What maximum lot size should a challenge allow?
Quick answer
Set maximum lot size relative to account size and your loss limits, so a single order cannot risk an extreme share of the account. Many firms cap lots per order or total open lots per account. The cap should still allow normal position sizing for the strategies you want to attract.
Detailed answer
Ways to cap size:
- Per order: no single order above a set number of lots.
- Total open lots: the sum across positions.
- Risk per trade: loss at the stop loss limited to a percentage of the balance.
The risk-per-trade approach scales naturally with instruments of different value per lot.
PropExecutor offers all three: max lot per order (core), max total open lots and max risk per trade (advanced). Max risk per trade refuses any order whose loss at its stop would exceed a set percentage of the starting balance, and refuses orders without a stop loss, since their risk cannot be measured.
Worked example
A firm offers $25,000 accounts with a 5% daily limit ($1,250). With a 20-pip stop on EUR/USD, 6 lots would risk $1,200 on one trade. A cap of 5 lots keeps any single trade below the daily allowance, while still allowing normal sizes.
PropExecutor team · Updated
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