eSIM Data Calculator: How Many GB Do I Need

How to use this calculator

Enter how many days you will be abroad.
Estimate how many hours a day you use maps, browsing, social media, music, video and calls on mobile data.
Leave activities you will do only on Wi-Fi at 0.
Read the estimated total and the suggested plan size with the safety buffer.
Compare eSIM plans of that size and pick the best value for your trip.

How to choose the right eSIM data plan

Buying too little data means paying for a top-up at a worse rate, while buying too much wastes money. The best plan matches how you actually use your phone abroad. Maps and messaging use very little data, while video streaming and calls use a lot.

This planner estimates your total data from your daily habits and the length of your trip, adds a buffer and suggests a plan size. Change the hours to see how much you can save by moving video to hotel Wi-Fi or downloading maps ahead of time.

Compare options on the Airalo page and read our eSIM comparison before you buy.

How the data estimate is calculated

Each activity uses a typical amount of data per hour, such as about 10 MB for maps, 60 MB for browsing, 150 MB for social media, 70 MB for music, 500 MB for standard video, 1.5 GB for HD video and 600 MB for video calls.
Total data equals the sum of your daily use times the number of days.
We add a 20% buffer for background updates and surprises, then suggest the next common plan size.
Real use varies by app and settings. Turn on Wi-Fi at your hotel and download maps and shows in advance to use less.

Tips to save more

Download offline maps and playlists before you fly.
Use hotel and cafe Wi-Fi for video and big downloads.
Turn off background app refresh and auto-play video.
Install the eSIM before you travel and check that your phone is unlocked.

Frequently asked questions

How much data do I need for a week abroad?

A light user with maps, messaging and some browsing may use around 3 to 5 GB a week, while heavy video and social use can need 10 GB or more. Use the calculator for your own habits.

Is an eSIM cheaper than roaming?

Often yes for trips of several days, but compare the price of an eSIM plan with your roaming plan and a local SIM. Check the Airalo page for current offers.

What uses the most data?

Video streaming and video calls use the most. Switching video to standard quality, using Wi-Fi at your hotel and downloading offline maps and playlists cuts data a lot.

Should I buy a bigger plan to be safe?

A small buffer is wise, which the calculator adds. Buying a much bigger plan costs more, and you can usually top up if you run out.

Do I need a compatible phone?

Yes. Your phone must support eSIM and be network unlocked. Check your model before you buy a plan.

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This calculator gives estimates for planning only. It is not financial, tax or legal advice. Confirm exact figures with your employer, bank, lender or the relevant government agency.