Observed arrival · 2026-10-09
Ohmetry’s open-book engineering calculators
A free, browser-based set of 30 electrical, solar, EV, and protection calculators, with formulas, references, and worked examples.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Electrical, solar, EV, and protection practitioners
- Worth noticing
- The homepage divides its 30 calculators into three groups: 16 Electrical, 6 Solar and EV, and 8 Protection and MV.
Field notes
The homepage groups its tools into Electrical (16), Solar and EV (6), and Protection and MV (8), with a search field for finding a specific task. Its sample Ohm’s law panel updates the remaining values after any two are entered and includes a print-result button. The Solar and EV section says its assumptions are editable; the homepage also reports 201 automated tests.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue