We can give you a basic idea about measurement without a measuring cup at home.
1/8 teaspoon is about to one good pinch between your three finger, thumb and forefinger and middle finger.
A teaspoon is about the size of the tip of your five fingers together or a coffee spoon.
You can measure a tablespoon which is about to half of a ping-pong ball or the size of an ice cube. You can measure it with a dinner spoon
1/4 cup is about the size of a large egg.
1/2 cup is about the size of a tennis ball.
1 cup is about the size of a standard coffee mug