Skip to content
FREE · OPEN SOURCE · 297+ TOOLS

Free Online Electronics Calculators

200+ professional-grade tools for engineers and students. Resistor codes, PCB design, RF tools, circuit diagrams and more.

Browse All Categories Popular Tools
297+
Free Tools
16
Categories
0
Sign-ups Required
100%
Mobile Friendly

Browse by Category

Choose from 16 specialized categories

All Calculators

All Calculators

Browse all 297+ electronics calculators and tools in one place.

297+ tools
Digital Components Calculators

Digital Components Calculators

555 timers, logic gates, bitwise simulators and digital circuit tools for electronics engineers.

11 tools
General Components Calculators

General Components Calculators

Unit converters, transformer calculators, temperature tools and general electronics utilities.

15 tools
Cable & Connector Calculators

Cable & Connector Calculators

Wire inductance, impedance, cable sizing, voltage drop and connector calculators.

12 tools
PCB & Track Calculation

PCB & Track Calculation

Trace resistance, impedance, crosstalk, stripline and microstrip PCB design calculators.

20 tools
Power Calculations

Power Calculations

Battery life, voltage regulators, RMS, snubber, flyback and power supply design tools.

16 tools
Radio Frequency Calculators

Radio Frequency Calculators

RF attenuators, antenna, radar, waveguide, VSWR and transmission line calculators.

44 tools
Colour Code Calculators

Colour Code Calculators

Resistor, capacitor, inductor, diode, SMD and fuse color code decoders.

16 tools
Pinouts - Connectors

Pinouts - Connectors

Audio, video, PC, car and registered jack connector pinout reference diagrams.

6 tools
Pinouts - IoT Boards

Pinouts - IoT Boards

Arduino, Raspberry Pi, BeagleBone, ESP and IoT development board pinout diagrams.

18 tools
Daily Use Calculators

Daily Use Calculators

Most frequently used everyday electronics calculators — all in one place.

11 tools
Resources

Resources

Reference tables, charts, symbol guides, wire tables and electronics databases.

26 tools
Active Components Calculators

Active Components Calculators

FET buffer, transistor switch, tunnel diode and varactor diode calculators.

4 tools
Passive Components Calculators

Passive Components Calculators

Resistor, capacitor, inductor, impedance, coil and thermistor calculators.

23 tools
Analog Components Calculators

Analog Components Calculators

Op-amp, BJT, amplifier, impedance matching, filter and reactance calculators.

19 tools
Circuit Diagrams

Circuit Diagrams

555 timer circuits, alarms, sensors, motor controllers, LED projects and more.

45 tools
Electronics Packages

Electronics Packages

IC package types — QFP, BGA, DIP, SMD footprints and component package references.

11 tools

Latest Articles

Electronics tutorials, guides & tips

View All Articles

Trending Tools

What engineers are using right now

Why ElectroJeni?

Built for professionals, free for everyone

Accurate & Verified

All formulas verified against IEEE and IEC standards for professional use.

Mobile First

Responsive design that works perfectly on phones, tablets, and desktops.

Instant Results

All calculations run in your browser. No loading, no server round-trips.

No Sign-up

Unlimited free access. No accounts, no paywalls, no restrictions.