Since 1 New Zealand Dollar is equal to 0.620807223216 United States Dollars, we could say that n New Zealand Dollars are equal to 0.620807223216 times n United States Dollars. In other words, we could use the following formula:
United States Dollars = New Zealand Dollars x 0.620807223216
For example, let's say that we want to convert 2 New Zealand Dollars to United States Dollars. Then, we just replace New Zealand Dollars in the abovementioned formula with 2:
United States Dollars = 2 x 0.620807223216
That is, 2 New Zealand Dollars are equal to 1.24161444643 United States Dollars.