Since 1 British Pound is equal to 258.1894707241628 Guyanaese Dollars, we could say that n British Pounds are equal to 258.1894707241628 times n Guyanaese Dollars. In other words, we could use the following formula:
Guyanaese Dollars = British Pounds x 258.1894707241628
For example, let's say that we want to convert 2.0 British Pounds to Guyanaese Dollars. Then, we just replace British Pounds in the abovementioned formula with 2.0:
Guyanaese Dollars = 2.0 x 258.1894707241628
That is, 2.0 British Pounds are equal to 516.3789414483256 Guyanaese Dollars.