How many GB do I need for my trip? Estimate it by activity
Generic "GB per week" advice ignores the thing that matters, which is what you will do. This is the lab method: activities × hours × a published or measured rate, with a buffer and a daily-cap check.
Multiply the hours you will spend on each activity by a per-hour range, add uploads, multiply by trip days and add a 10–20% buffer. Video and calls usually decide the answer: an hour of video calls can use more than a week of maps. If a plan caps full-speed data per day, check your heaviest day too.
What is the simplest accurate way to estimate travel data?
Split the trip into activities, because each one uses data at a very different rate. The formula is plain arithmetic:
Trip GB = Σ (hours per day × GB per hour) × days + uploads + buffer
The hard part is the rates. Where an app or OS vendor publishes a figure, we use it. Where none exists, we give a wide planning range and a way to measure your own. Here is the table the GB estimator uses:
How much data does each activity use per hour?
| Activity | Typical range per hour | Where the figure comes from |
|---|---|---|
| Maps and navigation | 5–60 MB | TripoSIM help (5–10 MB/h navigation) + planning headroom |
| Web, email and messaging | 20–120 MB | Planning assumption; varies with photos and video in chats |
| Social feeds with video | 0.17–0.7 GB | Planning assumption, set like mobile video streaming |
| Video: Netflix mobile Save Data / Low | 0.17–0.3 GB | Netflix Help Center |
| Video: Netflix Medium | up to 0.7 GB | Netflix Help Center |
| Video: Netflix HD | up to 3 GB | Netflix Help Center |
| Music: Spotify Normal to Very high | 43–144 MB | Spotify bitrates × 0.45 |
| Video call, 1:1 (Zoom high quality to 720p) | 0.54–1.08 GB | Zoom bandwidth figures, up + down |
| Laptop on hotspot, light work (no calls) | 0.2–0.6 GB | Planning assumption; updates and sync excluded |
| Photo upload | 2–5 MB per photo | Planning assumption; check your photo sizes |
Two things stand out. Video and calls are measured in GB per hour. Maps, messaging and music are measured in MB. Getting the video and call hours right matters far more than getting the map hours exactly right.
How do I estimate my trip step by step?
- List what you will do. Write down each activity: maps, messaging and web, social feeds, video, music, calls, laptop use, photo uploads.
- Give each one hours per day. Use a typical day of the trip, not your home routine. Be honest about video and calls.
- Multiply by a per-hour range. Use the low and high figure for each activity from the reference table, or your own measured rate.
- Add uploads and background use. Count photos and clips you will upload, and leave room for app activity you did not plan.
- Multiply by trip days and add a buffer. Use the top of the range and add 10–20% so you are not topping up on the last day.
- Check your heaviest day against any daily cap. If a plan limits full-speed data per day, compare your heaviest day with that amount, not your trip total.
- Measure on day one and adjust. Read the phone's per-app counter after the first day and top up or change habits early.
Three worked trips
All three use the ranges above. They are examples to show the arithmetic, not offers or forecasts for you.
A: Four-day city break, phone only
| Activity | Hours/day | Per day (low–high) |
|---|---|---|
| Maps | 2 | 10–120 MB |
| Web and messaging | 2 | 40–240 MB |
| Social feeds | 0.5 | 85–350 MB |
| Music | 1 | 43–144 MB |
| Photos uploaded | 30 photos | 60–150 MB |
B: Ten-day holiday with evening video
| Activity | Hours/day | Per day (low–high) |
|---|---|---|
| Maps | 1.5 | 8–90 MB |
| Web and messaging | 2 | 40–240 MB |
| Social feeds | 1 | 170–700 MB |
| Video, Netflix Save Data/Low | 1 | 170–300 MB |
| Video call home (1:1) | 0.25 | 135–270 MB |
C: Two-week work trip with a laptop
| Activity | Hours/day | Per day (low–high) |
|---|---|---|
| Video meetings (1:1 to 720p) | 1.5 | 0.81–1.62 GB |
| Laptop on hotspot, light work | 3 | 0.6–1.8 GB |
| Maps | 1 | 5–60 MB |
| Web and messaging | 2 | 40–240 MB |
The work trip shows why the range matters: the same habits can come out at 20 GB or 52 GB depending on video quality and how much the laptop syncs. Our laptop hotspot guide shows how to hold it near the low end.
How do daily caps change the estimate?
A plan sold as unlimited often gives a fixed amount of full-speed data per day and then slows down. For those plans the trip total matters less than your heaviest day. In example C, a 1.5-hour meeting day already reaches 0.81–1.62 GB before any laptop use. On a plan with 1 GB a day at full speed, the afternoon could run on the slowed speed.
The fair-use reading guide shows which lines of a plan to check, and the throttling guide shows how to tell when you have hit a cap.
How do I replace our ranges with my own numbers?
A day of measuring at home beats any table, ours included:
- iPhone: Settings → Cellular lists data per app for the current period. Tap Reset Statistics at the bottom the day before you measure.
- Pixel and many Android phones: Settings → Network & internet → SIMs → App data usage, with a date range picker.
- Turn Wi-Fi off for a representative half-day and use your phone the way you will on the trip. Divide each app's figure by the hours you used it.
Then type your rates over ours in the GB estimator. On the trip, check the same screen after the first day. That is the earliest, cheapest moment to top up or change a habit.
Frequently asked questions
How much data do I need for a week abroad?
It depends on what you do, not on the week. Maps, messaging and music for a week can fit in about 1–2 GB, while an hour of video calls or HD video a day can add many GB. Use the steps on this page or the GB estimator to get a range for your own plans.
Should I buy a bigger plan just in case?
Add a buffer of 10–20% on top of the high end of your estimate. Beyond that, a plan you can top up is often more flexible than buying far more than you need. TripoSIM says top-ups can be bought from its dashboard when a plan supports them.
Is a daily-cap "unlimited" plan better than a fixed GB plan?
It depends on how even your days are. A daily cap suits steady use below the cap. A fixed total suits uneven use, such as one heavy work day and several light ones. Compare your heaviest day with the daily full-speed amount.
How accurate are online data calculators?
They are only as good as their assumptions. Use one that shows its per-hour rates and lets you change them. Measuring your own apps for a day before the trip will always beat a generic figure.
Sources and how we checked
- Netflix Help Center: How to control how much data Netflix uses
- Spotify Support: Audio quality
- Zoom Support: system requirements and bandwidth
- TripoSIM help centre (FAQ)
- Apple Support: Use cellular data on your iPhone or iPad
- Pixel Phone Help: Reduce and manage mobile data usage
Figures were read from these pages on 6 November 2026. Apps change their settings and rates; if a number here disagrees with the app on your phone, trust your phone's own data counter. See how we get our figures.