TRAVEL DATA
How much mobile data will your trip need?
Trip length is only the starting point. Video quality, autoplay, cloud backup and tethering usually decide how many gigabytes you should buy — more than the number of days.
Quick answers
How much mobile data does an international trip need?
A week of maps and messaging is often 2–3 GB in this site’s tool (maps ~10 MB/hour, social ~150 MB/hour, plus ~50 MB background and 20% buffer). Add about 5 GB for an hour of SD video each day and round up to 10 GB. Two hours of HD a day can exceed 50 GB. Split by app, then add about 20% buffer.
How much data does navigation use per day?
This site’s data tool uses about 10 MB per hour. Two hours of live navigation is about 20 MB; four hours of driving about 40 MB. Downloading offline maps before you go cuts live tiles further.
Is unlimited travel data actually unlimited?
Most travel plans throttle after a gigabyte cap. Maps usually still work; HD video does not. Read the cap and whether hotspot use shares the same allowance.
Does tethering count against the plan?
Yes. A laptop or a companion’s phone on your hotspot uses the same SIM. Add each device’s estimate when several people share one plan.
01Split by app, not only by days#
Maps and messaging are usually modest; short video, HD streaming and cloud backup are not. List the apps you will actually open and for how long, then run this site’s data estimator. That is closer to reality than “a few hours on the phone each day.”
The same hour can differ by an order of magnitude: standard-definition video is about 700 MB per hour, HD about 1.5 GB, and navigation in this site’s data tool is about 10 MB per hour. Decide first whether you will watch video on mobile data, then pick a plan size.
02Where daily usage comes from#
The table uses this site’s data-estimator rates, converted into a day’s total so you can check it against the calculator. Navigation assumes maps left open in the car or on foot; video assumes playback on mobile data; social includes a feed. OS updates, photo sync and tethering are extra.
Add the rows (each is a daily total, not an hourly rate), multiply by the number of days, and that is the baseline. The tool then adds about 20% buffer.
| Use | Light day | Typical day | Heavy day | Notes |
|---|---|---|---|---|
| Maps / navigation | ~5 MB (0.5 hour) | ~20 MB (2 hours) | ~40 MB (4 hours) | About 10 MB/hour in the tool |
| Streaming video | Autoplay off ≈ 0 | ~0.7 GB (1 hour SD) | ~4.5 GB (3 hours HD) | SD ~700 MB/hour; HD ~1.5 GB/hour |
| Social / short video | ~75 MB (0.5 hour) | ~0.3 GB (2 hours) | ~0.6 GB (4 hours) | About 150 MB/hour in the tool |
| Streamed music | ~30 MB (0.5 hour) | ~60 MB (1 hour) | ~120 MB (2 hours) | About 60 MB/hour in the tool |
| Background | ~50 MB | ~50 MB | ~50 MB | Fixed daily add-on in the tool; cloud backup is extra |
03Leave room for the unexpected#
Add about 20% on top of the baseline for updates, a feed you forgot to mute and an extra stretch of navigation. If you will tether a laptop or a companion’s phone, add that time on its own line: a work call or a file upload can wipe the buffer.
“Unlimited” travel plans almost always throttle after a gigabyte cap. Maps often still work; HD video does not. Read the cap and whether hotspot use counts against the same allowance. When several devices share one SIM, add each device’s estimate. Do not buy for a single person’s habits.
04Data-saving steps before you fly#
Turn off video autoplay, photo and video backup on mobile data, and pause OS auto-updates. On home Wi-Fi, download offline maps, language packs and the playlists you will actually listen to. None of that raises the plan price, and it can drop you a tier.
Pin video quality to standard or data-saver and lift it only when you need to. Prefer downloaded map regions and keep live traffic as the online layer. Turn the hotspot on only when nothing else is available, then turn it off.
05Two worked estimates#
Example 1: seven days with almost no video on mobile data. One hour of maps (~10 MB) plus one hour of social (~150 MB) plus the tool’s ~50 MB background is about 210 MB a day, ~1.5 GB over seven days; with 20% that is ~1.8 GB, so round up to 3 GB. Buy 5 GB if you want slack for delays. Add one hour a day of SD video (~700 MB) and the seven-day baseline is ~6.4 GB, ~7.6 GB with the buffer — a 10 GB round-up.
Example 2: 14 days with two hours of HD video a day (~1.5 GB/hour), two hours of social and one hour of streamed music is about 48 GB; with the buffer it is close to 58 GB. That trip fits a top-up plan or a large package that throttles after a cap, not a 5 GB SIM and a hunt for Wi-Fi. Codecs change; rerun this site’s data tool with your own hours.
06Common mistakes#
Typical mistakes: buying a small pack for HD hours, ignoring autoplay, updates and photo sync, and treating an unlimited plan’s throttle point as truly unlimited. Tethering counts against the same allowance; an hour of laptop meetings can equal half a day of navigation.
Another is buying only by trip length. The same seven days can be 3 GB if you only navigate and message, or 10 GB if you watch video in the hotel. Fix the video and hotspot switches first, then look at days. Check coverage too: a multi-country trip should not be a single-country pack.
07How to choose a plan#
On a short trip, a plan you can top up is usually better than buying far too much. Check throttling, whether tethering is allowed, which countries are covered and when the plan starts (after boarding or after landing). eSIM and physical SIMs use the same data maths; only installation differs.
The gigabyte figures on this page are planning ranges. Before you pay, read the provider’s terms and put your days and uses into the data estimator. If the trip is rich in Wi-Fi, drop a tier. If you will be on the road, live-streaming or in calls, use the heavy row and keep the buffer.
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MORE GUIDES
Keep reading before you go
Check these before travelling with an eSIM.
Do not wait until arrival to discover an incompatible phone, an expired QR code or the wrong data line. Installing and activating are two steps: install while you have internet, turn data on after you land.
Europe: is one regional eSIM enough for several countries?
Paris to Rome to Barcelona is a network-switch problem, not a reason to buy three SIMs. First ask whether you already have EU roam-like-at-home on a home plan, then check whether the regional eSIM list includes the UK and Switzerland.
Visiting the US: travel eSIM, prepaid or home roaming?
New York, Los Angeles or a national-park loop all need data for maps and ride-hailing. This page is for inbound visitors and short stays. It does not assume which country you flew from. Start from trip length, whether you need a US number, and whether you can install a profile before take-off.