Travel Data Calculator
Estimate how much mobile data you’ll use abroad and what size travel eSIM to buy. Set your trip length and how you use your phone — the tool does the rest, with a little headroom built in.
- Free, no sign-up
- Works worldwide
- Instant results
Your daily use (hours per day)
This is an estimate. Actual use varies a lot with apps, video quality and network — the suggested plan adds about 20% headroom. Downloading maps, playlists and shows on Wi-Fi before you go cuts your mobile data sharply.
📶 Need Mobile Data While Traveling?
A prepaid travel eSIM is usually the cheapest way to get roughly 10 GB abroad — activate before you land and skip roaming fees.
Get a Travel eSIM with Yesim →Affiliate link — we may earn a small commission at no extra cost to you.
Rates used (per hour): maps ~5 MB, messaging ~10 MB, browsing ~60 MB, music ~75 MB, gaming ~100 MB, social ~150 MB, video calls ~500 MB, video SD ~0.7 GB / HD ~3 GB. Approximate industry figures cross-checked across carrier and eSIM data references.
How much eSIM data do I need?
For most travellers, 1–2 GB a week covers maps, messaging, browsing and light social use; add music and calls and it’s more like 5–7 GB a week; stream video on mobile data and it can be several GB a day. Set your habits above for a figure tailored to your trip, plus about 20% headroom.
Methodology: The estimate multiplies your hours-per-day for each activity by a typical data rate (maps ~5 MB/hr, messaging ~10, browsing ~60, music ~75, gaming ~100, social ~150, video calls ~500, video ~0.7 GB/hr SD or ~3 GB/hr HD), sums them, scales by your trip length, then adds 20% headroom and rounds up to a common plan size. The rates are approximate industry figures cross-checked across carrier and eSIM data references; real usage varies with apps, quality settings and network, so the result is a planning estimate rather than an exact total. How we test & calculate.
Buy the right amount — not too little, not a fortune
Getting connected abroad used to mean either brutal roaming charges or hunting for a local SIM at the airport. A travel eSIM fixes that — but only if you buy the right size bundle. Too small and you’re topping up at premium rates mid-trip; too large and you’ve paid for gigabytes you’ll never touch. This tool turns how you actually use your phone into a sensible target, so you can pick a plan with confidence.
Video is the whole story
If you remember one thing: video dominates everything else. An hour of HD streaming uses roughly as much data as a whole week of maps, messaging and light browsing combined. Switching video to standard definition, or downloading shows on Wi-Fi first, is the single biggest lever on your usage — far more than anything else you do on the phone. The SD/HD toggle above shows the difference instantly.
Why an eSIM, and what to check
A prepaid travel eSIM is usually far cheaper per gigabyte than roaming, and you activate it before you even land. The main requirement is a recent, unlocked, eSIM-capable phone — most flagships from the last few years qualify. If you’re new to it, the what-is-an-eSIM guide and eSIM vs SIM comparison cover the essentials before you buy.
Round up, then relax
Because real usage is unpredictable, the suggested size adds about 20% on top of the estimate and rounds to a common plan tier. If you’re a heavy streamer or travelling somewhere you’ll lean on mobile data, size up one more tier — a little spare data is cheap insurance against running dry in a place where topping up is awkward.
Frequently Asked Questions
It depends almost entirely on whether you stream video. A light user — maps, messaging, a bit of browsing and social — often needs only 1–2 GB a week. A medium user who adds music and the odd video call might use 5–7 GB a week. Heavy video streaming on mobile data can push that to several GB a day. Set your daily habits above for an estimate tailored to your trip, then add some headroom.
