The palm of your hand, without the fingers, and the full thickness, is approximately 3 ounces.
This could be used for chicken breasts, steaks or chops, and fish steaks and fillets.
Your closed fist is approximately 1 cup.
This can be used for things such as pasta, popcorn, cereals, and ice cream.
Your index finger, from first joint to tip, is approximately 1 tsp.
This is a good measure for sugar, butter, or peanut butter.
Your thumb, from first joint to tip, is approximately the same volume as 1 tablespoon.
The full thumb, from base to tip, is approximately 1 ounce.
This is a good visual measure for cheeses, meats and chocolate.