Tool
Estimate how quickly roaming costs can climb compared with a more controlled eSIM buying workflow. This is a planning tool, not a live carrier-price feed, so use it to frame the decision before purchase.
Trip length: 7 days
Estimated daily data use: 1.5 GB
Estimated comparison
Japan
Strong fit for short business trips and repeat reseller demand.
Estimated total data
10.5 GB
Estimated roaming spend
$116
Estimated eSIM spend
$37
Possible savings
$79
This estimate assumes a simple roaming-per-GB model versus a lower prepaid eSIM planning rate. Real market prices vary, but the calculator is useful for deciding whether a roaming-first workflow is likely to become expensive for this trip profile.