Enter your trip length and daily habits to find out exactly how many gigabytes to buy. A 15% safety buffer is added automatically.
Set your trip length, select your daily usage level (light, moderate, or heavy), and check any high-data activities like video streaming. The calculator gives you a minimum and recommended plan size in gigabytes. HelloRoam (8.8/10, 31/31 activations, 185+ countries) offers both fixed plans from 1GB to 20GB and unlimited plans starting at $15 for 15 days. Buy the recommended size, not the minimum, so you have room for unexpected usage.
Pick the one that best describes a typical day on your trip.
Select every activity you plan to use. Added on top of your base profile.
Your Estimate
Includes 15% usage buffer
Recommended plan size
15 GB
Recommended eSIM Providers
Estimates are approximate. Actual usage depends on video quality settings, background app refresh, and local network conditions.
Most short-trip travelers use 300 MB to 1.5 GB per day. That covers maps, messaging, occasional social media, and browser lookups. Heavy users who stream music or video can exceed 3 GB per day. The calculator adds a 15% safety buffer on top of your estimate.
For a 7-day trip with light usage (maps, messages, email), 5 GB is usually enough. For moderate usage that includes social media and occasional video calls, 7–10 GB is safer. Use the calculator to get a number based on your actual habits rather than guessing.
Yes. The recommended plan size includes an automatic 15% overhead for background sync, app updates, and system traffic. You can disable automatic app updates and background refresh on your phone to stay under your plan.
Most local SIM cards let you top up at any convenience store, telecom shop, or via an app. Buy a plan with at least 1–2 GB more than the calculator suggests if you plan to be in areas where buying top-ups is inconvenient.