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

U.S. Manufacturing Activity Gains Momentum in October

Economic activity in the U.S. manufacturing sector expanded in October driven by accelerating production and steady gains in new orders.

The post U.S. Manufacturing Activity Gains Momentum in October appeared first on EE Times.

Accepting Orders for the LED Light-Sourced Projection Aligners

Ushio has been accepting orders for LED-based UX-4 wafer aligners since July 2026, offering mercury-free, high-throughput lithography.

The post Accepting Orders for the LED Light-Sourced Projection Aligners appeared first on EE Times.

Bringing Design Data Management into the Developer Workflow

As digital design workflows increasingly center on modern, text-based development environments, engineers expect the same efficiency from design data management as they do from coding tools. Visual Studio Code (VS Code) has become a preferred platform for developing RTL, HDL, scripts, and verification assets, offering a flexible and extensible workspace that streamlines day-to-day engineering tasks. […]

The post Bringing Design Data Management into the Developer Workflow appeared first on EE Times.

AI Hardware’s Hidden Cost: Between Orders and Output

Alphabet’s TPU inventory, Intel’s manufacturing tradeoffs, and equipment suppliers’ balance sheets show how capital builds up along the path to usable AI computing capacity.

The post AI Hardware’s Hidden Cost: Between Orders and Output appeared first on EE Times.

Five Things You Didn’t Know About Co-Packaged Optics 

CPO may be a photonics breakthrough, but commercial success hinges equally on advanced packaging that integrates, connects and protects components at scale.

The post Five Things You Didn’t Know About Co-Packaged Optics  appeared first on EE Times.

Hackaday News

Toddler Phone Calls Family and No One Else

The great thing about the modern world is how connected we are. It’s also the worst thing about the modern world, to be honest. [Allan Binder] wanted to give his …read more

Detecting an Eight Magnetic Pole State using Chiral Phonons

The idea that magnetism doesn’t necessarily always have a dipolar configuration is not a new one, but it’s not an easy theory to find evidence for. Most recently a team …read more

2026 Hackaday Supercon: Bruce Potter’s Keynote Explores the Hacker Mind

What is hacking? Many, especially in the mainstream, view it through the lens of computer security. Others consider it synonymous with making or creating. Even for those of us immersed …read more

ToothPaste Goes Where Your Password Manager Doesn’t

One of the easiest ways of improving security and privacy when using the Internet, and computers in general, is to use strong passwords unique to each site or service. A …read more

The Depiction Of Amateur Radio In The Movies And TV

A constant in film and TV if you work with technology is to continually see wildly inappropriate depictions of it on screen. Whether it’s all those hacking scenes in which …read more

Adafruit Blog News

Claude’s new rules against game cloning won’t stop the AI copying boom

Kyle Orland, writing at Ars Technica, reports that Anthropic has added a rule to Claude Code’s system prompt to keep the model from re-creating specific existing video games. The rule, spotted in a json file named “tengu_heron_brook” around October 27, tells Claude to build original games, genre games and games from a user’s own designs […]

Self-Employed? Solopreneur? NIST has a cybersecurity guide just for you

NIST has released Small Business Cybersecurity: Non-Employer Firms, also known as NIST Cybersecurity White Paper 50. It’s written for the “solopreneur,” anyone who is the only paid employee of their business. More than 28 million small businesses in the U.S. fit that description. The guide assumes the reader doesn’t know anything about cybersecurity or the […]

Developing retro-GUIs for Win3.11 and OS/2

Chris, writing at chrisdevblog.com, built GUI apps for Windows 3.11 and OS/2 Warp 3 to control his microcontroller projects on real period hardware. He started with Borland Delphi 1 from 1995, the first and last Delphi that made 16-bit Windows programs. That worked right away, so he switched to Microsoft Visual C++ 1.52 from 1993, […]

Arkivism is a search and visual discovery engine for public domain works #ArtTuesday

Jason Kottke, writing at kottke.org, points to Arkivism, a search and visual discovery engine for public domain works. It pulls together millions of items that anyone can use. The collections come from the Smithsonian, The Met, NASA, the Library of Congress, the National Gallery of Art, the Rijksmuseum and others. Public domain means the copyright […]

GNUstep Desktop: a NeXT user interface for modern Linux

GNUstep Desktop (GSDE) is a Linux desktop environment that gives you a NeXT/OpenStep-like experience. It runs on the GNUstep framework, which is an open implementation of the OpenStep API in Objective-C, and pulls together apps and utilities the GNUstep community has written over the years. The code is compact enough that one person can follow […]

Electronics Weekly News

UK Space Agency invites proposals for international space partnerships

The UK Space Agency is inviting proposals for space-based projects that will help strengthen international partnerships for the UK space sector. Funding will be through the government’s International Bilateral Fund […]

The post UK Space Agency invites proposals for international space partnerships appeared first on Electronics Weekly.

Sony IMX742 1mm square image sensor serves single-use endoscopes

Sony has announced its IMX742, a CMOS image sensor for single-use endoscopes. The company highlights it as the industry’s first to support digital output and data transmission through a 5m […]

The post Sony IMX742 1mm square image sensor serves single-use endoscopes appeared first on Electronics Weekly.

Meta Dominates The Smart Specs Market

Meta’s new Audio AI glasses  started selling yesterday after the company’s Gen 3 smart glasses hit markets about three weeks ago. Most notably, the new audio-only model features the usual […]

The post Meta Dominates The Smart Specs Market appeared first on Electronics Weekly.

Bosch to spin off semis

Bosch will spin off its semiconductor division ‌in January 2028, it said today. The move comes as part of a strategy to run semis  as a foundry business as well […]

The post Bosch to spin off semis appeared first on Electronics Weekly.

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The post Get the Gadget Master newsletter! appeared first on Electronics Weekly.

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