The best bet is that the clutch will weight about 1/3 of the female's prelay weight (that's 1/2 of what she weighs after laying, incredible!). Really big and fat females might be a bit light on the clutch proportion but the ratio of the total clutch weight to female weight is a fairly reliable rule.

Unfortunately there is a tendency for big girls to lay really big eggs. So while of course the highest number of eggs will come from the biggest girls it's not a linear equation. My scale broke years ago but I had a moderate sized first clutch girl lay 9 eggs this year that where probably around 80 - 90 grams each. A much larger girl of mine laid only 1 more out on a breeding loan but those 10 eggs where about 120 grams each. If she could have just laid the same small eggs she might have been up around the 14 mark she hit a couple years ago.

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