Direct answer: how to calculate forex gain or loss
Forex gain or loss is the result of the exchange-rate change between your entry price and your exit price, expressed either as (1) pips or (2) monetary value in your account currency. In an average win/loss context, you first compute each completed trade’s result, then group profitable trades as wins and losing trades as losses.
Mechanics: the inputs and the calculation steps
A forex trade has an entry price and an exit price. The sign of the result depends on trade direction:
- Long (buy): profit if the price rises from entry to exit.
- Short (sell): profit if the price falls from entry to exit.
Step 1: calculate the price change
For a long position:
- Price change = Exit price − Entry price For a short position:
- Price change = Entry price − Exit price
Step 2: convert the price change into pips (pip-based gain/loss)
A pip is a standardized unit of price movement in forex. The exact pip size depends on the currency pair (for many pairs, one pip is 0.0001, but exceptions exist). With the pip size, compute:
- Pips gained/lost = Price change ÷ Pip size
Step 3: convert pips into money (account-currency gain/loss)
To express the result as money, you need position size (often called lot size) and a way to map pip value to your account currency. A common independent check is to ensure:
- Larger position size increases the monetary impact of the same pip move.
- If your account currency differs from the pip’s quote currency, an exchange-rate conversion is required.
A practical way to keep this verifiable is to use the formula structure:
- Monetary gain/loss = (Pips gained/lost) × (pip value per unit/lot) × (position units)
Step 4: classify wins and losses for average win/loss
After calculating each trade’s monetary (or pip) result:
- Win: trade result > 0
- Loss: trade result < 0
- Breakeven: trade result = 0 (usually excluded from averages)
Then compute:
- Average win = (sum of win results) ÷ (number of wins)
- Average loss = (sum of loss results) ÷ (number of losses)
These averages describe past outcomes only; they are descriptive statistics, not predictions.
Example and checks (to reduce calculation errors)
Assume a long trade and that the pair uses a pip size of 0.0001. If entry is 1.2000 and exit is 1.2010:
- Price change = 1.2010 − 1.2000 = 0.0010
- Pips = 0.0010 ÷ 0.0001 = 10 pips gained
- Monetary gain/loss = 10 × (pip value for your position size)
For checks:
- Direction check: If you flip a long to a short with the same prices, the pips should flip sign.
- Sanity check: If the exit equals the entry, pips and monetary gain/loss should be zero.
- Pair-specific check: Confirm the pip size for the specific pair you used; using the wrong pip size is a frequent source of mismatch.
Relevant limitations and uncertainty
- Pip size varies by pair: some pairs and quote formats do not follow a single “0.0001 always” rule.
- Monetary conversion can vary: converting pip value into your account currency may require additional exchange-rate assumptions.
- Costs may be excluded or included: the “gain or loss” you compute can differ from platform figures if you include or ignore spread, commissions, or financing. If you are comparing numbers, use a consistent definition.
- Past-only for averages: average win and average loss are calculated from completed trades and do not determine future outcomes.
- No guarantee of results: calculations quantify what happened given entry/exit data; they do not ensure future profitability.