If your pancake pan is smaller than the one I used (29cm diameter), you will probably obtain 4 or even 5 pancakes and may not even need to cut them across before filling and rolling.
Metric kitchen scales are an inexpensive yet invaluable gadget to enable accurate measurement of ingredients. Store them upright in a cupboard or over your worktop and they'll only take up a tiny bit of space. Click
HERE for the ones I use.