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.
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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
How much mobile data do I need for a trip?
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.
What uses the most data?
Video, by a wide margin. Streaming in HD runs around 3 GB an hour, against roughly 0.7 GB in standard definition — so a single quality setting can triple your usage. Video calls are next at about 500 MB an hour, then social media at around 150 MB. Maps, messaging and music are comparatively tiny. The single biggest saving is to stream and download on Wi-Fi, and watch in SD when you’re on mobile data.
Is an eSIM cheaper than roaming?
Usually, yes — often dramatically so. Roaming on your home plan can cost several times more per gigabyte than a local prepaid travel eSIM, and some carriers charge daily roaming fees on top. An eSIM lets you buy a data bundle sized to your trip, activate it before you land, and avoid bill shock. The catch is that your phone must be eSIM-compatible and unlocked, which most recent phones are.
How accurate is this estimate?
Treat it as a planning figure, not a guarantee. The per-hour rates it uses are typical industry values, but real usage swings with the specific apps, their quality settings, background activity like photo backups, and network conditions. That’s why the tool adds about 20% headroom on top and rounds up to a common plan size. If you tend to run over, size up one tier — running out abroad is more painful than a little spare data.
How can I use less data abroad?
Download before you go: offline maps in Google Maps, playlists in Spotify, and shows on Netflix or YouTube while you’re on hotel or home Wi-Fi. On the road, set streaming apps to standard definition, turn off auto-play video and auto-backup of photos, and use Wi-Fi calling where you can. These few changes routinely cut mobile data use by more than half.
