Can I limit lot size per trade?
Quick answer
Yes. The maximum lot per order rule refuses, or flags, any single order larger than a set number of lots. It is in the core catalogue on every plan. For limits on total exposure, the advanced catalogue adds maximum total open lots and maximum risk per trade.
Detailed answer
Lot limits stop a single order from taking an outsized share of the account's risk.
Maximum lot per order (core)
- Refuses any order above the limit, for example 5 lots.
- Action: reject order (default) or flag.
Maximum total open lots (advanced)
- Refuses an order that would take the sum of open lots above the limit.
Maximum risk per trade (advanced)
- Refuses an order whose loss at its stop loss would exceed a set percentage of the starting balance.
- Refuses orders without a stop, because their risk cannot be measured.
- Scales automatically across instruments with different contract sizes.
Choosing between them
A lot cap is simple but treats a lot of EUR/USD and a lot of gold the same, although their risk per point differs. Risk per trade adapts to each instrument. Many firms combine a generous lot cap with a risk-per-trade limit.
Different sizes for different accounts
Use separate rule sets, or rely on risk per trade, which already scales with the starting balance.
PropExecutor team · Updated
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