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

Arm Comments on Jury Decision in Qualcomm Trial

Arm's Ami Badani cites the $2 nominal damages award as validation, while chip design experts point to open architectures such as RISC-V as the long-term alternative for AI workload flexibility.

The post Arm Comments on Jury Decision in Qualcomm Trial appeared first on EE Times.

Two Dollars and a Test Suite

The $2 damages award grabbed headlines, but the Arm-Qualcomm verdict’s bigger implication concerns who controls the compliance tests that custom chips must pass before shipping.

The post Two Dollars and a Test Suite appeared first on EE Times.

From Cloud AI to Edge AI: How BIWIN Enables the Next Generation of Storage and Memory Solutions

See how BIWIN’s SSD, embedded storage, and memory portfolio supports faster, efficient AI from cloud data centers to edge wearables.

The post From Cloud AI to Edge AI: How BIWIN Enables the Next Generation of Storage and Memory Solutions appeared first on EE Times.

Deepx Building Open Software Ecosystem to Scale Physical AI Beyond the Data Center

Deepx is combining low-power AI accelerators and portable software with industry partnerships to bring physical AI into production.

The post Deepx Building Open Software Ecosystem to Scale Physical AI Beyond the Data Center appeared first on EE Times.

How Goodram Validates DRAM and SSD Reliability in Europe

Explore Goodram’s European approach to DRAM and SSD testing, from burn-in to platform validation, for reliable industrial and embedded systems.

The post How Goodram Validates DRAM and SSD Reliability in Europe appeared first on EE Times.

Hackaday News

Pushing Bluetooth out to 12 Kilometers

Bluetooth is a short-range protocol that’s great for peripherals and finding your keys, but it’s limited range is mainly a product of how it’s usually implemented. A recent video from …read more

Remembering the Weirdest Nintendo DSi Accessory

The Nintendo DSi was released in November 2008, and boasted a new feature not formerly seen on the brand’s handhelds—it had two cameras, inside and outside. It let the console …read more

The Slurptop is Both Drool Worthy and Practical

There are two kinds of cyberdeck: the kind someone makes on a lark and operates purely on ‘rule of cool’, and the kind designed to do practical work. The Slurptop …read more

2026 Retrocomputing Challenge: I Would Do Anything For Serial Data

These days we take high-speed networking for granted, but it can be difficult to get vintage computers talking to modern machines. To help solve this problem [jaime] came up with …read more

That Weird 7-Pin S-Video Port on Old Laptops

Even though laptops from around the early 2000s came with just about every conceivable port on them, they still would often feature a somewhat unusual combined video output port. While …read more

Adafruit Blog News

Observe El Niño with NASA

This visualization compares three ocean data products, sea surface temperature anomaly, apparent visible wavelength, and sea surface height anomaly, over the same months in 2025 and 2026. Signals of El Niño in each map are highlighted with pop-up labels. Credits: NASA’s Scientific Visualization Studio via NASA Keep tabs on El Niño with NASA’s satellites. A […]

ESP32-Powered Talking Smoke Pumpkin #ElectronicHalloween

This is a paper papier-mâché jack-o-lantern that emanates smoke and lights up with the help of an ESP32. Once trick-or-treaters are near an ultra sonic sensor triggers a terrifying sequence including  a very creepy voice recording. Shared by DBMaking on Instructables. The protagonist is this creepy talking pumpkin that spits fog and speaks with a […]

Sound Reactive Paper Lanterns with LedFx

Make a strand of sound reactive paper lanterns and hang them in your space. Control them with a Feather ESP32 running WLED software. Add sound reactive animations using the sound on your computer over WiFi using the free, open source LEDFx software. This software makes it easy to add customizable sound reactivity to your lights. […]

GitHub – ankur608/ArduinoUnoQ_AdafruitTouch

Developer ankur608 has published an open source Arduino library on GitHub for using the Adafruit 2.8″ TFT Touch Shield v2 with Capacitive Touch (PID 1947) on the Arduino UNO Q, which runs an STM32U585 core. The shield carries its SPI lines on the 6-pin ICSP header rather than pins 11 through 13. On the UNO […]

The Hidden Speakers of Cirque du Soleil’s “O”

Matt Obernesser, head of audio for Cirque du Soleil’s O, takes Dallas Taylor on a sound tour. This one’s for the audio folks!

Electronics Weekly News

Most Read – xMCUs, NVHBM base dies, Qualcomm layoffs

Google and Synaptics launching an xMCU, datacentre CPU growth outpacing GPUs and ASICs, and Microsoft pulling out of Nscale's UK datacentre project...

The post Most Read – xMCUs, NVHBM base dies, Qualcomm layoffs appeared first on Electronics Weekly.

Space Tech Expo Europe to say farewell to Bremen

Space Tech Expo Europe 2026, which runs 17-19 November, is heading to Bremen for the last time. This is ahead of a move to Frankfurt in 2027. Showcasing space technology, […]

The post Space Tech Expo Europe to say farewell to Bremen appeared first on Electronics Weekly.

Soft Switching Or Hard?

28 years ago, EW ruminated on the benefits of hard switching vs. soft switching. This is how it went: Soft switching technologies were, and are, hailed as the solution to […]

The post Soft Switching Or Hard? appeared first on Electronics Weekly.

Vector’s Rust-based IEEE 11073 SDC stack qualifies for medical devices

Vector has redeveloped its IEEE 11073 SDC (Service-oriented Device Connectivity) stack in the Rust programming language to improve software quality and security. The new stack is designed to help medical […]

The post Vector’s Rust-based IEEE 11073 SDC stack qualifies for medical devices appeared first on Electronics Weekly.

Babcock, BAE Systems launch Apprenticeship Talent Bridge

Babcock and BAE Systems are launching the Apprenticeship Talent Bridge, an initiative to connect apprenticeship applicants with small and medium sized enterprises (SMEs) across the defence supply chain. They are […]

The post Babcock, BAE Systems launch Apprenticeship Talent Bridge appeared first on Electronics Weekly.

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