Zakat ul Fitr is obligatory charity which is at Eid-ul-Fitr at the end of the month of Ramadan. This is so that poor Muslims will be able to enjoy Eid.
As per the Hanafi school, it must be paid by every Muslim if the total value of his/her Zakatable assets (cash, gold, silver, merchandise) plus non-essential items (i.e. assets above their basic needs) minus liabilities (debts) equals or exceeds Nisab (the minimum amount that a Muslim must have before being obliged to give zakat). A person must also pay Zakat ul Fitr on behalf of all children under their care.
The quantity is described by the Prophet (SAW) as one saa’ of food – equal to four scoops when one puts their hands together. The equivalent amount of money is currently recommended at £7.