Free tool
Lot size calculator
Find the position size that risks exactly the amount you choose if your stop loss is hit.
Rounded down to the nearest 0.01 lot so you never risk more than planned.
Conversions use reference rates from 6 October 2026. Your broker’s live prices will differ slightly.
Why size from the stop loss
Choosing a lot size first and a stop second means your risk changes with every trade. Fix the money at risk first, then let the stop distance decide the size: wide stops get smaller positions and tight stops get larger ones. Every loss then costs the same share of your account. Read more in lot sizes explained and risk management.
Using it with a signal
Take the distance between the signal’s entry and stop loss in pips, enter it above, and the calculator gives the size for your account. Our guide to reading a forex signal walks through a full example.
FAQ
What is the formula for lot size?
Lot size = (account balance × risk %) ÷ (stop loss in pips × pip value per standard lot). For example, $5,000 × 1% = $50 risk; with a 25-pip stop on EUR/USD at $10 per pip per lot, 50 ÷ 250 = 0.20 lots.
How much should I risk per trade?
Many traders risk between 0.5% and 2% of their account per trade. Lower risk means a losing streak does far less damage. See our risk management guide.
Why does the calculator round down?
Brokers accept sizes in steps of 0.01 lots. Rounding down keeps your loss at or below your chosen risk; rounding up would exceed it.
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