RoamCalc › eSIM data calculator

How much data do I need for my trip?

Tell us how long you're away and how you use your phone. We'll tell you roughly how many GB to buy.

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You'll need about
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You can install it at home before you fly, then switch it on when you land. Finish checkout in your browser rather than the app.

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How we calculate

ActivityTypical usage
Maps & navigation10 MB / hour
Browsing & messaging60 MB / hour
Social media500 MB / hour
Music streaming100 MB / hour
Video streaming (HD)2000 MB / hour
Video calls700 MB / hour
Photo uploads4 MB / photo

Estimates based on typical app settings. We add a 15% safety buffer, then round up to common eSIM plan sizes.

FAQ

How much data do I need per day in another country?

Most travelers use around 1.2GB per day with maps, messaging, social media and some music. Light users can get by on a few hundred MB, while heavy video streaming can push past 3GB a day.

Does Google Maps use a lot of data?

Hardly any. Navigation uses roughly 5 to 10MB an hour, and offline maps use none at all.

Should I get an unlimited eSIM?

Only if your estimate is above ~3GB per day or you rely on hotspot. Many "unlimited" plans slow down after a daily cap, so check the fair-use policy.

How can I use less data abroad?

Download maps, playlists and shows on Wi-Fi before heading out, turn off auto-play and background app refresh, and upload photos at the hotel.