Going from Tibetan to Tagalog (Filipino) has a composite linguistic distance of 81% (heuristic estimate). Below is the dimension-by-dimension breakdown.
Shared vocabulary, cognates, and loanwords.
Morphology, syntax, word order, cases.
Shared sounds and phoneme inventory.
Tibetan → Latin
Sino-Tibetan ↔ Austronesian
The 5 languages with the lowest linguistic distance from Tibetan:
A quick 3-question check between Tibetan and Tagalog. No signup.