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

SK Hynix Reports Record Q3 Results Driven by AI Memory Surge

Long-term customer contracts and rising chip prices point to a change in how memory manufacturers manage multi-year production capacity and capex.

The post SK Hynix Reports Record Q3 Results Driven by AI Memory Surge appeared first on EE Times.

Secure Safety and Security Communications

This whitepaper explores how building safety and security systems can overcome the limitations of legacy RS-485 networks by adopting Single Pair Ethernet (SPE). It examines the growing demands of AI-enabled surveillance, access control, cybersecurity, and system convergence, while highlighting how SPE delivers secure, scalable communications over existing infrastructure. Readers will learn about SPE architectures, migration […]

The post Secure Safety and Security Communications appeared first on EE Times.

Full-Stack Semiconductor Solutions for Embodied AI & Robotics

NSING Technologies, a Singapore-founded semiconductor company, presents this whitepaper on its full-stack semiconductor solutions for embodied AI and robotics, built around high-performance MCUs, security ICs, wireless connectivity and BMS ICs. The document explains the industry shift toward distributed robotic architectures that combine AI main control with deterministic real-time joint, motor and sensor nodes. It details […]

The post Full-Stack Semiconductor Solutions for Embodied AI & Robotics appeared first on EE Times.

Intel Wants a Quantum Business, Classiq Could Help Build One

After years of hardware research, Intel plans to acquire a software platform that connects quantum developers with enterprise users.

The post Intel Wants a Quantum Business, Classiq Could Help Build One appeared first on EE Times.

Transitioning Legacy Aircraft Power Architectures to High-Density Switching Supplies

High-density switching supplies help modernize legacy aircraft power systems while addressing obsolescence, efficiency, integration, and compliance challenges.

The post Transitioning Legacy Aircraft Power Architectures to High-Density Switching Supplies appeared first on EE Times.

Hackaday News

Turning an Old Phone’s Motherboard into an RC Plane Controller

Upcycling smartphones makes a lot of sense, especially since they contain so many components that remain useful long after their desirability as a smartphone has faded. In the case of …read more

JPEG-XL Is Back On The Menu

Many of the image formats we’re familiar with have been around for decades. We all know JPEG and PNG like the back of our hands, and GIF even had a …read more

Emulate the 486 in Your Browser

You might fondly remember the days of the Intel 486, but you probably don’t have one on your desk anymore. If you’d like to emulate that classic hardware, you can …read more

SLAM Navigation For an Arduino Powered Car

There are plenty of “robot” projects out there that are really just a small remote control platform of some sort. We often like to think of robots of having some …read more

Hacking a Marine Radio Dish

Having watched some fun videos on repurposed satellite dishes on YouTube, [Melan] wanted to get in on the action, managed to source an Intellian i4 — a dish built for …read more

Adafruit Blog News

3D Ghost Using a 2D Screen #ElectronicHalloween

Awesome 2025 build from UK engineer Dr Jon EA, via YouTube: Reusing the Waveshare 1.64in AMOLED display to create Pepper’s Ghost of a Nazgul. Halloween is Magic! More details up on Hackster.io as well! HAPPY HALLOWEEN! All month on the Adafruit Blog we’ll be bringing you ideas and projects for an Electronic Halloween Learn, Shop […]

Hacking a marine radio dish

melanpan.nl picked up a used Intellian i4 marine satellite dish on Marktplaats for about €200, against a new price near €4000. The dish uses stepper motors, a quad LNB, and an indoor Antenna Control Unit with Ethernet, WiFi and RS-232. The ACU expects a boat to tell it where it is and which way it […]

Whistle speech-to-text running fully on an ESP32-S3

Saulo Verissimo has published whistle-esp32 on GitHub, a speech-to-text demo that runs entirely on an ESP32-S3. Hold a button, say something like “make it red” or “flash the light blue”, and the board’s onboard WS2812 LED does it. No network, no cloud, no phone. It transcribes free speech rather than matching a fixed list of […]

Train a balance bot with reinforcement learning

Shawn Hymel wrote a guide in Make: Volume 99 on training a two-wheeled balance bot with reinforcement learning instead of a classical control loop. The agent is trained with proximal policy optimization, or PPO, the algorithm OpenAI published in 2017 that is still used for robot control and for fine-tuning large language models. Training was […]

µTari Go: a handheld Atari 2600

Nick Bild has built a handheld Atari 2600 that runs on real Atari silicon. Writing at Hackster.io, Bild describes the µTari Go as a portable version of his earlier µTari project, which shrank the Atari 2600 motherboard from about 9.75 x 5.25 inches to 4.7 x 3.5 inches. It uses the original 6507 processor, TIA, […]

Electronics Weekly News

DigiKey adds to its Standard Product range

DigiKey has expanded its DigiKey Standard Product range, which addresses the “everyday needs of engineers, technicians and makers”. Its own-label product line now includes a soldering station, an ESD silicone […]

The post DigiKey adds to its Standard Product range appeared first on Electronics Weekly.

Tesla’s R&D Costs Rising

Tesla’s R&D spending is rising significantly faster than its revenue. In Q1 2026, the company’s R&D-to-revenue ratio reached a new high of 8.7%, up from 3.3% in early 2023. By […]

The post Tesla’s R&D Costs Rising appeared first on Electronics Weekly.

Microchip adds LX-820 Quartz Oscillator to L-Series for LEO apps

Microchip is adding the LX-820 Radiation-Tolerant Quartz Oscillator to its L-Series of timing devices. The part is designed for Low Earth Orbit (LEO) and other space applications. The L-Series is […]

The post Microchip adds LX-820 Quartz Oscillator to L-Series for LEO apps appeared first on Electronics Weekly.

Anduril and Qualcomm hook up for ruggedised laptop

Yesterday, Anduril  and Qualcomm said they had developed a prototype of a ruggedised laptop assembled in the US with 90% of its components sourced in the US. They call it […]

The post Anduril and Qualcomm hook up for ruggedised laptop appeared first on Electronics Weekly.

Lam and Imec pursue 3-D integration

Lam and imec are collaborating to accelerate manufacturing readiness for 3D integration technologies supporting advanced packaging and next-generation memory. By bringing together Lam’s capabilities in deposition and etch with imec’s […]

The post Lam and Imec pursue 3-D integration appeared first on Electronics Weekly.

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