Sanskrit Transliteration Guide (Source: Wikipedia)

Vowels Devanāgarī IAST ITRANS अ a a आ ā A / aa इ i i ई ī I / ii उ u u ऊ ū U / uu Diphthongs ए e e ऐ ai ai ओ o o औ au au Alveolar approximant ऋ ṛ RRi / R^i ॠ ṝ RRI / R^I ऌ ḷ LLi / L^i ॡ ḹ LLI / L^I Anusvara अं ṃ M / .n / .m Visarga अः ḥ H	Consonants The Devanāgarī consonant letters include an implicit 'a' sound. In all of the transliteration systems, that 'a' sound should be represented explicitly.
	velars palatals retroflexes dentals labials Dev. IAST क k K च c C ट ṭ Ṭ त t T प p P unvoiced stops ITRANS k ch T t p Dev. IAST ख kh Kh छ ch Ch ठ ṭh Ṭh थ th Th फ ph Ph aspirated unvoiced stops ITRANS kh Ch Th th ph Dev. IAST ग g G ज j J ड ḍ Ḍ द d D ब b B voiced stops ITRANS g j D d b Dev. IAST घ gh Gh झ jh Jh ढ ḍh Ḍh ध dh Dh भ bh Bh aspirated voiced stops ITRANS gh jh Dh dh bh Dev. IAST ङ ṅ Ṅ ञ ñ Ñ ण ṇ Ṇ न n N म m M nasal ITRANS ~N ~n N n m Dev. IAST य y Y र r R ल l L व v V semi-vowels ITRANS y r l v or w Dev. IAST श ś Ś ष ṣ Ṣ स s S sibilants ITRANS sh Sh s Dev. IAST ह h H voiced fricative ITRANS h Note: Unlike ASCII-only romanizations such as ITRANS or Harvard-Kyoto, the diacritics used for IAST allow capitalization of proper names. The capital variants of letters never occurring word-initially (Ṇ Ṅ Ñ Ṝ) are only useful in Pāṇini contexts, where the convention is to typeset the IT sounds as capital letters (see Aṣṭādhyāyī).	Irregular Consonant Clusters Devanāgarī IAST ITRANS क्ष kṣ kS / kSh / x त्र tr tr ज्ञ jñ GY / j~n श्र śr shr Other Consonants Devanāgarī IAST ITRANS क़ q q ख़ k͟h Kh ग़ ġ G ज़ z z फ़ f f ड़ ṛ .D / R ढ़ ṛh .Dh / Rh