What Is R-Multiple in Trading? (And Why It Changes Everything)
R-multiple is the single most important metric for evaluating your trading performance. Learn what it is, how to calculate it, and why dollar P&L lies to you.
Risk Management · May 8, 2026 · 6 min read
Most traders measure success in dollars. A $500 winning day feels great; a $200 losing day feels awful. But this way of thinking leads to some of the most destructive habits in trading — moving stop losses, overtrading, and blowing up accounts. R-multiple is the antidote.
What Is R?
R stands for risk. Specifically, 1R equals the exact dollar amount you risked on a trade — the distance from your entry to your stop loss, multiplied by your position size. If you entered at $100, placed your stop at $95, and bought 100 shares, then 1R = $500. That's your baseline.
Your R-multiple is simply how much you made or lost relative to that 1R unit. A trade that returned $1,000 when you risked $500 is a +2R trade. A trade that lost $250 when you risked $500 is a –0.5R trade. Simple.
Why Dollar P&L Misleads You
Say Trader A made $1,000 last month and Trader B made $300. Instinctively, Trader A seems better. But if Trader A risked $5,000 across their trades and Trader B only risked $600, the picture reverses completely. Trader A returned a miserable 0.2R on average per trade. Trader B returned 0.5R. Trader B has the stronger edge.
Account size distorts dollar P&L further. A $500 gain means something entirely different for a $10,000 account versus a $500,000 account. R removes all of this noise. 2R is 2R regardless of whether your account is $5,000 or $500,000.
The Expectancy Formula
Once you think in R, you can calculate your trading expectancy: the average R you earn per trade over a large sample. The formula is: Expectancy = (Win Rate × Average Win in R) − (Loss Rate × Average Loss in R). A system with a 40% win rate and an average winner of 3R against an average loser of 1R has an expectancy of (0.4 × 3) − (0.6 × 1) = 1.2 − 0.6 = +0.6R per trade. That's a highly profitable system even though it loses more often than it wins.
How to Use R in Your Journal
For every trade you take, record your entry, your stop loss, and your position size before you enter the trade. This locks in your 1R value. When the trade closes, divide your actual P&L by that 1R to get your R-multiple. Over 50–100 trades, your average R-multiple becomes your most reliable measure of edge. ScanTrade calculates this automatically from your entry, stop, and exit values so you never have to do the math manually.
The Mental Shift
When you think in R rather than dollars, two things happen. First, you stop caring whether a single trade made or lost $50 or $500 — you care whether it was a +2R or a –1R, because that's what tells you whether you executed your plan. Second, you stop moving stops. If you agreed to risk 1R and you move your stop to risk 2R mid-trade, you've already broken your system. R-multiples make that betrayal visible in your journal immediately.
Minimum Sample Size
One important caveat: R-multiple becomes meaningful only over a large sample. Fewer than 30 trades and you're in the realm of statistical noise. Most professionals recommend evaluating edge over at least 100 trades before drawing conclusions. This is why consistent journaling matters so much — you cannot improve what you cannot measure.
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