Observed arrival · 2026-10-08

設備計算ノート: Ten Building-Services Calculators

setsubi-keisan.com Visit website

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

A Japanese-language collection of free browser calculators for electrical, water-supply, drainage, and septic-system work.

Landing page captured for the 2026-10-08 issue.

For: Japanese electrical and plumbing design practitioners
Worth noticing: The homepage names Weston, Hazen–Williams, Manning, JEAC 8001-2022, and JIS A 3302-2000 among its calculation references.

Field notes

The listed tools include circuit-specific voltage-drop calculations, wire-current adjustments for conduit fill and ambient temperature, and pump estimates that combine lift, pipe friction, terminal pressure, and velocity head. The homepage cites technical references and warns that results are estimates, advising users to check original standards and the relevant authority for design or applications.

Observed signals

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Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

$PaidCommerce or pricing visible

●ProPolished or operationally mature

◎NicheUnusually specific use

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