Definition: what “pip” means
A pip (percentage in point) is a unit used to describe price movement in foreign exchange markets. In many common forex quoting conventions, a pip is tied to the fourth decimal place of a currency pair’s price (for example, from 1.1234 to 1.1235 is often described as a 1-pip move). On some instruments, a different decimal convention is used, so the exact pip size depends on the quoted format of the specific symbol.
A pip definition therefore means: for a particular instrument and quote format, what price change corresponds to 1 pip? Once that mapping is fixed, you can count how many pips a move represents.
Worked example with explicit assumptions
Below is a worked example that stays purely numerical. It assumes a standard “fourth decimal” pip convention.
Assumptions (state every one)
- We are working with a forex pair quoted like 1.12345 (five decimal places shown).
- For this example, 1 pip = 0.0001 in price.
- The entry price is 1.12345 and the exit price is 1.12510.
- We measure the move as exit − entry.
- We ignore costs (spread, commission, slippage) because pip definition is about price distance, not trading results.
Step 1: Compute the raw price move
Price move = 1.12510 − 1.12345 = 0.00165.
Step 2: Convert price move into pip count
Pip size = 0.0001 (by assumption).
Pips = 0.00165 ÷ 0.0001 = 16.5 pips.
Step 3: Interpret what “16.5 pips” means
A “half pip” occurs because the price moved by a value that is not an exact multiple of 0.0001. Your chart or platform may round or display pip increments differently, but the underlying definition mapping here implies 16.5.
Evidence via an alternative consistency check
You can verify the same result by working at the decimal-place level.
- Entry: 1.12345
- Exit: 1.12510
Compare the digits in the fourth and fifth decimals:
- The fourth-decimal increment from 1.1234 to 1.1251 is +0.0017 if you treat the fifth decimal as fractional toward the pip.
- Our exact arithmetic already captured that fraction, producing 0.00165, which is consistent with a move of 16 full pips plus 0.5 pip.
This check reinforces the core idea: pip definition is a conversion rule, so verification should always reproduce the same pip count from the chosen rule.
Limitations and failure modes
- Instrument-specific pip size: The “fourth decimal” rule is common, but not universal. If an instrument’s quote format uses a different pip size, your pip count will be wrong even if your math is perfect.
- Rounding and display differences: Platforms may display pip movements rounded to whole pips or to a pipettes-like fractional unit. Your calculated fractional result (like 16.5) may not match the display if rounding happens.
- Costs vs. price movement: Pip definition describes price distance, not profit or loss. Spread, commission, and execution quality can change outcomes even when the pip move is correctly measured.
- Historical vs. future assumptions: A pip rule is a convention about a quote format. If the provider changes quoting decimals or the instrument changes, prior calculations may no longer apply.
How to verify pip definition independently
- Identify the quoted price format for the exact instrument (how many decimals are shown).
- Confirm the pip size rule used for that instrument (e.g., 1 pip equals which decimal step).
- Redo the calculation: compute exit − entry, then divide by the pip size you verified.
- Check rounding behavior: note whether the platform reports whole pips, fractional pips, or rounded values.
If you want, share the exact example pair and the number of decimals shown in its quote format, and you can apply the same conversion steps using your instrument’s pip-size convention.