A worked size from a cash figure and an eight-point stop

Take a student who has decided, before looking at today’s chart, that the risk unit on this idea is 2,000 baht. That figure might be half a percent of a cash pile they are willing to mark, or a number they can lose without touching rent. The source of the 2,000 matters less than the fact that it was chosen first.

The chart, in this example, shows a long idea whose swing low sits eight points below the price where an order could be placed. Assume, only for the lesson, that one unit of the instrument gains or loses 25 baht when price moves one point. The stop distance in money is 8 × 25 = 200 baht per unit.

Size is risk unit divided by money per unit: 2,000 / 200 = 10. Ten units. If the contract only trades in whole units, ten stands. If the division had produced 10.7, the studio rounds down to 10. Rounding up spends risk the student did not agree to.

Change only the chart. Suppose the swing low is twenty points away, not eight. Money per unit at the stop becomes 500 baht. Size becomes 2,000 / 500 = 4. Same risk unit, wider structure, smaller position. The student who keeps ten units on both ideas is risking 5,000 baht on the second one and calling it the same trade.

We use this pair of examples on evening three because the arithmetic is short and the habit it corrects is stubborn. Bring your own point value. The tutor will not supply a “typical” one from memory if your contract specification differs.

The Chart Risk Studio is where this measurement is practiced out loud. All desk notes