold, indices and crypto?
Yes. It supports XAU/USD, US30, NAS100, DAX, BTC/USD and more, plus CME futures like MNQ, ES, NQ and GC. For non-forex instruments, use the Entry/Exit Price method and double-check the contract size against your broker's specification.
Is this calculator accurate for prop firm accounts?
Yes. Position sizing works the same on funded accounts — it's the fastest way to stay inside daily drawdown limits. Just make sure the contract size matches your prop firm's platform (100,000 for standard forex lots on most MT4/MT5 brokers).
How much should I risk per trade?
Most professional traders risk between 0.5% and 2% of their account per trade. At 1% risk you can lose 10 trades in a row and still keep 90% of your capital, which is what lets a real edge play out over time.
Are the prices real-time?
Yes. Conversion prices are fetched live when the page loads, so the pip value used for cross pairs (like EUR/JPY or GBP/AUD) reflects the current market.
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