The general rule is: for a larger pan, reduce baking time and increase temperature slightly. For a smaller pan, increase baking time and reduce temperature.
For most baked goods: 1/4 cup applesauce, 1 mashed banana, or 1 tbsp flaxseed + 3 tbsp water per egg. Each gives slightly different results.
It depends on the ingredient. 1 cup of flour = 120g, 1 cup of sugar = 200g, 1 cup of butter = 227g. Use our volume-to-weight converter for accuracy.