How large is the urethral tube?

The urethra varies in size between males and females. In males, it is typically about 18 to 20 centimeters (7 to 8 inches) long and approximately 6 to 8 millimeters in diameter. In females, the urethra is shorter, averaging about 4 to 5 centimeters (1.5 to 2 inches) long and about 6 millimeters in diameter. Overall, the urethral tube is relatively narrow and serves as the conduit for urine excretion.