Dua for opening fast in Ramadan
وَبِصَوْمِ غَدٍ نَّوَيْتَ مِنْ شَهْرِ رَمَضَا
Wa bisawmi ghadinn nawaiytu min shahri ramadan.
I intend to keep the fast for tomorrow in the month of Ramadan.
Here is another dua for opening your fast in Ramadhan
نـَوَيْتُ صَوْمَ غـَدٍ عَـنْ ا َدَاءِ فـَرْضِ شـَهْرِ رَمـَضَانَ هـَذِهِ السَّـنـَةِ لِلـّهِ تـَعَالىَ
Nawaitu sauma ghadin anadai fardu syahri ramadhana hadzihissanati lillahitaala.
I intend to do an obligatory fast tomorrow in the month of Ramadan this year because of Allah (SWT).
Dua for breaking fast in Ramadan
اللَّهُمَّ لَكَ صُمْتُ وَعَلَى رِزْقِكَ أَفْطَرْتُ
Allah umma laka sumtu wa ‘ala rizqika aftartu
O Allah, for You I have fasted, and by Your provision, I have broken the fast
Dua For Breaking Fast With A Group Of People
أفطر عندكم الصائمون ، وأكل طعامكم الأبرار ، وصلت عليكم الملائكة
aftara indakum as-saa’imoon, wa akala ta’aamakum al-abraar, wa sallat alaikum al-malaa’ikah
May the fasting people break fast at your place, and may the pious eat from your food, and may the angels pray for you.