Going from Japanese to English (English) has a composite linguistic distance of 87% (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.
Japanese โ Latin
Japonic โ Indo-European
How everyday sentences look in both languages:
The 5 languages with the lowest linguistic distance from Japanese:
A quick 3-question check between Japanese and English. No signup.