Going from Urdu to Persian (Farsi) (فارسی) has a composite linguistic distance of 55% (curated lexical data). Below is the dimension-by-dimension breakdown.
Shared vocabulary, cognates, and loanwords.
Morphology, syntax, word order, cases.
Shared sounds and phoneme inventory.
Arabic → Arabic
Indo-European ↔ Indo-European
Word pairs that share a common etymological root — instantly recognisable across both languages:
The 5 languages with the lowest linguistic distance from Urdu:
A quick 3-question check between Urdu and Persian (Farsi). No signup.