When you set up an eSIM for an international trip, "How many gigabytes should I buy?" is usually the first thing to puzzle over. The short answer: for typical use—maps, social media, and messaging apps like WhatsApp—plan for roughly 0.5 to 1GB per day. For a short 3–4 day trip, that's around 3GB; for a week, 5–10GB; and if you'll be away for two weeks or more, or you stream a lot of video, an unlimited plan is worth considering. This article breaks down data estimates by trip length and usage style in easy-to-read tables, and walks first-timers through what to do when you're not sure it'll be enough. If you'd like to start by lining up plans for your destination side by side, take a look at our eSIM comparison page.
The Short Answer: Data = Days × How You Use It
Choosing a data amount doesn't have to be complicated. It really comes down to just two things:
- How many days you'll be using it
- How heavily you use data each day (light / moderate / heavy)
Multiply those two together and you'll get a rough sense of how many gigabytes you need. To give you the big picture first, we'll walk through daily estimates by activity, then total estimates by trip length. Keep in mind that your actual usage can shift depending on which apps you use and how many photos or videos you share, so treat these as estimates and give yourself a little headroom. If you'd rather jump straight to plans that fit your needs, our eSIM guide is a helpful companion.
What Uses Data, and How Much? Estimates by Activity
Knowing roughly how much data common activities use makes it much easier to picture what you'll need. The table below shows general estimates; actual figures vary with video quality, settings, and network conditions.
| Activity | Approximate data use |
|---|---|
| Maps and navigation (1 hour) | ~5–10MB |
| Messaging apps such as WhatsApp (per day) | ~10–30MB |
| Web search and reading news (1 hour) | ~10–30MB |
| Browsing social media (1 hour) | ~100–300MB |
| Music streaming (1 hour) | ~50–100MB |
| Video streaming, standard quality (1 hour) | ~300–700MB |
| Video calls (1 hour) | ~300–600MB |
The key takeaway: maps, messaging, and search use surprisingly little data, while video on social media, video streaming, and video calls can eat through it quickly. Picturing what you'll use most while traveling makes it much easier to estimate the right amount.
Data Estimates by Trip Length
Here are rough total estimates by how long you'll be away. "Light" means mostly maps, search, and messaging; "Moderate" adds regular social media browsing; and "Heavy" assumes plenty of video and video calls too.
| Trip length | Light | Moderate | Heavy |
|---|---|---|---|
| 1–2 days | 1GB | 2–3GB | ~5GB |
| 3–4 days | 2–3GB | 3–5GB | ~8GB |
| 5–7 days | 3–5GB | 5–10GB | 10GB+ / unlimited |
| 8–14 days | 5–8GB | 10–15GB | Unlimited for peace of mind |
| 15+ days / long stays | ~10GB | 15GB+ | Unlimited worth considering |
The longer you stay, the more your total need adds up, and the more it makes sense to look at an unlimited plan if you're a heavy daily user. If your trip is short and your usage is light, a small-data plan is often plenty.
Choosing by Usage Type
Numbers alone can be hard to act on, so here's a way to think about it by usage style.
The budget-conscious, stay-in-touch type
Mostly maps, messaging, and the occasional search. Around 0.5GB a day is often enough, and for short trips a small-data plan keeps costs down.
The enjoy-the-trip, everyday type
Posting photos to social media, looking things up—typical all-around use. Plan for about 1GB a day and choose based on your trip length for a good balance.
The video-and-tethering type
Watching video on the go, or connecting a laptop or tablet (tethering). Since this uses a lot of data, a large-data or unlimited plan is the safer bet. Note that whether tethering is allowed, and any conditions around it, can differ from plan to plan—so check before you buy.
What to Do When You're Not Sure It'll Be Enough
Worrying about whether you've bought just enough is common, especially the first time. Here are three ways to think about it.
1. Give yourself a little headroom
Rather than the exact amount, choosing one size up brings peace of mind. While traveling, you'll often reach for maps and quick searches more than you'd expect.
2. Use Wi-Fi alongside your eSIM
Connecting to Wi-Fi at your hotel or a café means you're not using your eSIM data during that time. Doing video and app updates over Wi-Fi helps stretch your allowance.
3. Consider unlimited if you use a lot—or just can't predict it
If your trip is long, you watch video daily, or you simply don't want to track your remaining data, an unlimited plan is worth a look. Just keep in mind that "unlimited" doesn't mean completely without any conditions.
What to Know Before Choosing an Unlimited Plan
Unlimited plans suit travelers who'd rather not keep an eye on their remaining data, but they commonly come with conditions like these:
- A fair-use policy (speeds may be reduced after very heavy use)
- Tethering availability and any data conditions, which vary by plan
- Speeds that depend on the local network, area, and time-of-day congestion
These are common to many unlimited eSIMs, and "unlimited" doesn't always mean consistently fast no matter how much you use. While such plans are convenient for long or data-heavy use, knowing these conditions in advance means no surprises once you arrive. For how unlimited plans work and what conditions apply, check our guide to unlimited eSIMs and the unlimited plan pages for the latest details.
If You Run Low on Data
If your data starts running low mid-trip, there's no need to worry. With Bloomy, you can top up data on the eSIM you're already using. Instead of buying a whole new plan, you can simply add more data to the same eSIM and keep going.
We also offer auto-recharge, which automatically adds data when you're running low (it's off by default, so only those who want it can turn it on). If you'd like to avoid the worry of "running out right when I need the map," features like these are worth considering. You can check your remaining data anytime from My Account after purchase.
Note that Bloomy plans are data-only. They don't include a phone number, SMS, or voice calls. If you need to make voice calls or have a number while abroad, you can use data-based calling apps such as WhatsApp, or arrange a separate option that includes a number.
Choose and Compare Data Amounts with Bloomy
Once you have a sense of the right amount for you, all that's left is to pick a plan. On Bloomy's comparison page, you can set your destination country or region, data amount, and trip length to line up matching plans side by side. Whether it's "short trip, small data," "a week of moderate use," or "long stay, unlimited," use the estimates in this article as your starting point.
Before you set things up and get started, it's a good idea to confirm that your phone supports eSIM. Check our compatible devices list ahead of time. Plan details and pricing are subject to change, so please confirm the latest information at the time of purchase.
