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

IBM, AMD Mix Quantum and AI at U.S. National Lab

IBM, AMD, and Oak Ridge launch hybrid quantum-classical system to accelerate quantum-error correction research ahead of 2028.

The post IBM, AMD Mix Quantum and AI at U.S. National Lab appeared first on EE Times.

Europe’s Chip Industry: Perfect Storm or Perfect Timing?

At SEMICON Europa 2026, Europe’s chip industry will confront a “perfect storm” of geopolitical, technological, and competitive pressures.

The post Europe’s Chip Industry: Perfect Storm or Perfect Timing? appeared first on EE Times.

EE Times Magazine – November 2026

This edition of EE Times Magazine explores advances in semiconductor manufacturing and packaging, farm autonomy, and Canada’s efforts to commercialize emerging technologies.

The post EE Times Magazine – November 2026 appeared first on EE Times.

Infineon Leaders Andreas Urschitz and Maher Matta on a Decade of OktoberTech

Sponsored: Infineon’s Andreas Urschitz and Maher Matta talk to EE Times at OktoberTech Silicon Valley 2026, looking back on a decade of innovation and growth.

The post Infineon Leaders Andreas Urschitz and Maher Matta on a Decade of OktoberTech appeared first on EE Times.

Infineon’s Johannes Schoiswohl on the GaN Market at OktoberTech

Sponsored: PEN’s Aalyia Shaukat talks to Infineon’s Johannes Schoiswohl about the GaN market at OktoberTech Silicon Valley 2026, the event’s 10th anniversary.

The post Infineon’s Johannes Schoiswohl on the GaN Market at OktoberTech appeared first on EE Times.

Hackaday News

The Goat Emoji Is 100% Valid Machine Code, and It Doesn’t Stop There

Did you know emojis can be executables? Well, they are if you treat them like Intel 8088 or 8086 machine code, anyway. [GloriousCow] shared this clever revelation, demonstrating that executable …read more

Making Xibalba 64, a New N64 Release in 2026

[Dominic Szablewski] created something that we don’t see every day: a no-kidding new physical Nintendo 64 game for sale, complete with cartridge, manual, and box art. He wrote about what …read more

Translating An Old Display To A New One

A quick search through AliExpress will find PCBs that take HDMI or VGA and translate them to DSI lanes for TFT panels, and even boards that translate DSI to HDMI …read more

Reviving Google Cardboard, Without Google or Cardboard

Remember Google Cardboard? The late, unlamented practice of strapping a phone to your face so you could get motion sickness in a virtual environment? [brenpoly] wants you to reconsider, because …read more

Stunning Volumetric 3D Display Goes For a Spin

[AncientJames] gives us a detailed look at Vortex, one of his impressive volumetric displays made with two back-to-back LED panels that spin at high speed with a Raspberry Pi 4 …read more

Adafruit Blog News

There are now 600 CircuitPython Libraries! #CircuitPython

The CircuitPython community reached a big milestone together today! There are 600 CircuitPython Libraries! The CircuitPython Library Bundle and Community Library Bundle contain all the current libraries available for CircuitPython. CircuitPython libraries are separate files designed to work with CircuitPython code. CircuitPython programs require a lot of information to run. CircuitPython is so simple to […]

Get Ready to Welcome Seasonal Guests with Help from the Adafruit Learning System

Add personal touches to the holiday season with help from the Adafruit Learning System! Chilled Drinkibot Make a nice, cold beverage using thermoelectric cooling! CircuitPython BLE Multi-Temperature Monitoring Monitor your cooking temperatures over Bluetooth Adafruit MagTag Kitchen Timer Build a handy kitchen timer with the Adafruit MagTag Thanksgiving Robotic Turkey Hand with Circuit Playground Express […]

NEW PRODUCT – Adafruit RV-8803 High Accuracy Real Time Clock Breakout Board – STEMMA QT / Qwiic

NEW PRODUCT – Adafruit RV-8803 High Accuracy Real Time Clock Breakout Board – STEMMA QT / Qwiic __________________________________________________________________________________________________ For excellent accuracy time-keeping – when your everyday RTC (Real Time Clock) won’t do – the Adafruit RV-8803 Precision Real Time Clock Breakout Board is a tick-tock above the rest with excellent ±1.5 ppm (at 0~50°C) accuracy. Thanks to the […]

Boosting 3V to 1800V without chips

electroniclovers has posted a breakdown on Hackster.io of how an electric fly swatter turns two AA batteries into an 1,800V zap, without a microcontroller or a driver chip. The first stage is a self-oscillating transistor circuit. A transformer has three windings: an 8-turn primary, a 1,200-turn secondary, and a feedback winding. Current through the primary […]

Man builds robotic cat feeder that senses when dish is empty #PiDay @Raspberry_Pi

Andrew Paul writing for Popular Science covers a cat feeder built by Jason Winfield, a YouTuber in New Zealand who travels often. Most store-bought feeders dump a premeasured scoop on a timer. Winfield wanted one that also knows whether the food got eaten. The build runs on a Raspberry Pi Pico with WiFi, plus a […]

Electronics Weekly News

What caught your eye? AI bust, Qualcomm MMIOs, RF emitters

What caught our eye this last week? There's the AI bust, Qualcomm supplying Starlink Mobile’s 5G radio equipment, and identifying hostile RF emitters in battlefield conditions...

The post What caught your eye? AI bust, Qualcomm MMIOs, RF emitters appeared first on Electronics Weekly.

Partying like it’s 1999 with the hangover in 2001

Partying like it’s 1999 without knowing that 2001 would see a 32% fall in the semi market, a chip analyst spun a rosy yarn A 1999 EW story started: ’The […]

The post Partying like it’s 1999 with the hangover in 2001 appeared first on Electronics Weekly.

Emerson NI PXIe instruments for AI-accelerated automated testing

Emerson has announced new NI PXI express instruments featuring an AI-accelerated approach to automated test. The goal, says the company, is to make the testing process more accessible to engineering […]

The post Emerson NI PXIe instruments for AI-accelerated automated testing appeared first on Electronics Weekly.

MDA Space to provide digital antenna subsystems for IRIS² satellites

Canadian space company MDA Space has won a contract from Thales Alenia Space for work on the development of Europe’s IRIS² satellites. Specifically it will begin work on MDA AURORA […]

The post MDA Space to provide digital antenna subsystems for IRIS² satellites appeared first on Electronics Weekly.

Most Read – ASML exec pay, Toyota robotaxis, In-car computing

Looking at the news stories written within the last week, the most popular articles on the site cover Greece unveiling its semiconductor strategy, ASML links exec pay to employee morale, and Toyota and Waymo planning to launch robotaxis in Japan.

The post Most Read – ASML exec pay, Toyota robotaxis, In-car computing appeared first on Electronics Weekly.

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