Travel eSIM Data Calculator: How Much Data Do You Actually Need?
Last updated: August 2026 | Tom Solo Travels
Buying a travel eSIM always comes down to one question: how much data do you need? Buy too little and you’re rationing Google Maps by day ten. Buy too much and you’ve paid for gigabytes you never touch. After 20+ countries of getting this wrong in both directions, I built the calculator below to answer it properly – using verified per-app data figures, not guesswork.
Tell it how you actually use your phone, and it works out your total for the trip plus the eSIM plan size to look for.
Travel eSIM Data Calculator
Work out how much mobile data you actually need for your trip.
Note: The two biggest data drains are easy to miss: short-form video (TikTok and Reels burn through roughly 850 MB an hour – more than Netflix) and hotspotting a laptop. If you toggle either of those on, expect your recommended plan size to jump.
At a glance: How much data do you actually need for travel?
Most solo travellers use between 1 and 2 GB of mobile data per day. For a two-week trip, that means a 20–30 GB eSIM plan covers the typical traveller comfortably. Light users (maps, messaging, a bit of scrolling) can manage on 5–8 GB for two weeks, while heavy users – daily TikTok, streaming, video calls home – should budget 3.5–4 GB per day and are usually better off with an unlimited plan.
| Traveller type | Data per day | 1 week | 2 weeks | Plan to look for |
|---|---|---|---|---|
| Light user | ~0.4 GB | ~3 GB | ~5 GB | 5–10 GB |
| Typical traveller | ~1.7 GB | ~12 GB | ~24 GB | 20–30 GB |
| Heavy user | ~3.9 GB | ~27 GB | ~54 GB | 50 GB or unlimited |
| Digital nomad (with hotspot) | ~4–5 GB | ~30 GB+ | ~60 GB+ | Unlimited |
These figures include a 20% safety buffer – the same buffer the calculator applies – because running out of data in a country where you can’t read the top-up instructions is a special kind of stress.
How does this eSIM data calculator work
The maths is deliberately simple and fully transparent: your daily hours of each activity are multiplied by a verified data rate, summed, multiplied by your trip length, and given a 20% buffer for app updates, retries, and everything you forgot to count.
I’ve checked every rate against published figures rather than pulling numbers out of the air – because a data calculator is only useful if the data behind it is right.
Mobile data usage by app: the verified numbers
| Activity | Rate used | How it was verified |
|---|---|---|
| Maps & navigation | 5 MB/hour | Standard turn-by-turn navigation runs 3–5 MB/hr; live traffic pushes it to 7–10 MB/hr. One of the lightest apps on your phone. |
| Social media scrolling | 250 MB/hour | Mixed feed browsing. This is the most variable figure - a video-heavy Instagram feed has been independently measured at over 800 MB/hr, while photo-and-text scrolling uses far less. |
| Short-form video | 850 MB/hour | Multiple independent tests place TikTok at roughly 840–900 MB/hr on default settings; 480p drops it to ~600 MB, 1080p pushes it to ~1.5 GB. Instagram Reels is comparable. |
| Video streaming | 1 GB/hour | Netflix's own published figure for standard-definition streaming. Its mobile "Automatic" setting can use as little as 250 MB/hr, so this is a safe upper planning figure. |
| Music & podcasts | 75 MB/hour | Matches Spotify's High quality tier (72 MB/hr) per Spotify's documented settings. Normal quality uses ~43 MB/hr; Very High ~144 MB/hr. |
| Video calls home | 300 MB/hour | WhatsApp video at standard quality (see WhatsApp's data settings); FaceTime runs ~250 MB/hr and Zoom is the heavy one at ~540 MB/hr. |
| Browsing & messaging | 60 MB/hour | Planning estimate for booking sites, research and messaging - texts themselves are near-zero. |
| Cloud photo backup | 500 MB/day | Assumes 100–150 photos and a few short clips backing up daily. Videographers should assume more. |
| Laptop hotspot | 1 GB/day | Tethered browsing and work. Streaming through a hotspot uses exactly the same rates as on your phone, so add streaming hours on top. |
Last verified: August 2026. Real-world usage varies with signal strength, app settings, and how video-heavy your feeds are – which is exactly why the calculator adds a 20% buffer on top.
7 tips to using less data when travelling.
- Download offline maps before you land. Google Maps navigation inside a downloaded map uses almost nothing – this is the single biggest saver. More pre-departure prep in my solo trip planning hub.
- Download playlists and shows on hotel Wi-Fi. Streaming is the biggest drain in the calculator; downloaded content uses zero mobile data.
- Turn on data saver in TikTok and Instagram. Cuts short-form video usage by roughly half.
- Switch video calls to voice. A WhatsApp voice call uses about a tenth of the data of a video call.
- Turn off cloud photo backup on mobile data. Set Google Photos or iCloud to back up on Wi-Fi only – otherwise it silently eats 500 MB+ a day.
- Drop Netflix to the Save Data setting. Stretches 1 GB from one hour of viewing to roughly six.
- Set your eSIM as data-only and keep your home SIM active for calls and texts. You’ll still receive bank verification texts without racking up roaming charges.
Tom's top eSIM picks
Once the calculator has given you a number, these are the three providers I’d point you to first. They each solve a different version of the problem, so match the pick to your traveller type rather than just grabbing the cheapest.
Airalo
Best all-rounder for most trips
The biggest name in travel eSIMs, with coverage in 200+ countries and plans at pretty much every size the calculator recommends – from small 1-5 GB single-country packages up to regional plans that cover all of Southeast Asia on one eSIM. If the calculator put you in the light or typical range, Airalo’s country-specific plans are usually the best-value way to hit that number without paying for headroom you won’t use.
You can use my code TOM61806 to get £2.50 off your first Airalo esim purchase
Saily
Best for flexibility and topping up
Built by the team behind NordVPN, Saily’s strength is how easy it makes staying in control: a straightforward app, quick top-ups if you underestimated, and built-in security features like ad blocking and web protection that are genuinely useful on the sketchy public Wi-Fi you’ll inevitably end up on. A good match for typical travellers who’d rather start smaller and top up than commit to a big plan upfront.
You can use my code TOMSOLOTRAVELS to get $5 off your first saily esim purchase
Holafly
Best for heavy users who don’t want to think about it
Holafly’s whole pitch is unlimited data, and that’s exactly who it’s for. If the calculator landed you at 3.5+ GB a day – daily streaming, TikTok, video calls home, or hotspotting a laptop – an unlimited plan stops the maths mattering entirely. You’ll pay more than a fixed-GB plan, but you’ll never watch a data counter again. Worth noting: some unlimited plans limit hotspot use, so check before buying if tethering is part of your setup.
Some links in this section are affiliate links, which support the free tools on this site at no extra cost to you.
Frequently asked questions
For a typical two-week Thailand trip – daily maps, social scrolling, some TikTok and a few video calls home – budget around 20–25 GB. Thailand has excellent, fast 4G/5G coverage and cheap data, so unlimited local plans are also easy to find. If you’re mostly on hostel and café Wi-Fi, 10–15 GB is realistic. Planning the wider trip? Start with my Thailand solo travel hub.
For a light user, yes – 5 GB covers a week of maps, messaging, browsing and moderate social media. It is not enough if you stream video, watch TikTok daily, or hotspot a laptop; any one of those habits can burn 5 GB in two to three days.
For most travellers, 1 GB a day is comfortable as long as heavy streaming happens on Wi-Fi. The calculator’s “typical traveller” preset lands around 1.7 GB per day including its safety buffer, so 1 GB a day suits people slightly lighter than average.
Short-form video is the biggest surprise: TikTok and Reels use around 850 MB an hour – nearly as much as Netflix – because clips autoplay and preload continuously. The other big drains are video streaming (about 1 GB per hour), video calls (about 300 MB per hour), and automatic photo backup quietly uploading in the background.
No – it’s one of the lightest apps you’ll use abroad, at roughly 3–5 MB per hour of navigation. You could navigate all day for less data than one minute of TikTok. Satellite view and Street View are the exceptions, so stick to the standard map when you’re off Wi-Fi.
Only if you’re a heavy user: daily streaming, hours of short-form video, video calls, or hotspotting a laptop for work. At 3.5–4 GB per day, fixed plans stop making sense and unlimited becomes the cheaper, stress-free option. Everyone else overpays for unlimited.
The hotspot itself adds nothing – your laptop simply uses data at the same rates as your phone. Budget about 1 GB per day for tethered browsing and work, and add streaming on top at the normal rate (an hour of Netflix through a hotspot is still ~1 GB).
Every per-app rate is checked against published figures – including Netflix’s official streaming rates and Spotify’s documented quality tiers – and deliberately sits at the mid-to-upper end so the recommendation errs on the side of headroom. The full methodology and sources are in the table above. Your real usage will vary with signal, settings and habits, which the 20% buffer is there to absorb.
The Solo Travel Budget Calculator works out what your whole trip costs – accommodation, food, transport, activities. This one solves a single question inside that budget: what size data plan to buy. Use them together when planning: budget first, then data.