Free calculator

How much mobile data do you need?

Estimate a practical data range from your trip length and phone habits, then compare eSIM providers.

Maps, messaging and typical social use are included in this level.

Typical data for normal daily use

Same assumptions as the calculator with no extra video, music or calls. Open a row to pre-fill the trip length.

7 days · 14 days · Japan 14 days · Thailand 14 days

Common questions

Does this include hotel Wi‑Fi?

No. It estimates mobile data on a phone plan or eSIM. Hotel or café Wi‑Fi can reduce what you need, but it is not counted here.

Why is there a range instead of one number?

Usage varies by day. The lower figure is a lean estimate; the higher figure adds about 20% as a buffer so you are less likely to run out.

Are Saily and Airalo ranked by price?

No. They are listed as common eSIM starting points. Always compare live destination plans before buying.

Trip lengthEstimated rangePlanning size
7 days3–5 GB5 GB
14 days6–9 GB10 GB
21 days8–13 GB10 GB may be tight; 15 GB is safer
30 days12–18 GB15 GB may be enough; 20 GB is safer