Since 1 US Dollar is equal to 1.588205 New Zealand Dollars, we could say that n United States Dollars are equal to 1.588205 times n New Zealand Dollars. In other words, we could use the following formula:
New Zealand Dollars = United States Dollars x 1.588205
For example, let's say that we want to convert 2 United States Dollars to New Zealand Dollars. Then, we just replace United States Dollars in the abovementioned formula with 2:
New Zealand Dollars = 2 x 1.588205
That is, 2 United States Dollars are equal to 3.17641 New Zealand Dollars.