Since 1 US Dollar is equal to 1.613163 New Zealand Dollars, we could say that n United States Dollars are equal to 1.613163 times n New Zealand Dollars. In other words, we could use the following formula:
New Zealand Dollars = United States Dollars x 1.613163
For example, let's say that we want to convert 2.0 United States Dollars to New Zealand Dollars. Then, we just replace United States Dollars in the abovementioned formula with 2.0:
New Zealand Dollars = 2.0 x 1.613163
That is, 2.0 United States Dollars are equal to 3.226326 New Zealand Dollars.