Data math

How Much Data Do You Need in Japan?

A Japan day is maps, trains, translate and photos, and each has a known appetite. Add yours up and the right plan falls out.

What each app really uses

Maps and transit: tens of megabytes a day. Camera translate: light. Chat: nothing until someone sends video. Social scrolling: about 1GB per video-heavy hour. Streaming and video calls: about 1GB per HD hour. Photo backup: set it to Wi-Fi only before you fly.

Profile one: the classic tourist

1 to 1.5GB a day in practice. A week fits inside 10GB for a week at $12.44, the live catalog checked October 22, 2026, with margin. 5GB for a week at $9.33 covers the disciplined version.

Profile two: the creator

2 to 4GB a day, driven by uploads. 20GB across 15 days at $21.84 fits a two-week shoot. Sustained big uploads will feel the unlimited plan's 10 Mbps cap; read the fair use page first.

Profile three: the long stay

Wi-Fi carries the heavy hours; mobile data is the glue. 10GB across 30 days at $14.55 is the workhorse. 20GB across 30 days at $22.89 adds hotspot afternoons and video calls from the park.

Running low mid-trip

Fixed plans drop to 384 kbps when the bucket empties, enough to message and decide. Most of our eSIMs do not top up: more data means a fresh eSIM, installed in the same two minutes.

Straight answers

Is 5GB enough for a week in Japan?

For maps, trains, translate and chat with photos saved to Wi-Fi, yes for most people. Add daily social video posting and it gets tight; 10GB removes the worry for a small step up.

Is 10GB enough for two weeks in Japan?

For a light user leaning on hotel Wi-Fi, often yes. Our 10GB bucket also comes in a 30 day validity, so the days are not the constraint; the video habit is.

Can I top up my Japan eSIM when data runs out?

Most of our Japan eSIMs do not recharge. Buying more data means a new eSIM, installed in about two minutes, and your number and home line are unaffected.