Thinking in R strips account size out of the conversation and makes trades comparable across instruments and over time. A journal in R is a measurement system; a journal in dollars is a diary.
It also makes the arithmetic of a strategy obvious. Twenty trades at +0.3R average is +6R, which at 1% risk is roughly 6% - before fees, and before the drawdown you lived through to get it.
The mistake it causes: celebrating a large dollar win that was secretly a +0.4R trade taken at four times the usual size.
Why professionals stop counting in money
A $400 win taken at four times normal size is not better than a $100 win taken correctly, but a dollar-denominated journal says it is. Expressing results in R, multiples of the amount risked, puts every trade on the same scale across instruments, account sizes and time.
| Result | Meaning |
|---|
| −1R | Stopped out exactly as planned |
| −1.4R | Stopped out with slippage, or the stop was moved |
| 0R | Scratched at break-even |
| +2R | Made twice what the trade risked |
That second row is the one worth watching. A journal full of losses larger than −1R is not reporting bad luck, it is reporting a process problem: stops being widened, slippage not accounted for, or positions sized before the stop was decided.
R makes the arithmetic of a system obvious
Twenty trades at +0.3R average is +6R. At 1% risk that is roughly 6%, before fees, and it took twenty trades and whatever drawdown happened along the way. Seen in R, the claim "I made 6% this month" becomes checkable rather than impressive.
It also exposes size discipline
If one trade shows +4R while everything else sits between −1R and +2R, the question is not what went right. It is whether that position was four times the normal size, in which case the system has a variance problem that will eventually arrive in the other direction.
What to do with this
- Record every trade in R alongside the money. The R column is the one you review.
- Investigate any loss worse than −1R. There is always a reason, and it is usually procedural.
- Use R to compare strategies, never raw profit.
