Electronics Engineering Platform

Build. Calculate. Engineer.

Free practical electronics engineering calculators for circuit design, components, RF, power electronics, batteries, signal analysis and electrical engineering.

OCTOPART
ENGINEERING
Engineering Platform

Tools for Modern Electronics

Explore calculators covering fundamental circuits, passive components, RF and signal analysis, batteries, electrical units and practical hardware engineering.

Circuit & Analog

Calculators for voltage, current, resistance, power, dividers, time constants and resonance.

Components

Practical calculators for resistors, capacitors and inductors used in everyday circuit design.

RF & Signal Analysis

Calculators for wavelength, frequency, antennas, dB, dBm and signal relationships.

Power Electronics

Tools for electrical power, batteries, stored energy and practical power-system calculations.

Frequency & Timing

Convert frequency and period and work with timing relationships used in digital and analog electronics.

Electrical Units

Convert common electrical engineering units and signal levels quickly without leaving the Octopart platform.

Electronics Calculators

Engineering Calculator Directory

Browse the available Octopart.org calculators. Each tool provides the relevant formula, inputs, worked examples and practical engineering notes.

Use these tools for quick engineering calculations during circuit design, component selection, prototyping, RF work, power-system analysis and electronics development.

Circuit Calculators

Fundamental voltage, current, resistance, power and circuit relationships.

Ohm's Law Calculator

Calculate voltage, current, resistance and power using Ohm's law.

Open Calculator

Voltage Divider Calculator

Calculate divider output voltage, current and resistor power.

Open Calculator

Current Divider Calculator

Calculate current distribution through parallel resistor branches.

Open Calculator

Power Dissipation Calculator

Calculate electrical power from voltage, current and resistance.

Open Calculator

RC / RL / RLC Time Constant

Calculate RC and RL time constants and related circuit timing values.

Open Calculator

Resonance Frequency Calculator

Calculate LC and RLC resonant frequency from inductance and capacitance.

Open Calculator

Resistor, Capacitor & Inductor Calculators

Component values, combinations, stored energy and electrical characteristics.

SMD Resistor Code Calculator

Decode 3-digit, 4-digit, R-marked and EIA-96 SMD resistor markings.

Open Calculator

Resistor Color Code Calculator

Decode resistor values from common color-band markings.

Open Calculator

Series Resistor Calculator

Calculate total resistance, circuit current, voltage drops and power for series resistors.

Open Calculator

Parallel Resistor Calculator

Calculate equivalent resistance for parallel resistor networks.

Open Calculator

Capacitor Reactance Calculator

Calculate capacitive reactance from frequency and capacitance.

Open Calculator

Inductor Reactance Calculator

Calculate inductive reactance from frequency and inductance.

Open Calculator

Series Capacitor Calculator

Calculate equivalent capacitance, charge and voltage distribution.

Open Calculator

Parallel Capacitor Calculator

Calculate total capacitance for parallel capacitor networks.

Open Calculator

Capacitor Energy Calculator

Calculate energy stored in a capacitor using E = ½CV².

Open Calculator

Inductor Energy Calculator

Calculate energy stored in an inductor using E = ½LI².

Open Calculator

RF, Signal & Frequency Calculators

Tools for frequency, wavelength, antennas, signal levels and RF engineering.

Frequency ↔ Wavelength

Convert frequency to wavelength and wavelength to frequency.

Open Calculator

Antenna Length Calculator

Estimate quarter-wave and other antenna lengths from operating frequency.

Open Calculator

dB Calculator

Calculate power, voltage and current ratios in decibels.

Open Calculator

Voltage ↔ dB Calculator

Convert voltage ratios to dB and dB values back to voltage ratios.

Open Calculator

dBm ↔ Watts Calculator

Convert RF power levels between dBm, watts, milliwatts and microwatts.

Open Calculator

Frequency ↔ Period

Convert frequency to period and period to frequency across common units.

Open Calculator

Power & Battery Calculators

Practical tools for electrical power, battery capacity and stored energy.

Power Dissipation

Calculate power using voltage, current or resistance.

Open Calculator

Battery Runtime Calculator

Estimate battery runtime from capacity, voltage, load and efficiency.

Open Calculator

Capacitor Energy

Calculate stored energy from capacitance and voltage.

Open Calculator

Inductor Energy

Calculate magnetic energy stored in an inductor from L and current.

Open Calculator

Electrical Unit Converters

Convert electrical engineering quantities and signal-related units.

Electrical Unit Converter

Convert common electrical units including voltage, current, resistance, capacitance, inductance, frequency and power.

Open Converter

Frequency ↔ Period

Convert Hz, kHz, MHz and GHz into corresponding time periods.

Open Converter

Frequency ↔ Wavelength

Convert between frequency and wavelength for RF, optical and acoustic applications.

Open Converter

dBm ↔ Watts

Convert absolute RF power levels between dBm and watts or milliwatts.

Open Converter
Octopart Development

Engineering Tool Roadmap

The calculator library will continue expanding into PCB engineering, embedded systems, power electronics, RF and hardware manufacturing.

1

Fundamental Electronics

Ohm's law, voltage and current dividers, resistance, power, capacitors, inductors, RC circuits and resonance.

2

Component Engineering

Resistor color codes, SMD markings, capacitor codes, component combinations, energy storage and practical component calculations.

3

RF & Signal Engineering

Wavelength, antennas, dB, dBm, attenuation, signal ratios, RF systems and transmission-line calculations.

4

PCB & Power Electronics

Trace width, via current, impedance, PCB stackups, converters, batteries, thermal calculations and power-system tools.

5

Embedded Systems & Manufacturing

Future tools can include UART, SPI, I²C, PWM, clocks, BOM analysis, PCB manufacturing, assembly and hardware production utilities.

An Electronics Toolbox for Engineers

Octopart.org brings practical electronics calculations and engineering utilities into one accessible platform. The calculator library covers circuit design, passive components, RF and signal analysis, power electronics, batteries and electrical unit conversion.

New engineering tools can be added progressively, with an emphasis on clear formulas, useful examples, responsive interfaces and practical engineering notes.

Latest Electronics News 2026 | Engineering, Tech & Hardware Updates

Latest Electronics News & Engineering Articles

Stay updated with the newest trends in electronics, hardware, and embedded systems.

EE Times News

Nova Scotia Bets on Microelectronics Integration, Not Chip Fabs

Atlantic Canada’s coastal engineering cluster is turning specialized components and rugged hardware into exportable tools for subsea research, security, and resource markets.

The post Nova Scotia Bets on Microelectronics Integration, Not Chip Fabs appeared first on EE Times.

NewSpace-Grade NOR Flash: Right-Sized Reliability for Space Missions

This paper first examines how total ionizing dose and single-event effects degrade NOR Flash. It focuses on the charge pumps, sense amplifiers, and control logic that often fail before the storage array does. It then presents a method for deriving radiation requirements from four mission inputs (orbit, lifetime, shielding, and risk tolerance) instead of applying […]

The post NewSpace-Grade NOR Flash: Right-Sized Reliability for Space Missions appeared first on EE Times.

electronica 2026: Chipmakers Move Up the Stack as Data Centers and Physical AI Take Center Stage

Explore how electronica 2026 shows chipmakers shifting to AI platforms as data centers, edge AI, and robotics reshape power and silicon.

The post electronica 2026: Chipmakers Move Up the Stack as Data Centers and Physical AI Take Center Stage appeared first on EE Times.

How NovoGenius® MCU+ Devices Are Reshaping the Automotive Edge Node 

NOVOSENSE NovoGenius MCU+ chips integrate analog, power, and drivers, adding intelligence to automotive edge nodes for motor control, sensing and lighting.

The post How NovoGenius® MCU+ Devices Are Reshaping the Automotive Edge Node  appeared first on EE Times.

Jensen Resigns Over Second Affair

Nvidia CEO’s second affair scandal in a week prompted his resignation, and the board is now searching for a new leader for the company.

The post Jensen Resigns Over Second Affair appeared first on EE Times.

Hackaday News

Loop Antennas for Transmitting

Loop antennas are becoming increasingly popular as more radio fans find they can’t erect elaborate outdoor antennas. Like most things, of course, there are trade-offs. But, most often, loop antennas …read more

An Orbital Sanders Crash Course and the Threat of HAVS

Most people know about orbital sanders, as the cousin of sheet sanders, with many people using them every day to make wood and other surfaces smooth. Yet if you have …read more

Printing Smooth Upper Surfaces with a Non-Planar Slicer

One of the most tantalizing prospects for 3D printing has been non-planar printing, which promises smoother surfaces without a staircase pattern, reduced or eliminated support structures in some incarnations, and …read more

An MP3 Player, Implemented As A Factorio Blueprint

Factorio is a factory simulation game that leads its players into many happy hours of building ever more complex factories, but it comes with a snag. Its built-in music is …read more

Reverse Engineer that USB Device in Style

Proprietary device drivers, dedicated applications, and their ilk are the bane of the open-source hacker. If only we could snoop on every device out there, recording the “secret” USB transactions …read more

Adafruit Blog News

Adafruit Weekly Editorial Round-Up: CircuitPython, LED Spirit Board & More!

ADAFRUIT WEEKLY EDITORIAL ROUND-UP We’ve got so much happening here at Adafruit that it’s not always easy to keep up! Don’t fret, we’ve got you covered. Each week we’ll be posting a handy round-up of what we’ve been up to, ranging from learn guides to blog articles, videos, and more. BLOG ⌨️ CircuitPython 11.0.0-alpha.3 Released! […]

WM 0.10 is a window manager for DOS XT and 286

theelf has posted WM 0.10 on the VCF Forums, a window manager for DOS that’s been years of personal work. It runs on a 286 with a VGA card at 640×480 in 16 colors. It also runs on an XT, though that part isn’t fully tested, since the development machine is a Harris 286-25. Memory […]

Underwater internet cables can help save endangered whales

Andrew Paul, writing for Popular Science, covers work by Cornell University bioacoustics researcher Léa Bouffaut that turns deep sea fiber-optic cables into microphones for listening to whales. The method is called distributed acoustic sensing, or DAS. Laser pulses are sent down a telecom cable, and the returning light is checked for tiny changes caused by […]

Stenberg: 30 years of Internet transfers with curl

corbet at LWN points to Daniel Stenberg’s post marking 30 years of the curl project. curl is the command line tool for transferring data with URLs, and libcurl is the library version that other software builds on. Stenberg puts libcurl at an estimated thirty billion installations. He’s clear that the figure is rough. Most projects […]

My $300 embroidery machine needed a subscription, so I built my own app

Kathy Korevec built ZigZag, a free, open-source embroidery editor for Mac and Windows, after finding that her $300 Brother Skitch (PP1) machine wanted a subscription. It’s written in Rust and turns SVG artwork into stitches, then exports PES, DST, EXP, JEF or VP3 for most embroidery machines. Designs can also be sent straight to the […]

Electronics Weekly News

Picture of the Day: Lemo drives Sauber F1 to Electronica

One of the visual highlights of the Messe Munchen during Electronica was the Lemo stand, featuring the red and white, and black, Alfa Romeo F1 race car.

The post Picture of the Day: Lemo drives Sauber F1 to Electronica appeared first on Electronics Weekly.

Jedec creates Subcommittee to address System Level Reliability Testing

Jedec is inviting industry participation in the creation of a Subcommittee on System Level Reliability Testing (SLRT). The microelectronics standards body, to be precise is creating the Subcommittee JC-14.8. This […]

The post Jedec creates Subcommittee to address System Level Reliability Testing appeared first on Electronics Weekly.

Technologies Which Died

30 years ago the world was debating the claims of WiMAX and HSDPA to be the future. ‘There was dissension in the ranks over the forthcoming mobile variant of the […]

The post Technologies Which Died appeared first on Electronics Weekly.

Electronica: Renesas adds Xplorer Developer Hub

Inexpensive RA MCU board, expansion modules, application software and development tools are available via Xplorer Developer Hub Integrated with Renesas 365, the company’s electronics system development platform. Renesas launched the […]

The post Electronica: Renesas adds Xplorer Developer Hub appeared first on Electronics Weekly.

Electronica – The latest news roundup

Don’t miss the Electronics Weekly roundup of all our latest news from Electronica, the bi-annual event running from 10-13 November in Munich. Electronica is the world’s biggest electronics show, and Electronics […]

The post Electronica – The latest news roundup appeared first on Electronics Weekly.

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