Almost every costly beginner mistake traces back to one of three numbers being wrong: what a pip is worth, how big the position should be, and what the trade actually made or lost. None of them require more than multiplication — but each has one detail that catches people out, and gold catches out almost everybody. This guide gives you the formula and a worked example for each.
What a pip actually is
A pip is the smallest standard price increment of an instrument. For most currency pairs that is the fourth decimal place — if EURUSD moves from 1.0850 to 1.0851, that is one pip. For pairs quoted against the Japanese yen it is the second decimal place, because the yen trades in much larger numbers: USDJPY moving 150.20 to 150.21 is also one pip.
You will also see a fifth decimal on your platform (1.08505). That is a "pipette" or fractional pip — a tenth of a pip. It exists so brokers can quote tighter spreads, and it is not what any calculator means by "pip".
| Instrument | Pip location | One pip | Standard lot |
|---|---|---|---|
| EURUSD, GBPUSD, AUDUSD | 4th decimal | 0.0001 | 100,000 units |
| USDJPY, EURJPY | 2nd decimal | 0.01 | 100,000 units |
| XAUUSD (gold) | see below | varies by broker | 100 ounces |
Lot sizes are the industry standard; always confirm the contract size in your platform's instrument specification before sizing a trade.
Pip value: what one pip is worth to you
Pip value depends on the position size and on which currency the pair is quoted in. When the quote currency is the US dollar — as in EURUSD, GBPUSD, AUDUSD — the calculation is as simple as it gets, because the result is already in dollars.
Pip value = pip size × contract size × lots
Use this directly when the pair ends in USD and your account is in USD.
0.0001 × 100,000 × 1.00 = 10
That single figure is worth memorising, because everything scales from it: a standard lot of any USD-quoted pair is $10 a pip, a mini lot (0.10) is $1, and a micro lot (0.01) is $0.10. If you are starting out and trading 0.01 lots, a 50-pip loss costs you five dollars.
When the pair does not end in USD
For a pair like USDJPY, the pip value comes out in yen and has to be converted back to your account currency at the current rate.
0.01 × 100,000 × 1.00 = ¥1,000 per pip
¥1,000 ÷ 150.00 = 6.67
Note what this means in practice: the pip value of a yen pair drifts as the exchange rate moves. It is not a fixed number the way a USD-quoted pair is, which is one reason position-size calculators exist rather than traders relying on mental arithmetic.
Gold (XAUUSD): why the pip confuses everyone
There is no single agreed gold pip
Some brokers define one XAUUSD pip as 0.01, others as 0.10, and plenty of traders use "pip" to mean a whole $1.00 move. The same stop loss can therefore be described as 350 pips, 35 pips, or 3.5 dollars. This is the single most common reason a gold position ends up ten times bigger than intended.
The reliable way to handle gold is to skip the word "pip" entirely and work in dollars of price movement, because the contract size is what actually determines your risk. A standard XAUUSD lot is 100 ounces, so a $1.00 move in the gold price is $100 to a one-lot position.
Gold P/L = price move in dollars × 100 × lots
A standard lot is 100 ounces. A 0.01 lot is one ounce, so a $1.00 move is $1.
12.00 × 100 × 0.10 = 120
With gold trading around $4,350 in August 2026, a routine day can cover $40–$60 of range. On a single standard lot that is $4,000–$6,000 of swing — which is why gold rewards small position sizes and punishes anyone who sizes it like a currency pair.
Position size: the only calculation that protects you
Most traders do this backwards. They decide the lot size first, then place a stop wherever it looks reasonable. Professionals invert it: the stop goes where the chart says the idea is wrong, the risk is a fixed percentage of the account, and the lot size is whatever those two facts imply. Size is an output, not a decision.
Lots = (account × risk %) ÷ (stop in pips × pip value per lot)
25 × 10 = 250 (loss per full lot)
100 ÷ 250 = 0.4
Widen the stop to 50 pips and the position must halve to 0.20 lots. The dollar risk never changes — only the size flexes to accommodate the stop. That is the whole mechanism, and it is what lets you survive a losing streak without a special effort of will.
3.50 × 100 = 350 (loss per full lot)
100 ÷ 350 = 0.2857
Round down, never up
The gold example gives 0.2857 lots. Trading 0.28 risks $98; rounding up to 0.29 risks $101.50 and quietly breaks the rule you just set. When a calculation lands between two sizes, always take the smaller one.
Profit and loss on a closed trade
Once you know the pip value, profit is just the move multiplied by it. There are two equivalent routes to the same figure, and it is worth being able to run both as a sanity check.
P/L = (exit − entry) × contract size × lots
For a sell, reverse the subtraction: (entry − exit).
Via price: (1.0910 − 1.0850) × 100,000 × 0.40 = 0.0060 × 40,000 = 240
Via pips: 60 pips × $10 × 0.40 = 240
Both routes agree, which is the point. If your platform shows a materially different number, the difference is almost always spread, commission, or an overnight swap charge — not an error in the arithmetic.
Margin: what the position ties up
Margin is not a cost and it is not risk — it is the deposit held while the position is open. It matters because running out of free margin is what triggers a margin call, even on trades that would eventually have worked.
Margin = (lots × contract size × price) ÷ leverage
| Position | Price | Leverage | Margin required |
|---|---|---|---|
| 0.40 lots EURUSD | 1.0850 | 1:100 | $434 |
| 0.40 lots EURUSD | 1.0850 | 1:500 | $87 |
| 0.28 lots XAUUSD | $4,350 | 1:100 | $1,218 |
| 0.28 lots XAUUSD | $4,350 | 1:500 | $244 |
Same risk in both gold rows — $100 — but very different margin. Leverage changes what you can hold, never what you stand to lose.
Leverage is not the same as risk
Traders routinely say "1:500 is dangerous". Leverage on its own loses nothing — it only sets the margin. What loses money is position size against a stop loss. A 0.28-lot gold trade risks $100 whether the account runs at 1:100 or 1:500; higher leverage simply frees margin, which becomes dangerous only if you then use it to size up.
A pre-trade checklist
- 1Confirm the contract size for the instrument in your platform — do not assume 100,000.
- 2Decide where the stop goes based on the chart, before thinking about size.
- 3Fix your risk as a percentage of the account: 1% while learning, 2% at most.
- 4Calculate the lot size from that risk and that stop distance. Round down.
- 5Check the margin required leaves plenty of free margin for open positions.
- 6Set the stop loss and take profit on the order itself, not in your head.
Run through this on the Propeno forex calculator rather than by hand — it holds the contract sizes and current rates for you, and it takes seconds. The arithmetic above is here so you understand what the tool is doing and can spot when a number looks wrong.
Open the forex calculatorKey takeaways
- A standard lot of any USD-quoted pair is $10 per pip; scale everything from there.
- For gold, ignore "pips" and work in dollars of movement — a standard lot is 100 ounces, so $1.00 of price is $100.
- Position size is an output of your stop and your risk percentage, never a decision you make first.
- When a size calculation falls between two lots, always round down.
- Leverage sets margin, not risk. Stop distance and position size set risk.
Frequently asked questions
What is one pip worth in forex?+
For a standard lot (100,000 units) of any pair quoted against the US dollar, one pip is worth $10. A mini lot (0.10) is $1 per pip and a micro lot (0.01) is $0.10 per pip. For pairs not quoted in USD, such as USDJPY, the value must be converted at the current exchange rate — one standard lot of USDJPY is ¥1,000 per pip, which is about $6.67 when USDJPY trades at 150.00.
How many pips is a dollar move in gold?+
It depends on your broker, which is why gold is best calculated in dollars of price movement rather than pips. Definitions of a gold pip range from 0.01 to 0.10, so a $1.00 move could be quoted as 100 pips or 10 pips. What does not vary is the contract size: a standard XAUUSD lot is 100 ounces, so a $1.00 move is always $100 per standard lot and $1 per 0.01 lot.
How do I calculate lot size from my risk?+
Divide the dollar amount you are willing to lose by the loss a full lot would produce at your stop distance. On a $10,000 account risking 1% ($100) with a 25-pip stop on EURUSD, a full lot would lose 25 × $10 = $250, so the position is $100 ÷ $250 = 0.40 lots. Always round down to the next tradeable size.
Does higher leverage mean I lose more?+
No. Leverage only determines the margin held while a position is open. Your loss is set by position size and stop distance. The same 0.40-lot EURUSD trade with a 25-pip stop loses $100 at 1:100 and $100 at 1:500 — the difference is that 1:500 ties up $87 of margin instead of $434. Leverage becomes dangerous only when the freed margin tempts you into a larger position.
Why does my platform show a different profit than my calculation?+
Almost always the spread, a commission, or an overnight swap charge. A calculator works from the mid price; you buy at the ask and sell at the bid, so the round trip costs the spread. On positions held overnight, a financing charge or credit is applied as well. The arithmetic itself does not change.