How much data do you actually need for a trip?
Buying a travel data plan comes down to one nervous question: how many gigabytes is enough? Too little and you're rationing maps on day three; too much and you've paid for data you never touched.
This guide gives you real numbers, what each app actually uses, what a typical travel day adds up to, and a simple recommendation by trip length.
The short version
For most travellers it's less than you'd expect, usually somewhere between 500 MB and 1 GB a day because the apps you lean on most while travelling (maps, messaging) are surprisingly light, and the heavy ones (streaming, video) are mostly optional on the road.
Quick pick (one-week trip)
- Light user: the 5 GB plan
- Average user: the 10 GB plan
- Heavy user (streams and video-calls): the 20 GB plan
First, the units
Mobile data is measured in megabytes (MB) and gigabytes (GB). 1 GB ≈ 1,000 MB. That's the only maths you need.
The trick is knowing that a "1 GB" plan sounds small but covers a lot of map navigation and messaging — and almost no high-definition video.
How much data each activity uses (per hour)
These are typical real-world figures. Your mileage varies with signal quality and settings, but the order of magnitude is what matters.
| Activity | Data per hour | Notes |
|---|---|---|
| Messaging (text) | ~5–10 MB | WhatsApp, iMessage, LINE. Basically free |
| Maps / navigation | ~3–10 MB | Standard view; live traffic pushes it higher |
| ~10–20 MB | Heavier with attachments | |
| Web browsing | ~50–70 MB | Text-and-image sites; varies a lot |
| Music streaming | ~150 MB | High quality |
| Social media (browsing) | ~100–200 MB | Light feeds lower; video-heavy feeds much higher |
| Social media (video, e.g. TikTok/Reels) | ~700 MB–1 GB | Autoplay video is a real data drain |
| Video calls (WhatsApp/Zoom) | ~300–700 MB | Higher on fast 5G connections |
| Video streaming — SD | ~1 GB | Netflix/YouTube at low quality |
| Video streaming — HD | ~3 GB | The single biggest consumer |
| Video streaming — 4K | ~7 GB | Avoid on mobile data entirely |
The takeaway
Maps and messaging are featherweights. A whole day of navigating a new city might use 30–50 MB of map data.
What actually empties a plan is video: scrolling reels, streaming shows, long video calls — plus a couple of silent background culprits.
The silent data drains
These catch people out because they happen without you opening an app:
- Automatic photo/cloud backup: Uploading every holiday photo and video to iCloud or Google Photos can burn gigabytes without you noticing. Switch backup to Wi-Fi only before you travel.
- App and OS updates: Set these to Wi-Fi only too.
- Background app refresh: Apps quietly fetching data in the background. Worth limiting for the trip.
- Auto-play video: Disable it in your social apps and you'll cut their usage dramatically.
Handle these four and a modest plan stretches a long way.
What kind of traveller are you?
Place yourself in one of these, then use the trip-length table below.
- Light: maps, messaging, occasional browsing, a quick social check. No streaming on mobile data. ≈ 300–500 MB/day.
- Average: all of the above plus daily social scrolling, the odd video call home, posting photos and stories, some browsing. ≈ 1 GB/day.
- Heavy: frequent video calls, streaming music and video on the go, uploading clips, tethering a laptop, always-on social video. ≈ 2–3 GB/day.
How much data by trip length
A practical guide, mapped to our plan sizes (1, 3, 5, 10, 20 GB) and including a small safety buffer. Round up if you're unsure. Running out mid-trip is far more annoying than a little spare.
| Trip length | Light | Average | Heavy |
|---|---|---|---|
| Weekend (3 days) | 1 GB | 3 GB | 10 GB |
| 1 week | 3 GB | 10 GB | 20 GB |
| 2 weeks | 5 GB | 20 GB | 20 GB + top-up |
| 1 month | 10 GB | 20 GB + top-up | 20 GB + top-ups |
If you're right on the edge between two plans, size up. The price gap between tiers is usually small next to the hassle of topping up abroad.
For long or heavy-use trips beyond 20 GB, you can stack a top-up, and it's worth checking whether a local long-stay option makes more sense.
A word on "unlimited" plans
Unlimited sounds like the safe choice, but read the fine print. Many unlimited travel plans have a fair-use cap, a daily or total high-speed allowance, after which your speed is throttled to a crawl.
If you're a genuinely heavy user, check what the high-speed portion actually is; sometimes a large fixed-data plan gives you more usable fast data than an "unlimited" one.
How to stretch your data further
- Download offline maps before you go. In Google Maps, save your destination over Wi-Fi. Navigation then uses almost no mobile data.
- Download shows and playlists on Wi-Fi at the hotel for the plane, train, or downtime.
- Turn on Data Saver / Low Data Mode in your phone settings and in apps like YouTube and Instagram.
- Backups and updates on Wi-Fi only.
- Check your usage as you go. Both iPhone and Android show per-app data use in settings, so you can spot a hog early.
So, what should you buy?
- Pick your traveller type (light / average / heavy).
- Find your trip length in the table.
- Round up a tier if you'll stream, video-call a lot, or tether.
Explore Vell Travel eSIM to browse destinations and choose a data plan.