The most expensive assumption in forex is that a pip is a pip. It isn’t. The same one-pip move is worth a clean round number on one pair, an odd fraction on another, and something entirely different on gold — and every position-sizing formula you use ends in that number.
What a pip actually is (and where the decimal lives)
A pip is the standard smallest increment a pair is conventionally quoted in. For most pairs that’s the fourth decimal — EURUSD moving 1.1050 to 1.1051 is one pip. For yen pairs it’s the second decimal — USDJPY moving 150.20 to 150.21 is one pip. Many brokers also quote a fifth (or third) decimal, the pipette, which is a tenth of a pip; don’t confuse the two or your stop distance is off by 10x.
The decimal placement is the first thing to get right because everything downstream inherits it:
- Most majors and crosses — pip = 0.0001.
- JPY pairs — pip = 0.01.
- Pipette — one more decimal than the pip; a tenth of a pip.
Anchor these before you touch a position-sizing formula. A stop measured in pipettes when you meant pips, or a yen pip counted in the wrong column, produces a position that’s an order of magnitude off — and on a prop account that’s a same-day breach, not a rounding error.
Pip value for USD-quoted pairs vs JPY pairs
Pip value is what one pip is worth per lot, and it’s naturally expressed in the pair’s quote currency — the one on the right. This is the distinction that trips people up.
- USD-quoted pairs (EURUSD, GBPUSD, AUDUSD) — the quote currency is USD, so for a USD account the pip value per standard lot lands on a familiar round number, and per-lot risk is easy to reason about.
- JPY pairs (USDJPY, EURJPY) — the pip value is a fixed amount in yen, which then has to be converted to your account currency at the current rate. Even on a USD account, USDJPY’s pip value isn’t the same clean number as EURUSD’s, because it comes through the yen.
- Pairs where neither side is USD (a cross like EURGBP) — the pip value is in the quote currency (GBP here) and needs converting through that currency’s rate.
The failure mode is assuming the round-number pip value you memorized on EURUSD carries to every pair. It doesn’t. Any pair whose quote currency isn’t your account currency needs a conversion, and skipping it leaves your real risk off by whatever that exchange rate happens to be.
How account currency changes your pip value
Your account currency is the second lever, and it’s easy to forget because it’s invisible on the chart. Pip value is computed in the quote currency, then converted into whatever your account is denominated in.
- If your account is USD and you trade a USD-quoted pair, no conversion — the clean number holds.
- If your account is EUR, GBP or anything else, even EURUSD’s pip value gets converted into your currency at the live rate.
- That conversion floats, so your exact per-pip risk drifts slightly as the rate moves. For sizing purposes it’s stable enough to compute at entry, but it’s why two traders on the “same” pair with different account currencies risk slightly different amounts per pip.
None of this is hard — it’s one multiplication — but it’s one that has to happen per pair, per account. A lot size calculator does the quote-currency-to-account-currency conversion automatically, so you’re never eyeballing an exchange rate mid-setup.
Pip value for gold and index CFDs
Metals and indices break the forex “pip” vocabulary entirely, and the safest habit is to stop saying “pip” and say value per point instead.
- Gold (XAUUSD) quotes in dollars per ounce. Depending on how your broker defines the pip on gold, one dollar of movement can be worth many times a forex pip per lot. The value per point is large, which is why gold sizing so often goes wrong when traders reuse forex lot sizes.
- Index CFDs (US30, NAS100, GER40) move in points, and each index has its own published point value per contract. They don’t share a multiplier, and they’re far larger than a forex pip.
Here’s the practical translation table — treat the character, not exact figures, and always confirm the real spec on your platform since brokers differ and micro versions exist:
| Instrument | Smallest unit | Value character |
|---|---|---|
| Majors (EURUSD, GBPUSD) | Pip = 0.0001 | Clean round per-lot value on a matching-currency account |
| JPY pairs (USDJPY) | Pip = 0.01 | Fixed in yen, converted to account currency |
| Gold (XAUUSD) | Point (per $ move) | Large per-lot value — sizes down hard |
| Indices (US30, NAS100) | Point | Large, and different per index |
The lesson the table makes visible: the word “pip” quietly stops applying, so anchor to value-per-point and look it up per instrument rather than reusing a forex number.
Turning pip value into a position size
Every one of these strands feeds a single formula — the whole reason pip value matters:
Position size = Risk amount ÷ (Stop distance × Value per point)
- Your risk amount is fixed — a set fraction of equity, identical on every trade, which is what makes your 1R a constant you can compare across pairs.
- Your stop distance is measured in the instrument’s own unit (pips, or points for gold/indices).
- Your value per point is the number this whole guide is about — correct for the pair and your account currency.
Get the value-per-point right and one division gives you honest lots. Get it wrong — a missed yen conversion, a cross skipped, a gold point mistaken for a forex pip — and the trade looks perfectly sized on the ticket while your real dollar risk is double or half what you planned. That’s the insidious part: nothing warns you, and you only find out on the loss. A position size calculator lets you flip between asset classes without re-deriving value-per-point each time, which is exactly where manual sizing slips.
Across one pair this is easy to hold in your head. Across a full book and several prop accounts, it’s where fatigue produces the expensive error. Connecting your platform — MetaTrader 5 or another supported broker — lets Shibiki read the real contract spec and pip value per instrument, enforce your intended risk as a hard limit at the broker so a mis-sized ticket is refused before it fills, and auto-journal each fill’s realized R so you can see, trade by trade, whether your intended risk and actual risk actually lined up. If you run the same strategy across multiple funded accounts, copying keeps that sizing consistent everywhere at once instead of re-deriving pip value per account.
Learn where the decimal lives, convert for your account currency, and value-per-point stops being the term where your risk plan silently breaks.
Related: Lot Size Calculator · Position Size Calculator · R-Multiple