Unit of measurement to express the change in value between two currencies is called a “Pip“. If EUR/USD moves from 1.4100 to 1.4101, that is ONE PIP. A pip is the last decimal place of a quotation, given that four decimal places are used for pairs without the Japanese yen. If a pair does include the Japanese yen, then the currency quote goes out two decimal places.
Each currency has its own value(see also what is a lot), it is necessary to calculate the value of a pip for that particular currency. For example:
EUR/USD is quoted at 1.41
0.001 is dived by exchange rate = pip value
0.0001 / 1.4100 = 0.0000709
USD/CHF at 1.5250
.0001 divided by exchange rate = pip value
.0001 / 1.5250 = 0.0000655