The term "Purnahuti" means, "Complete offering away of oneself". It includes the offering of nine types of grains, ghee etc into the fire while chanting specified mantras. As per the Vedas, these mantras have the power of creating special vibrations, which creates a divine atmosphere around to fulfill one`s wish.

The `ahuti` to be used in "Purnahuti" is brought by the neighbors and friends. Then it is mixed and offered to the fire by everyone present. The priest of the ceremony now recites the particular mantra and says "Swaaha", which means, "we offer". Everybody present there chants "Swaaha" in unison and offers the oblation. The giving of `ahuti` in the `Agni Kunda` symbolises the putting of our abilities into a field of activity in a spirit of dedication. Then the result is left to the higher power. If the `ahuti` is given in the right spirit, then the higher power will definitely bless by providing success in the attempted work. The "Purnahuti" is symbolised by the final `ahuti`, which comprises dry coconut, nine grains, five metals such as Silver, Gold, Copper, Zinc and Brass, betel leaves, betel nuts, dry fruits, medicinal herbs, sandal wood sticks, saffron and other offerings up in a silk cloth. The colour of the cloth depends on the type of `Havan`. For example, in `Gayatri`, `Sudarshana` and `Durga Havans` red colour is used and for `Vidya Havan`, white colour, whereas in `Kubera homa`, the white colour is used. All the above-mentioned offerings are drenched in ghee while Vedic mantras are chanted and then offered to the `Havan Kunda`. This marks the end of the "Purnahuti" ceremony.

It is said that, even attending a "Purnahuti" ceremony gives the worth of entire celebration. The people present in the ceremony should surrender themselves to the divine will. The "Purnahuti shlok" is sung at the end of any satsang sabha, ghar sabha and satsang meeting. The "Purnahuti shlok" is,
"Shriharim sãksharam sarvadeveshvaram,
Bhaktidharmãtmajam divyarupam param;
Shãntidam Muktidam kãmadam kãranam,
Swãminãrãyanam Nilkantham bhaje."

The meaning of this "Purnahuti shlok" is, "I offer worship to Bhagwan Swaminarayan, also known as Nilkanth Varni. As Shrihari, together with Aksharbrahma, He is resplendent. He is the God of all gods, the son of Bhakti and Dharma and has the supreme divine form. He is the bestower of peace, mukti (liberation), fulfiller of all desires and the cause of all causes."