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

CASPA CEO Summit Preview with President Jimmy Cheng

CASPA’s annual conference celebrates its 35th anniversary with a lineup of more than 35 CEOs from Silicon Valley, including Intel’s Lip-Bu Tan and Cerebras’s Andrew Feldman.

The post CASPA CEO Summit Preview with President Jimmy Cheng appeared first on EE Times.

17 Years with China: What Really Makes a Partnership Work

Honya Europe's Robert Tarantowicz shares 17 years of lessons on PCB sourcing in China, quality, trust, and risk management.

The post 17 Years with China: What Really Makes a Partnership Work appeared first on EE Times.

Europe’s Advanced Packaging Gap: Fraunhofer, Swissbit Target the Missing Middle

Low-volume production sits between research and mass manufacturing. Europe needs an industrial model to fill the gap.

The post Europe’s Advanced Packaging Gap: Fraunhofer, Swissbit Target the Missing Middle appeared first on EE Times.

Applied Materials Bets $5B on a New Model for Chip Innovation

Applied Materials’ $5 billion EPIC Center brings chipmakers, equipment suppliers, and researchers together to accelerate semiconductor R&D and commercialization.

The post Applied Materials Bets $5B on a New Model for Chip Innovation appeared first on EE Times.

Embedded Graphics on an MCU – Without an Accelerator

Join this webinar and learn how to add LCD graphics to MCU projects without a display controller, accelerator, or external DRAM.

The post Embedded Graphics on an MCU – Without an Accelerator appeared first on EE Times.

Hackaday News

ESP-SDR Can Now Transmit

Well, that was fast! Last week, we reported on two apparently simultaneous hacks using the 2.4 GHz radio inside many ESP32 variants that enabled raw access to the radio samples, …read more

Using a Waffle to Check the Health of your Wii U’s NAND Flash

Game consoles tend to have a weak spot or two that will take certain units out sooner than they would due to normal parts aging. In the case of the …read more

Counting the PET Bottles Needed to Make 1 Kg of Printer Filament

In countries where PET bottles do not get slapped with an additional fee that induces you to return it for recycling and said fee back, the resulting piles of discarded …read more

The FPGA Chronicles: Ready to Probe

In the last few installments, we looked at using the Tang Nano 20K with both the GOWIN tools and some open-source tools. The open-source tools certainly had the advantage of …read more

A Modern Browser for the PlayStation Portable

The Sony PlayStation Portable, better known as the PSP, is now over two decades old. In its day it was an impressive handheld gaming machine, not least because of the …read more

Adafruit Blog News

Bonnie J. Dunbar #ALD26 @findingada

Bonnie Jeanne Dunbar is an American engineer and retired NASA astronaut who flew on five Space Shuttle missions between 1985 and 1998. University of Washington Magazine shared her story. It was only fitting that Dunbar flew on the space shuttle. As an undergraduate at the UW, she helped Ceramic Engineering Professor James I. Mueller develop […]

Yamin Zhang #ALD26 @findingada

  image via yaminzhang.group   Dr. Yamin Zhang has invented a sesame seed sized wireless pacemaker that is both an electrical stimulator and a battery: Its electrodes, made from bioabsorbable metals like molybdenum, magnesium, and/or zinc, pass current through the heart’s own fluids, which serve as the battery’s electrolyte. The pacemaker, roughly the size of […]

Mini Retro TV: a tiny video player with ESP32-S3

Tech Talkies built a small video player around an ESP32-S3 and posted the build on Hackster.io. The board is a MaTouch Lite ESP32-S3 with a 2.4 inch ST7789 SPI IPS touchscreen, dressed up as a miniature television. Decoding H.264 on a microcontroller is not practical, so the project sidesteps the problem. A video is converted […]

JP’s Product Pick of the Week — 3pm Eastern TODAY 10/13/26 @adafruit #adafruit #newproductpick

Come on by for JP’s Product Pick of The Week ! A new product pick will be revealed. The show airs at 3pm ET / 12pm PT Check out the livestream right here inside this product page you won’t want to miss it because there will be a LARGE DISCOUNT during the show! Tune in […]

OpenClaw for ESP32 – meet WireClaw!

cgwaltney Christopher posted a video on the Seeed Studio Forum introducing WireClaw, a port of OpenClaw for the ESP32. The thread sits in the forum’s General Info and Guidance category, and the post itself is the video. In a follow-up message, the same poster reports getting stuck while working through the tutorial. Asking the chat […]

Electronics Weekly News

10 years of TME Education – a decade of supporting technical education

Learn more about TME Education – an educational project based on practical learning and collaboration with local communities.

The post 10 years of TME Education – a decade of supporting technical education appeared first on Electronics Weekly.

Pathways into Electronics reports on women’s route to study electronics

The UK Electronics Skills Foundation’s (UKESF) new report examines the routes women take to study electronics in further education: Pathways into Electronics: Women EEE Students. It shares findings into the […]

The post Pathways into Electronics reports on women’s route to study electronics appeared first on Electronics Weekly.

How Can Users Who Seek Mental Health Support From AI Be Protected?

As more and more people lean on chatbots for comfort and guidance, experts have raised alarms over the potential pitfalls: erosion of social skills, unhealthy attachment to digital companions offering […]

The post How Can Users Who Seek Mental Health Support From AI Be Protected? appeared first on Electronics Weekly.

Linking functional safety with cybersecurity in the automotive industry

Adding cybersecurity to a car alongside existing protection against technical failures may disrupt critical reaction times for preventing an accident. Engineers can balance this through combined risk analysis, writes Diego […]

The post Linking functional safety with cybersecurity in the automotive industry appeared first on Electronics Weekly.

Knowles ATT A-Series of attenuators in compact SMT package

Knowles is introducing its ATT A-Series of wideband, surface mount attenuators, broadening its high-performance RF component portfolio. The company highlights the series’ attenuation accuracy and high power handling in a compact […]

The post Knowles ATT A-Series of attenuators in compact SMT package appeared first on Electronics Weekly.

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