Risk/reward ratio determines whether a trading strategy is mathematically profitable. A trader with a 40% win rate can still profit consistently — if their average win is 3× larger than their average loss. Understanding R:R transforms how you evaluate setups, set targets, and ultimately build a profitable trading record.
Risk/Reward = (Target Price - Entry Price) ÷ (Entry Price - Stop-Loss Price)
Example: BTC at $80,000. Enter at $80,000. Stop at $78,000 (risk = $2,000). Target at $85,000 (reward = $5,000). R:R = 5,000 ÷ 2,000 = 1:2.5.
| Win Rate | R:R Needed to Break Even | R:R for Profitability |
|---|---|---|
| 60% | 1:0.67 | 1:1+ |
| 50% | 1:1.0 | 1:1.5+ |
| 40% | 1:1.5 | 1:2+ |
| 33% | 1:2.0 | 1:2.5+ |
| 25% | 1:3.0 | 1:4+ |
The key insight: you can be profitable trading with only a 33% win rate if your winners are consistently 3× your losers. Many successful trend traders are profitable with <40% win rates because they let winners run and cut losses quickly.
On Polymarket, the R:R is embedded in the price. Buying YES at 30¢ risks 30¢ to win 70¢ — a 1:2.3 R:R — but ONLY if your probability estimate is above 30% for this to be +EV. The Kelly Criterion calculator helps you calculate optimal position size given your probability estimate vs the market price.
Risk/reward ratio and expected value are two sides of the same coin. Expected value (EV) is the mathematical result of applying your probability estimate to the R:R of a trade:
EV = (Win Probability × Reward) − (Loss Probability × Risk)
A trade with 1:2 R:R is positive EV when your win probability exceeds 33.3%. A trade with 1:3 R:R is positive EV when your win probability exceeds 25%. This means higher R:R ratios give you more room to be wrong about your probability estimate and still profit. Professional traders use this as a buffer against overconfidence in their own estimates.
Example calculation on a Polymarket position:
Your planned R:R at entry should govern how you manage the trade afterward. Many traders correctly identify good R:R setups but then undermine them with poor management:
The discipline of honouring your original R:R plan is as important as calculating it correctly. A 1:2.5 R:R trade that you close at 1:1 due to impatience is functionally a 1:1 trade — much harder to profit from systematically.
Before entering any trade or prediction market position, answer these questions:
Traders who go through this checklist consistently find that many "obvious" trades don't actually meet minimum R:R requirements — and therefore shouldn't be taken. This discipline alone separates profitable from unprofitable retail traders over the long run.
The most powerful trades have asymmetric payoffs — situations where the downside is capped but the upside is theoretically large. In prediction markets, these typically arise when:
The Daily Edge engine specifically surfaces prediction markets with large gaps between AI-assessed probability and crowd price — exactly these asymmetric R:R opportunities, refreshed every morning.