Your lot size is the money you are prepared to lose divided by what the stop costs for one lot. The money at risk is the account size multiplied by your risk percentage; the cost per lot is the stop in pips multiplied by the pip value of one lot. Sizing this way keeps every loss the same size no matter how wide the stop is, which is what lets a strategy survive a losing streak. Work out the pip value first with the pip calculator, then check where the resulting position lands against your exposure cap with the risk calculator.
Tools
Lot size calculator
Your account, your risk, your stop. The exact number of lots that keeps the loss where you decided it should be.
Lot sizeLive
Lot size—
Amount at risk—
Position size (units)—
Of the daily limit—
Cost per pip—
The daily limit reading uses the tightest published daily loss limit, 3% on Instant plans.
Size is a decision you make once
A trader who picks a lot size by feel is running a different risk on every trade, which means one bad day can undo ten good ones. Fixing the percentage and letting the stop decide the size is what makes a run of losses survivable, and it is the single habit that separates funded accounts from breached ones.
Amount at riskAccount size × your risk percentage. The most this trade can cost.
Cost per pipWhat one pip of adverse movement costs at the size shown.
Of the daily limitHow much of the 3% daily loss limit this single trade would use.
What 1% risk looks like
| Account | 1% risk | 20-pip stop |
|---|---|---|
| $5,000 | $50 | 0.25 lots |
| $10,000 | $100 | 0.50 lots |
| $25,000 | $250 | 1.25 lots |
| $50,000 | $500 | 2.50 lots |
| $100,000 | $1,000 | 5.00 lots |
How it works
How the size is worked out
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