Direct answer
Reward risk calculation in forex is a planning method that expresses a trade idea as a ratio of potential reward to potential risk. It is usually computed from price distances (for example, how many pips/points between an entry and a stop-loss versus between an entry and a target). The ratio helps you understand how much upside you are aiming for relative to how much downside you are trying to cap.
This calculation is not a guarantee of outcomes. It only summarizes the relationship implied by your chosen levels and position sizing assumptions; real results can differ because of costs (spreads/commissions), execution quality, and market movement.
Mechanics: definition and core inputs
A reward risk calculation typically starts with three predefined price levels:
- Entry price: where you assume the position is opened.
- Stop-loss level: the price level you assume caps the loss.
- Target (take-profit) level: the price level you assume you exit for a gain.
From these levels, you determine price distances:
- Risk distance = distance from entry to stop-loss.
- Reward distance = distance from entry to target.
Then you compute a reward-to-risk ratio:
- Reward/Risk = (Reward distance) / (Risk distance)
Important: the ratio is fundamentally geometric when expressed as distances. If both distances are measured in the same unit (for example, pips or points), the ratio does not require exchange-rate conversion by itself. However, once you translate distance into money (profit/loss in account currency), the outcome depends on position size and pip/point value, which vary by instrument and contract details.
If you do not use a target
Some traders discuss reward risk even without a fixed target, by using an assumed expected exit distance or by using alternative measures (for example, “reward potential based on a planned move”). In that case, you must treat the computation as an assumption-to-ratio conversion rather than a ratio derived from a fixed, executable target level.
Position sizing and money translation
The ratio can be computed from distances alone, but the monetary risk and monetary reward require:
- Lot size / position size
- Contract specifications for the traded forex instrument
- Pip (or point) value in the account currency
Once pip value is accounted for, you can estimate:
- Planned loss (money) = Risk distance × pip value × position size
- Planned gain (money) = Reward distance × pip value × position size
If your reward risk ratio is computed from distances, the money ratio usually matches the distance ratio if pip value is the same for both outcomes and you assume consistent execution.
Evidence via a worked example (with explicit assumptions)
Assume the following for an illustrative calculation:
- You plan a long position.
- Entry price: 1.2000
- Stop-loss: 1.1980
- Target: 1.2040
- You measure distance in pips, where 0.0001 = 1 pip.
Step 1: Compute distances.
- Risk distance = 1.2000 − 1.1980 = 0.0020 = 20 pips
- Reward distance = 1.2040 − 1.2000 = 0.0040 = 40 pips
Step 2: Compute the ratio.
- Reward/Risk = 40 / 20 = 2.0
Interpretation: your plan implies that the target is twice as far from the entry as the stop-loss is.
Step 3: Translate to money only if needed.
If you also compute profit/loss in account currency, you need the pip value for the instrument and your position size. Two different position sizes will scale both planned loss and planned reward proportionally, leaving the ratio unchanged—as long as pip value is consistent and execution matches assumptions.
Limitations and failure modes
Reward-to-risk calculation is helpful for structure, but it can fail in several material ways:
1) Costs and spreads
Forex execution often involves a spread between bid and ask. If you plan risk and reward using a single price reference, spreads can shift the actual realized entry/exit prices. This can reduce reward relative to your plan, or increase loss, even if the ratio from distances looks unchanged.
2) Slippage and price gaps
If price moves quickly, execution may occur worse than expected. A stop-loss might be triggered at a different effective price than the level used in your distance calculation, and the realized risk can exceed the planned risk distance.
3) Measuring distances with inconsistent conventions
Distance must be measured consistently:
- Long vs. short trades use direction differently.
- You must apply the correct sign convention so risk distance is positive.
- You must ensure the units match (pips vs points vs decimals).
If you mix conventions, the computed ratio may be mathematically correct under one convention but not under your intended meaning.
4) “Planned” levels vs. “actually” executed levels
Reward risk calculation is only as accurate as its assumptions about:
- where the trade opens
- how the stop triggers
- where the exit happens
If the market path causes earlier exits (for example, partial fills, manual adjustments, or changes to stop/target), the realized reward/risk relationship may no longer match your initial computation.
Verification and a simple control point
To independently verify your reward risk calculation:
- Write down your assumptions: entry, stop-loss, target, and the unit used to measure distance.
- Recompute distances: confirm risk distance and reward distance using the same unit and direction logic.
- Check the ratio: verify Reward/Risk = reward distance ÷ risk distance.
- Decide whether you need money estimates: if yes, confirm pip/point value and position sizing consistency.
Control point: if you change any one of the three levels (entry, stop-loss, or target) while keeping units consistent, the ratio should change in a predictable way—smaller risk distance increases the ratio; smaller reward distance decreases it.
What to ask next
If you want to use reward risk more effectively for understanding uncertainty, focus your next check on the gap between planned and executable levels: costs, execution slippage, and how your platform represents stop and target behavior. Reward risk calculation can structure the plan, but verification must address execution realities.