Observed arrival · 2026-08-30
スーパー電卓: the calculator for everything you almost calculated
A free Japanese suite of 64 calculators for shopping, cooking, unit conversion, household costs, DIY, and shipping.
Field notes
The suite is divided into six practical areas, with individual calculators linked for tasks ranging from 100-gram price comparisons to recipe scaling and electricity estimates. Its narrower tools include toilet paper priced per metre, tissue priced per sheet, detergent cost per use, coffee cost per cup, and material estimates for tiles, wallpaper, paint, and artificial turf. Results are explicitly described as reference values, so the calculations function as everyday planning aids rather than authoritative quotes.
Observed signals
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Editorial observations of this landing page, not a rating.
One card from the complete issue