The Risk-Reward ratio is the capital you stand to lose (risk) in order to obtain a specific profit (reward).
If your Risk-Reward is 1:3 it means that you are willing to lose 1 in order to gain 3.
For instance, if you risk $1,000 then your expected return is $3,000.
The Win-Loss ratio, also known as success ratio, is instead the number of winning trades in respect to the number of losing trades.
In mathematical terms, the formula is the following.
Win-Loss = Winning Trades / Losing Trades
Assuming you made 30 trades of which 18 you won and 12 you lost, then your Win-Loss ratio is 18/12 or 1.5.
This means that you are winning 50% more trades than you are losing.
You can also easily derive your Win-Rate and Lose-Rate.
Win-Rate = 18/30 = 0.6 = 60% (you win 6 trades out of 10)
Lose-Rate = 12/30 = 0.4 = 40% (you lose 4 trades out of 10)
Summing things up…
The Risk-Reward ratio tells you how much you will earn based on how much you are willing to lose.
The Win-Loss ratio tells you how many times you will win in respect to how many times you will lose.