cost of a cracked macbook 13 screen

Only an Apple technician can provide you with an exact cost as the damage may be more than just the display screen. The cost will also depend on, whether or not, you purchased an AppleCare+ plan and that plan still being active.

Ref: AppleCare+ for Mac - Apple Support

Also should your product no longer be considered supported by Apple service, third party authorized

repairers may be able to replace defective parts and restore the display functions. Several parts may be

at fault when the symptom is only described as 'cracked screen' or 'display won't work'.

If the display is damaged, further investigation would be taken to see to what depth damages exist.

An external display w/ correct adapter/cable can also be helpful to learn if other connections are bad.

And if this unit is older with no replacement (new) parts available, there are some businesses whose

inventory may include tested-OK used parts with limited guaranty; cited prices may not include labor.

To identify the build model year and hardware specification is essential to determining detailed facts.