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

The Countdown to Q-Day Has Begun

Will a quantum computer break blockchain cryptography in just two years' time?

The post The Countdown to Q-Day Has Begun appeared first on EE Times.

Cosmic at SEMICON Europa 2026: Advancing High-Complexity Semiconductor Test Solutions

ALTOPASCIO, Italy — Nov. 9, 2026 — Cosmic Group will participate in SEMICON Europa 2026 in Munich, held concurrently with electronica from Nov. 10 to 13, 2026. Cosmic will be located at booth C1255. Rooted in the tradition of technological innovation “Made in Europe,” the group aligns perfectly with this year’s event focus: “Europe’s Next […]

The post Cosmic at SEMICON Europa 2026: Advancing High-Complexity Semiconductor Test Solutions appeared first on EE Times.

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.

Hackaday News

An FPGA Version of the AT&T UNIX PC for MiSTer

We all have our childhood heroes, which in the case of [Hrvoje Cavrak] was the 1985 AT&T UNIX PC. This 18 kg behemoth of a workstation computer boasted a 10 MHz …read more

Making a Dog Car Wash Without (very) Fancy Tools

[Stuff Made Here] got fed up with the hassle of washing their dog, and in traditional engineer fashion, decided that automating the process would solve the problem. However, as science …read more

Artemis II Rocket Was Powerful Enough to Disrupt GPS

Rockets certainly have a substantial impact if you ever see a launch in person. The noise, shock waves, and even heat can be awe-inspiring. What is less obvious are the …read more

Play Text Adventures on an E-Paper Handheld

Choose your own adventure books were one of the first media to become gamified in the computer era, and [Jeremy Ngai] wanted to bridge the experience further with an e-paper …read more

Proper Linux, On An ESP32

The ESP32 series of microcontrollers feature a lot on these pages, offering as they do a significantly powerful processor and in most cases, wireless connectivity. One recent member of the …read more

Adafruit Blog News

Ham radio operator helps police with robbery #HamSunday

Wikipedia has a detailed account of the Baker Street robbery, the September 1971 burglary of safety deposit boxes at the Lloyds Bank branch at 185 Baker Street in London. A gang rented a leather goods shop two doors away and dug a 40 foot tunnel to come up under the vault floor. A jack failed, […]

Adafruit New Products this Week: LT8912B DSI to DVI Converter

We’ve got the New nEw NEW for you right here Coming Soon! Adafruit LT8912B DSI to DVI Converter Visit www.adafruit.com/new for more info. Want to get new products info beamed straight into your inbox? New nEw NEWs From Adafruit is an email newsletter sent once a week to subscribers only. It features new products, special […]

Build Your Own E-Reader for $40

Allan Binder of MUON SORTES shares this how to guide for building an affordable e-reader. And head to Allan Binder‘s instagram for a more polished look and future iterations. You need four things: an ESP32-S3 dev board, an e-paper panel with its adapter board, a five-way button module, and a way to power it. Total […]

What is STEMMA QT?

Put simply STEMMA QT is the cute version of a STEMMA connection. STEMMA is a plug-and-play board and sensor system that lets you quickly plug together various devices and accessories, without any soldering! STEMMA QT is the smallest STEMMA connector and is used for 12C communication. See more from the Adafruit Learning System: What is […]

Egg Carrier – Transport Box for Up to 12 M+L Eggs #3DPrinting

A transport box designed to safely carry up to 12 eggs (size M and L). Compartments keep eggs separated and protected during transport. For backyard chicken owners, farmers, camping trips, and everyday kitchen use — reusable alternative to disposable cartons. Press-fit small arms (no glue needed; scale down slightly if too tight). Glue to fix […]

Electronics Weekly News

Leap signs MoU to relaunch Sutherland space launches

Leap, a startup aiming to develop mass-producible launch vehicles, has signed a Memorandum of Understanding (MoU) with Highlands and Islands Enterprise (HIE). This is to develop, and relaunch, space launch […]

The post Leap signs MoU to relaunch Sutherland space launches appeared first on Electronics Weekly.

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.

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