The NZD / SGD usually trades at 1:1 and isn't the currency you would trade if you wanted to make money.
I trade FX (without the intention of actively trading of course) :slfg: regularly but I wouldn't recommend you mess around with it if you only kind of know what you are doing.
Money makers are usually NZD/USD, CHF/USD, and more recently NZD/EUR.
Also remember that if you look up FX rates you'll probably be looking at the reuters info which is wholesale rates, and you'll have 100% shading so take a couple cents or more depending on currency per dollar against your favour.
Either which way the NZD is pretty darn strong at the moment but watch it tumble as bank wholesale costs increase because of the US economy picking up.