How many meters is it around Neston cricket field?

I am training for an athletics competion and i am practicing around the back cricket field at Neston cricket club (the field the 2nd team play on). However i do not know how many metres it is once round. I am practicing for the 800 metres so if anyone has any idea about how many times round that is please can you help me! ps i have been going round twice around the boundary? is that correct? xxxxxxx :-) please reply guys xxxxx