MAP
Maps and navigation
Google Maps, train routes, restaurant searches, and directions.
Navigation throughout the day
Free mobile-data calculator
How much data do you need in Japan?
Enter your trip length and normal internet habits. The calculator estimates your total usage and recommends a practical data-plan size with a safety margin.
No sign-upInstant estimateAdjustable usage
Trip details
Build your estimate
Daily usage
Choose your normal level
MSG
Messages and email
LINE, WhatsApp, Messenger, email, and ordinary web browsing.
Frequent messaging and browsing
SNS
Social media
Instagram, TikTok, X, Facebook, Threads, and photo uploads.
Browsing feeds and posting daily
VID
Streaming video
YouTube, Netflix, live streams, and entertainment video.
Around 15 minutes per day
CALL
Video calls
FaceTime, Zoom, Google Meet, Teams, and WhatsApp calls.
No video calls using mobile data
PC
Laptop and hotspot use
Tethering, remote work, cloud documents, and laptop browsing.
Phone use only
Understanding your result
Why actual data use can vary
Mobile-data consumption depends on video quality, automatic downloads, cloud backups, app updates, hotspot use, and how often hotel or public Wi-Fi is available.
Maps use relatively little data
Navigation is rarely the biggest problem. Video, cloud uploads, and tethering usually consume much more.
Video quality changes everything
High-definition streaming can use several times more data than standard-definition viewing.
Groups need separate planning
Individual eSIM users need their own plans, while pocket Wi-Fi data is shared by connected devices.
A safety margin prevents stress
The calculator adds extra capacity because real travel use is rarely identical every day.
Important:
This is an estimate rather than a guarantee. Provider definitions of unlimited data, high-speed data, throttling, tethering, and fair-use limits differ. Check the current plan conditions before purchasing.