All lessons
Scaling in and out: do the cash-risk maths
Taking some profit feels good. Check what happens to the rest of the plan.
Calculate partial exits and distinguish adding size from reducing exposure.
Scaling out closes part of a position while leaving the rest open. It changes the average realized outcome; it does not automatically increase expected profitability.
Scaling in adds units and can increase total loss at the shared stop. Recalculate every open unit's entry-to-stop exposure rather than counting only the new ticket.
Partial profits may reduce exposure but also reduce the payout of a full trend winner. Compare a fixed-size exit and the partial rule over identical paths.
Record quantities, prices, remaining stop and costs after each change. A position can be gross-price breakeven while its total execution costs remain positive.
Let’s work through it
- Write quantities and prices
- Recalculate remaining risk
- Compare complete path outcomes
Let’s use numbers · hypothetical example
Ten units long 100 with stop 98 risk 20 cash units if each point per unit is 1. Close five at 104: realized gain 20. If remaining five exit 100, combined gross gain 20; if they exit 106, total gross gain 20+30=50. A full ten-unit exit 106 would gain 60.
Easy mistakes to watch for
- Partials always improve expectancy
- Ignoring added-unit risk
- Treating realized profit as free risk
Keep in mind
Minimum order size, partial-fill behavior and per-order fees can make a small partial plan impractical.
Your turn
Calculate the same partial exit for a losing final leg. Compare total outcome with a single exit.
A quick check before we move on
In the example, five units at 104 and five at 106 produce what gross gain?
- 60
- 40
- 50
Check answer
50 The first five earn 5×4=20; the remaining five earn 5×6=30; total 50 before costs.
Sources and further reading
- www.cmegroup.com/education/courses/building-a-trade-plan/risk-management-and-your-trade-plan
- www.cmegroup.com/education/courses/trade-and-risk-management/proper-position-size
Content reviewed: 29 October 2026
Educational material with hypothetical examples. Trading can cause substantial losses. A course, pattern, stop order or past result cannot guarantee a profit or limit every loss. Practise in simulation and check current rules and product terms in your jurisdiction.
