Data usage calculator
How much mobile data do you need for your trip? Our data usage calculator estimates your monthly data usage. Just pick your activities and how long you spend on them each day.
Estimate your data usage in hours
Find out how much data you’ll need for your trip based on how you use your phone.
Pick a profile that matches your habits
You can adjust every activity afterwards.
How much time do you spend per day?
Select the hours for each activity or enter your own. Tap again to deselect.
What is mobile data usage?
Mobile data usage is the amount of data your phone sends and receives over the mobile network when you are not on Wi-Fi. Every video, map, photo upload and app update counts towards your plan.
When you travel, you rely on mobile data far more than at home: for maps, translations, tickets and staying in touch.
How do you calculate your data usage?
No more guessing how many gigabytes to pack for your trip. Our calculator turns your daily phone habits into a clear data estimate, so you only pay for what you really use.
Behind the scenes, it multiplies the time you spend on each activity by its typical data use and adds everything up. All you have to do is follow three quick steps:
- 1Choose the profile that sounds most like you, or go with “Personalized” to start from scratch.
- 2Set how many hours a day you spend on social media, streaming, video calls, maps and more.
- 3See your estimated data usage and the plan size that fits your trip best.
How we estimate your data usage
Your data needs depend on how you use the internet. See how much data common activities typically use per hour.
| Activity | Data per hour | 1 GB lasts about |
|---|---|---|
| Social media | 600 MB | 1.7 hours |
| Video streaming (HD) | 1.5 GB | 0.7 hours |
| Short videos | 840 MB | 1.2 hours |
| Music & podcasts | 70 MB | 14 hours |
| Navigation | 10 MB | 100+ hours |
| Web browsing | 50 MB | 20 hours |
| Messaging & email | 5 MB | 100+ hours |
| Video calls | 800 MB | 1.3 hours |
| App downloads & updates | Varies by app | Depends on file size |
Estimates only. Actual data usage may vary depending on video quality, app settings, and network conditions.
Know your data needs? Find your plan.
Choose your destination and pick the data plan that matches your estimate, or go Unlimited.
Frequently asked questions about data usage
How much mobile data do I need?
It depends on how you use your phone. Our data calculator gives you a personal estimate. Just enter how many hours a day you spend on social media, streaming, navigation, video calls, and more.
Two examples from the calculator:
- Casual browser: a bit of social media, music, maps, browsing, and messaging. About 670 MB a day, or around 22 GB a month
- Remote worker: music, browsing, lots of messaging, and two hours of video calls a day. About 2.1 GB a day, or around 65 GB a month
If you make video calls or stream every day, plan for 50 GB or more. For heavy use, an unlimited data plan is often the better choice.
How many GB of mobile data does the average person use per month?
In Western Europe, the average smartphone used about 22 GB of mobile data per month in 2024, according to the Ericsson Mobility Report. Your own usage can be much lower or higher. HD streaming and automatic photo backups make the biggest difference. Use our data calculator to see where you stand.
How long does 1 GB of data last?
It depends on what you’re doing. Everyday activities like sending messages, writing emails, and using navigation use very little data, so 1 GB lasts more than 100 hours. Web browsing is also light: 1 GB gets you around 20 hours of news, search, and shopping. Music and podcasts are similarly kind to your data, with about 14 hours per GB.
Anything with video uses data much faster. Scrolling through social media feeds with videos uses up 1 GB in about 1 hour and 40 minutes, video calls in about 1 hour and 15 minutes, and short videos like TikTok or Reels in about 1 hour and 10 minutes. HD video streaming on a phone is the most data-hungry activity, with 1 GB lasting about 40 minutes.
These are average values from our data calculator. Your actual usage depends on video quality, app settings, and the network.
What activities use the most data?
Video streaming is the clear leader. On a phone, HD video uses about 1.5 GB per hour. On the highest quality setting, it can be much more: Netflix says HD can use up to 3 GB per hour and 4K up to 7 GB.
Next come short videos like TikTok and Reels at about 840 MB per hour, video calls at about 800 MB, and social media at about 600 MB. Music (about 70 MB per hour) and web browsing (about 50 MB) are much lighter. Navigation and messaging barely register.
The biggest data drains often run in the background: automatic app updates, cloud photo backups, and large downloads.
How can I manage my data usage when traveling abroad?
Before you leave, check your carrier’s roaming terms. Within the EU, many carriers let you use your data at domestic rates, though often with fair use limits. Outside the EU, for example in Switzerland or Turkey, roaming can get expensive fast.
The easiest option is to estimate your needs with our data calculator, then get an eSIM data plan for your destination before you go. Set the eSIM as your line for cellular data and turn off data roaming on your main SIM. That way, you won’t pay any roaming charges. Use Wi-Fi whenever it’s available, such as at your hotel, a café, or the airport.
What happens if I run out of data?
That depends on the provider. Some data plans cut off or throttle your connection until you buy more data or a new billing period starts. Others charge extra fees, which can get expensive quickly, especially when roaming.
With EuroSIM, there are no hidden extra charges. When your data runs out, your data connection stops until you buy a new data plan. If you need more than 50 GB, an unlimited data plan is the better choice.
Which apps use the most mobile data?
Streaming apps like YouTube, Netflix, and Disney+ top the list. Next come short-video and social apps like TikTok, Instagram, and Facebook, followed by video call apps like Zoom, FaceTime, and Google Meet.
Navigation apps like Google Maps use surprisingly little, about 10 MB per hour. Downloading offline maps is a different story, so do that over Wi-Fi before you head out.
Does browsing the internet use more data than social media apps?
No, usually it’s the other way around. Web browsing uses about 50 MB per hour. Social media feeds with videos use about 600 MB per hour, and short-video apps like TikTok about 840 MB. That’s because videos play automatically, photos are high-resolution, and your feed keeps loading new content.
Most social media apps let you cut usage in their settings, for example with a data saver mode or by turning off auto-play.
How much data does it take to download an app?
A download uses as much data as the app’s file size. Simple apps are small, while large games can take up several gigabytes. Updates add up too.
In our data calculator, you can enter how many GB of app downloads and updates you expect per month.
Does updating an app use less data than downloading it?
Usually, yes, because an update often only replaces part of the app. Large updates for games or system apps can still be as big as a new download. Check the size before updating, and save big updates for when you’re on Wi-Fi.
Do email apps use a lot of data?
Generally not. Email and messaging with text only use about 5 MB per hour. Attachments like photos or PDFs use more. Also keep in mind how often your app checks for new messages. Frequent syncing uses data even if you don’t open any emails.
How much data do messaging apps like WhatsApp use?
Text messages use very little data, about 5 MB per hour, emojis included. Photos and videos use more, depending on size and length. Video calls are a different category: at about 800 MB per hour, they’re among the most data-heavy activities.
WhatsApp, Telegram, and Messenger compress photos and videos before sending them. This saves data but lowers the quality. iMessage also runs over mobile data or Wi-Fi, not your SMS allowance.
Why am I using so much data?
Common causes are:
- streaming video in HD
- apps refreshing data in the background
- large downloads like games, updates, or cloud backups
- a hotspot without a strong password that others are using
To find the cause, check your phone’s settings to see which apps use the most data. Pause automatic updates and restrict background data for apps that don’t need to stay up to date. Secure your hotspot with a strong password so you’re the only one using your connection.
What are some tips to reduce cellular data usage?
- Use Wi-Fi when available: Hotels, cafés, and airports often offer free Wi-Fi. Be careful on public networks, though, as they’re often less secure.
- Download content in advance: Get offline maps, playlists, and shows or movies for your flight or train ride while you’re still on Wi-Fi.
- Lower streaming quality: This makes the biggest difference. With Netflix’s Save Data setting, 1 GB lasts about 6 hours instead of around 40 minutes in HD. Spotify on Normal quality uses about 40% less data than on High.
- Turn on data saver mode: iPhone and Android both have a built-in data saver mode that automatically limits background activity.
- Turn off automatic updates: Set app updates and photo backups to run on Wi-Fi only.
How can I use mobile data efficiently when working from home or on the go?
- Video calls are the biggest factor at about 800 MB per hour. Turn off your camera when you don’t need it.
- Save data-heavy tasks like streaming or large downloads for when you’re on Wi-Fi.
- Only use a mobile hotspot when you need to, and connect to secure Wi-Fi networks whenever possible.
- Email, messaging, and document editing use very little data.
- Turn off automatic app updates and cloud backups while you’re working on mobile data.
What is data throttling and how does it affect me?
Data throttling means your connection is intentionally slowed down. It usually happens once you’ve used up the high-speed data in your data plan, but some carriers also throttle during peak hours to manage network traffic. For you, that means slower websites, photos that take ages to load, and choppy video calls.
Whether and when throttling kicks in is defined in your data plan’s terms, often in a fair use policy. This applies to a regular SIM just as much as to an eSIM. To avoid throttling, use our data calculator to estimate how much you need, then pick a data plan with enough data or one without a speed limit.
Does my phone use data when I’m not using it?
Yes. Many apps keep running in the background, syncing email, refreshing feeds, sending notifications, or backing up photos. In your settings, you can restrict background data for individual apps. On iPhone, this is under “Background App Refresh”. When you’re out and about without Wi-Fi, data saver mode helps too.
Do I use mobile data when I’m connected to Wi-Fi?
Usually not. While you’re connected to Wi-Fi, your phone uses Wi-Fi. However, some features automatically switch to mobile data when the Wi-Fi signal is weak.
- iPhone: Go to “Settings” ▸ “Wi-Fi” and turn off “Connectivity Assist”. On older iOS versions, it’s called “Wi-Fi Assist” and is at the very bottom of “Settings” ▸ “Cellular/Mobile Service”.
- Android: On Samsung devices, this feature is called “Intelligent Wi-Fi” and is in your Wi-Fi settings. Other manufacturers use different names.
If your Wi-Fi drops out often, “forget” unstable networks in your Wi-Fi settings. That way, your phone won’t connect to weak signals that trigger the switch to mobile data.
How much data does an eSIM use?
The eSIM itself doesn’t use any data. It’s a digital profile that activates a data plan on your device, no plastic card needed. How much data you use depends entirely on what you do: streaming, browsing, or using apps. You can check your usage in your phone’s settings, just like with any SIM.
Does an eSIM use more data than roaming?
No. Data usage depends on your activities and network conditions, not on whether your SIM is physical or digital. The difference is cost: with an eSIM data plan for your destination, you avoid your carrier’s expensive roaming charges.
How can I check my eSIM data usage?
- iPhone: Go to “Settings” ▸ “Cellular/Mobile Service” and scroll down to see usage for each line. At the very bottom, you can reset the statistics to track usage from a specific date.
- Android: Go to “Settings” ▸ “Connections” ▸ “Data usage” to see how much data your eSIM and individual apps use. Menu names may vary by manufacturer.
Can I share my data with other devices?
Yes, you can share your eSIM data with other devices using your phone’s hotspot feature.
- iPhone: Go to “Settings” ▸ “Personal Hotspot” and turn it on.
- Android: Go to “Settings” ▸ “Connections” ▸ “Mobile Hotspot and Tethering” and turn on “Mobile Hotspot”. Menu names may vary by manufacturer.
Keep in mind that your data runs out much faster when several devices are online at the same time.
How can I check my eSIM hotspot data usage?
Keep an eye on your hotspot usage. Sharing data with other devices uses up your data much faster than normal phone use.
- iPhone: Go to “Settings” ▸ “Cellular/Mobile Service” and tap “Personal Hotspot” in the usage list to see how much data you’ve shared with other devices.
- Android: On Samsung devices, go to “Settings” ▸ “Connections” ▸ “Data usage”. The hotspot usually appears as a separate entry in your eSIM’s data usage.
How can I monitor my data usage across multiple devices?
When you share data with other devices through a hotspot, your phone’s built-in stats often show only part of the usage.
To keep usage under control, turn on data saver mode and turn off automatic updates on every connected device.