Risk Reward Ratio Calculator

A 3:1 ratio means every winning trade pays you three times what a losing trade costs, so the math works out as long as you win at least 25% of the time. With a typical retail win rate of 40% to 50%, a 3:1 setup produces a healthy positive expectancy: 50% wins x 3R minus 50% losses x 1R is +1R per trade on average. At 2:1 you need at least 33.3% wins, at 1:1 you need 50%, and below 1:1 even a coin-flip win rate loses money. That is why most trading desks and prop firms use 3:1 as the screening floor for setups worth taking.

Never risk more than 2% of your trading account on a single trade. Most professional traders sit at 0.5% to 1% per trade. The math is brutal in the other direction: lose 10% of your account and you need an 11.1% gain to recover, lose 50% and you need a 100% gain. At 2% risk per trade, a 5-loss streak draws the account down only about 9.6%, well inside the range you can trade your way out of. At 10% risk per trade, the same 5-loss streak puts you down 41%, and most accounts never recover from that. Position sizing, not picking direction, is what keeps you in the game.

Break-even win rate is the minimum fraction of trades you must win for the strategy to come out flat after costs. The formula is 1 / (1 + risk-reward ratio). A 3:1 ratio needs 1 / 4 = 25%. A 2:1 needs 1 / 3 = 33.3%. A 1:1 needs 1 / 2 = 50%. A 0.5:1 needs 1 / 1.5 = 66.7%. Anything above the break-even line is positive expected value; anything below is negative no matter how good the setup looked. Compare your historical win rate to the break-even line for every system you trade. If you cannot clear the line, change the ratio, change the entry, or stop trading the setup.

Because asymmetric trades (where reward is several times risk) survive a low win rate and still compound. A trend follower running a 2.5:1 ratio at a 40% win rate produces an expectancy of about +0.4R per trade, which beats a scalper hitting 70% at 0.5:1 (+0.05R). Asymmetric setups also remove the psychological pressure to be right. You can be wrong 60% of the time and still get paid, which makes losses easier to take and far less likely to push you into revenge trades. Stan Druckenmiller, Paul Tudor Jones, and most well-known macro traders run win rates around 30% to 40% precisely because they only take trades with at least 3:1 or 5:1 payoff.

Yes. Van K. Tharp's book Trade Your Way to Financial Freedom (1998) ran a famous simulation: give 100 traders the same coin-flip system with a slight positive edge, but let each pick their own position size. Equity curves spread from blown-up accounts to multi-million dollar gains. The system was identical. Only the bet size differed. Entry signals, exits, indicators, all the parts of a strategy that get the most attention are downstream of how much you bet. A great system sized too large blows up. A mediocre system sized correctly compounds. This calculator gives you the share count that keeps every loss small enough to keep trading tomorrow, which is the only thing that matters in the long run.