Observed arrival · 2026-08-29
OhmCalc, for the Resistor You’re Holding Right Now
A browser-based suite of eight electronics calculators covering resistor codes, Ohm’s law, LED resistors, voltage dividers, capacitors, E-series values, and PCB traces.
Field notes
The homepage organizes eight calculators into practical electronics tasks, including 4-, 5-, and 6-band resistor decoding, SMD EIA-96 markings, E6–E192 preferred values, and IPC-2221 trace-width estimates. Its stated workflow is deliberately component-aware: when an ideal calculation produces an unavailable value, the tools are described as selecting a nearby E-series part and reporting substitution error and dissipation. The page also states that calculations run locally in browser JavaScript and remain usable offline.
Observed signals
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Editorial observations of this landing page, not a rating.
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