based on regular large egg. and all approximates.
1 cup = 5 whole eggs
1/2 cup = 3 whole eggs
1/4 cup = 1 whole egg
I use the measuring cup and crack as many as needed.
This is all based on the eggs size, I use my hen eggs (large to extra large) so one day i cracked one and found it to be about 1/4 cup. so I use that for how many quail eggs to use.
If you want to be exact weight it rather then measure it.