Observed arrival · 2026-09-14

買うまえ計算室: The Buy-Before Calculator Room

kaumae-keisan.com Observed source

Editorial interest 78/100 Selection signal · not a rating of the site

A Japanese set of free calculators for sizing monitors, estimating SSD capacity, and comparing electricity costs before buying.

Landing page captured for the 2026-09-14 issue.

Field notes

The project translates common specification questions into household constraints: whether two monitors fit on a 120cm desk, whether storage growth leaves enough free capacity, and how long an electricity-saving model takes to offset its higher purchase price. Its purchase guidance also separates USB-C connector shape from 5Gbps and 10Gbps speed ratings. The site states that its formulas and assumptions are public and that its material is based on manufacturer information and calculations, not hands-on reviews.

Observed signals

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Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

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