Question 1

Are these electronics calculators free?

Accepted Answer

Yes. Every calculator here is completely free, needs no sign-up and has no usage limits. They are funded by unobtrusive ads and run entirely in your browser.

Question 2

Are the formulas accurate?

Accepted Answer

Each tool uses the standard textbook formula for its quantity, and many follow published standards such as IPC-2221 for PCB trace width or IEC 60063 for the E-series. Results are for engineering estimation; always confirm safety-critical designs against the relevant datasheet and standard.

Question 3

What can I calculate here?

Accepted Answer

Ohm's law and power, voltage dividers, series/parallel resistors, LED series resistors, RC and LC filter cutoff, 555 timer frequency and duty, impedance and resonance, RMS/peak conversion, op-amp gain, decibels, ADC resolution, wire voltage drop and PCB trace width.

Question 4

Do they work on a phone?

Accepted Answer

Yes. The calculators are mobile-friendly and run client-side, so they work on phones and tablets in any modern browser.

Question 5

Is anything uploaded to a server?

Accepted Answer

No. All calculations happen locally in your browser; nothing you enter is sent anywhere.

Electronics Calculators