Estimates from the average rates shown next to each slider, plus a 10% buffer. Real use depends on app settings and quality.
The calculator multiplies hours per day by an average data rate for each activity. It then adds a 10 percent buffer.
How the estimate works
Each slider shows the rate it assumes, in MB per hour. Video at standard quality uses about 1 GB an hour. Maps and messages use very little.
Streaming quality changes the result most. Lower the video quality in the app, and the same hour uses far less data.
From GB to a plan
Round up to the next plan size, then pick a plan that lasts your whole trip. The plan length guide explains why validity matters as much as size.
If your daily use runs high, compare unlimited eSIM plans. Most of them slow down after a daily allowance.
Next step
Choose your destination above to open its plan finder with your numbers already set. For a quick pick, Yesim is our Editor's Choice. Our methodology shows how every provider is scored.
Frequently asked questions
How many GB do I need for a week abroad?
With maps, messaging and some browsing, a week often fits in 1 to 3 GB. Video and video calls push it far higher.
Is 5 GB enough for two weeks?
It is for light use: maps, messages, email and some social media. Daily video streaming will use it up in days.
When should I pick an unlimited plan?
Pick unlimited if you expect more than about 2 GB a day. Check the daily high-speed allowance first, since most plans slow down after it.
Does the calculator know my phone's real usage?
No. It uses the average rates shown next to each slider. Your phone settings show your own usage per app.
Editor's Choice is placed first; other rows follow the column shown. We earn a commission from some providers. Prices were checked on official sites and change often.
