madaochenggong

Dreary , you got the wrong rate in there man.

Only LIBOR can be divided by 2 , 4 etc. Spot rates are compund rates , never simple return rates.

You are dividing 057492/2.

i.e. Spot Rates / 2 . Thats a no-no. Instead it can be ( 1+ LIBOR/2)

You want to compound the spot rates that's fine . But don't divide by 2 . Take Sqrt if you have to .

The answer is so close to 6.25 % that it is impossible to say its rounding error. It looks very close to exact.