Gold EA Lot Size: Fixed Lots or Percent Risk?
TL;DR Fixed lots trade the same size forever: predictable, and gradually wrong as the balance changes. Percent risk recalculates from balance and stop distance, so the dollar risk stays constant - which is what a risk plan actually means. Percent risk is the better default; fixed lots are for testing and for accounts too small to size properly.
What the two settings really do
Fixed lot means the EA opens 0.05 lots whether the account holds $500 or $5,000, and whether the stop is $2 or $12 away. The size is a constant; the risk is whatever falls out of it.
Percent risk inverts that. You fix the risk — say 1% of balance — and the EA solves for the size using the stop distance on that trade. The size varies; the risk does not.
Only one of those matches how a risk plan is normally described. "I risk 1% per trade" is a percent-risk statement, and running it as a fixed lot means it is only true on the day you set it.
What fixed lots do over time
Take 0.05 lots on a $1,000 account with a $4 stop. The risk is $20, or 2%.
Double the account to $2,000 and the same setting risks 1% — the EA has quietly become more conservative than intended. Halve the account to $500 and it risks 4%, exactly when the account can least afford it.
That is the structural problem with fixed lots: risk drifts in the wrong direction. It falls when you are winning and rises when you are losing.
Where percent risk goes wrong
Percent risk is the better model, but it has failure modes of its own, and they are worth knowing before you trust it:
- Tiny accounts hit the broker minimum. 1% of $200 with a $5 stop calls for 0.004 lots. The minimum is 0.01, so the EA either refuses to trade or rounds up and risks 2.5%. Rounding up is the dangerous default.
- Stop distance of zero. Strategies without a fixed stop have nothing to divide by. Some EAs fall back to a default lot that has no relationship to your risk setting.
- Balance or equity? Sizing from balance ignores open losses; sizing from equity shrinks positions during a drawdown. Equity is the more defensive choice, and worth checking which one your EA uses.
The setting that undoes the plan
Many gold EAs ship with a lot multiplier, a recovery mode, or a grid step that opens additional positions after a loss. Each of those bypasses the sizing logic entirely.
A 1% risk setting with a 2x multiplier after a loss is not a 1% plan. Four losses in and the position is sixteen times the first one — the risk setting is still displaying 1% while the account is exposed to far more. Our guide on EA strategy types covers what martingale and grid do to a balance in detail.
If an EA has these switches, know their state before you fund it. They are usually on.
How to set it, in order
- Decide the risk per trade as a percentage. One per cent is a sensible default and two is an aggressive one.
- Confirm the EA sizes from equity, not balance, if it offers the choice.
- Check the broker minimum lot against what your balance and stop distance actually produce. If they collide, the account is too small for that stop, not the stop too big for the account.
- Turn off any multiplier or recovery mode until you have watched the EA trade without it.
- Verify with the lot size calculator: enter your balance, risk and stop, and compare its answer to the size the EA actually opens.
Step five is the one people skip, and it is the one that catches configuration errors before the market does.
Questions we get
Should a gold EA use fixed lots or percent risk?
Percent risk for a funded account, because the dollar risk stays constant as the balance moves. Fixed lots are useful for testing and comparison runs, where you want the size held still while something else changes.
What lot size should a gold EA trade on a $1,000 account?
It depends on the stop distance, not the balance alone. At 1% risk with a $4 stop the answer is about 0.025 lots, rounded down to 0.02. A wider stop means a smaller size for the same risk.
Should an EA size from balance or equity?
Equity is the more defensive choice, because it accounts for open losing positions and shrinks new trades during a drawdown. Sizing from balance keeps opening full-size trades while the account is already under water.
Why does my EA open a bigger lot than I set?
Usually a lot multiplier, recovery mode or grid step that adds positions after a loss, overriding the risk setting. Rounding is the other cause: if the calculated size falls below the broker minimum, some EAs round up instead of skipping the trade.
Is 1% risk per trade safe for a gold EA?
It is a reasonable default, but safety depends on how many positions the EA holds at once. Five open trades at 1% each is a 5% exposure, not 1%, and gold can move all of them together.
Want the sizing checked before you go live?
Tell us your balance, risk setting and stop distance and we will confirm what the EA should be opening.
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