How Many GB of Data Do I Need Per Day Abroad? A Calculator and What Travelers Report By Chester Takau · November 2026 Most travelers need well under 1 GB a day. Vendor guides say 1 GB a day is the sweet spot, but the median travel eSIM bought in Cellesim's 2026 dataset was 5 GB, usually valid for 30 days. Maps and messaging barely register. Video is what changes the answer: an hour of standard-definition YouTube uses about 500 MB. Use the calculator below to size a plan for your own trip. Chester Takau Chester Takau is an independent reviewer of dual-SIM and eSIM technology, testing setups from the Pacific where connectivity choices really matter. Data calculator: how many GB do I need for my trip? Trip length (days) Maps navigation (hours/day) About 5 MB/hour, from one forum traveler's 200 hours = 1 GB Standard-definition YouTube (hours/day) About 500 MB/hour (Airalo/Breeze) Short-form social video (hours/day) 100-300 MB/hour, calculated at 20...