Class 10 Micro TF Card 256GB 128GB 64GB 32GB Memory Card 16GB 8GB High Speed Flash Card A1 Mini TF SD Card for Smartphone Camera

About capacity:

4GB=approximately 3.6GB-3.8GB

8GB=approximately 7.2GB-7.6GB

16GB=approximately 14.4GB-14.8GB
32GB=approximately 28.5GB-30GB
64GB=approximately 58GB-60GB
128GB=approximately 110GB-120GB

256GB=approximately 230GB-238GB

This is calculation difference between manufacturer and our PC,just for you reference.

Package :

1 X Micro TF Card
1 X retail package