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

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.

CopperPilot Raises Pre-seed to Develop AI Agent for PCB Design

CopperPilot’s CEO said the startup has built its AI design agent so that “no hardware team is ever blocked because a board is too hard to design.”

The post CopperPilot Raises Pre-seed to Develop AI Agent for PCB Design appeared first on EE Times.

Quantum Computing’s Energy Bill Is Coming, and We Haven’t Priced It In

Quantum computing’s future depends on measuring useful processing power against energy consumption and cost, not just qubit counts.

The post Quantum Computing’s Energy Bill Is Coming, and We Haven’t Priced It In appeared first on EE Times.

Using a Single Image to Optimize Urban Solar-Panel Orientation

Getting the most power from an urban-sited panel requires deep understanding of its surroundings.

The post Using a Single Image to Optimize Urban Solar-Panel Orientation appeared first on EE Times.

Automakers Reconsider In-Cabin Sensing for Euro NCAP Ratings

Stricter European safety assessment criteria are prompting car companies to replace steering-wheel sensors with consolidated in-cabin systems.

The post Automakers Reconsider In-Cabin Sensing for Euro NCAP Ratings appeared first on EE Times.

Hackaday News

Hacking a Marine Radio Dish

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

Airborne Particle Monitoring, the BIG way

Airborne micro particles can be a significant health hazard in a workshop, and thus it’s important to maintain a high standard of ventilation. But monitoring their concentration is also important, …read more

How a Single University Project Started Everything

If we care to cast an eye over the history of ubiquitous personal computing as we know it today, we might immediately point at the original IBM PC. After all, …read more

2026 Retrocomputing Challenge: Explore Space with a Credit Card Reader

The humble credit card reader — most of us have used hundreds, perhaps even thousands of them over the years. But even for folks like us, it’s not the sort …read more

Where Did Your Mouse Come From?

Many readers will be familiar with Douglas Englebart’s 1968 so-called “Mother of All Demos”, in which he described many of the devices and technologies we would be using two or …read more

Adafruit Blog News

The roadmap to becoming a computer vision engineer in 2026

Vinod Chugani has published a four-stage study plan for computer vision engineers at KDnuggets. Each stage builds on the one before it, and each ends with a portfolio exercise. Stage one is the math: matrix transformations, coordinate frames, projective geometry, and multi-view geometry, plus PyTorch tensor work and augmentation with Albumentations. Stage two covers Vision […]

An illustrated online book on Hewlett-Packard equipment

A free 550 page e-book collects classic Hewlett-Packard test gear from the 1950s to the 1990s, with photos, schematics notes and restoration tips. Most of the instruments covered are ones the writer owns and tested. Sections cover voltmeters, including the 400H vacuum tube voltmeter and the 410C with its photoconductive chopper amplifier, the 8640B signal […]

Python’s experimental just-in-time (JIT) compiler to be removed

Writing at LWN.net, jzb reports that CPython’s experimental just-in-time compiler is being removed. The JIT landed in CPython in 2024 for the 3.13 release. In June, the Python steering council paused work on the JIT in CPython’s main branch. The council wanted an accepted Python Enhancement Proposal first, one that addressed maintenance and compatibility concerns […]

You can now run Nintendo Switch games natively on iPhones and Macs

Zo Ahmed, writing for TechSpot, covered nxnative, an open-source project that converts Switch games a user already owns into native iPhone, iPad, and Mac apps. There is no emulator. The game’s original Arm code runs directly on Apple silicon. Only the Nintendo-specific parts get replaced: a small host program stands in for the Switch operating […]

nrf54-arduino-core: nRF54 Arduino core for XIAO nRF54L15 and other nRF54 boards

Lolren has published nrf54-arduino-core on GitHub, an Arduino core for Nordic’s nRF54L family that talks to the hardware at the register level. There is no Zephyr runtime underneath and no separate nRF Connect SDK install. Targets include the Seeed XIAO nRF54L15 and XIAO nRF54LM20A, HOLYIOT modules, generic modules and the Nordic nRF54L15 DK. The usual […]

Electronics Weekly News

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.

Japan argues Emissions vs Net Zero

Japan, like the UK, is embroiled in the net zero versus economic reality argument. Prime Minister Sanae Takaichi is for trimming subsidies on EVs , funding growth investments and cutting […]

The post Japan argues Emissions vs Net Zero appeared first on Electronics Weekly.

Infineon to put €1.1bn into GaN fab

Infineon intends to build the first high-volume 300mm GaN fab by investing around €1.1 billion in its llVillach site by 2034. The EU is contributing €319 million towards the cost. […]

The post Infineon to put €1.1bn into GaN fab appeared first on Electronics Weekly.

Panasonic adds to EVP series of tactile switches

Panasonic has expanded its EVP-BD, EVP-0B, EVP-CD, and EVP-BX Series of 6.0mm x 6.0mm SMD top-push, 2-terminal tactile switches with the introduction of the EVP-BX (quiet-type) switch. The new addition […]

The post Panasonic adds to EVP series of tactile switches appeared first on Electronics Weekly.

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