What is the key length of AES-128 in bytes?

Question

Accepted Answer

AES-128 uses a 128-bit key, which is 16 bytes.
Quick conversion: 128 bits ÷ 8 bits/byte = 16 bytes.
All AES variants:

Variant
Key bits
Key bytes
Block bits
Block bytes

AES-128
128
16
128
16

AES-192
192
24
128
16

AES-256
256
32
128
16

Note: The block size is always 128 bits (16 bytes) regardless of the key length. Only the number of rounds changes (10, 12, or 14).