Risk management basics: position sizing & R-multiples
Updated May 25, 2026
Risk first, profit second
Professional traders decide how much they're willing to lose before they think about how much they might make. A common rule is to risk a small, fixed slice of your account — often around 1% — on any single trade. The goal isn't to avoid losses, which are inevitable, but to make sure no one loss is big enough to matter.
Position sizing in practice
Position size falls out of two numbers: how much you're willing to lose on the trade, and the distance from your entry to your stop. If you'll risk $100 and your stop is $2 below your entry, you buy 50 shares. Widen the stop and you buy fewer shares; tighten it and you buy more. The dollar risk stays constant while the share count adjusts — that's the whole point.
Thinking in R-multiples
An "R" is simply the amount you risked on a trade — your one unit of risk. If you risk $100 and make $300, that's a +3R win; if you lose the full stop, that's -1R. Measuring results in R instead of dollars lets you compare trades of different sizes on equal footing and judge your edge over many trades rather than fixating on any single outcome.
Reward-to-risk and expectancy
Before entering, compare the distance to your target against the distance to your stop — the reward-to-risk ratio. A setup offering 3R of reward for 1R of risk can be profitable even if it loses more often than it wins. AlphaForecast forecasts give you the entry, target, and stop you need to calculate this ratio, and the events calendar helps you avoid sizing into a known catalyst. Size with discipline and the math works in your favor over time.