1. If it's a birthday cake (sponge cake), it's about 1.75g, which is 3.2 halves, enough for 2-3 people.

2. If it is a 6-inch Mu Si cake, the weight of the cheesecake (frozen cheesecake) will be about 511 grams, that is, 1 kg. This is enough for 6-8 people.

Extended information:

1. Birthday cake is a delicacy and a necessity for birthdays. It first originated in the West, and then it was slowly introduced to China. The earliest cakes were made of several simple materials. These cakes are symbols of ancient religious myths and miraculous superstitions.

2. There are many kinds of cakes, such as Mu Si cake, cheese cake, art cake, sugar-free cake, French cake, European cake, wedding cake, birthday cake, chocolate cake, children's cake, baked cheese cake, ice cream cake, cream fruit, classic cake, fresh milk cake, large cake, frozen cheese cake, digital cake and so on.

3. Origin of birthday cake: Europeans in the Middle Ages believed that birthdays were the day when the soul was most vulnerable to the invasion of demons, so on the birthday, relatives and friends would gather around to give their blessings and send cakes to bring good luck and drive away demons. At first, only the king was entitled to have a birthday cake. No matter adults or children, they can buy a beautiful cake on their birthdays and enjoy the blessings given by everyone.

Reference: Baidu Encyclopedia: Birthday Cake.