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.

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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.

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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

Can Jensen Keep His Job?

Nvidia CEO admits to romantic affair with Megaspeed managing director, a known Chinese intelligence asset.

The post Can Jensen Keep His Job? appeared first on EE Times.

Advancing Integrated Optics: Celestica & Broadcom Interview at OCP Global Summit

Celestica and Broadcom explain how integrated optics can cut power and latency for AI data centers—watch the OCP Summit partner interview.

The post Advancing Integrated Optics: Celestica & Broadcom Interview at OCP Global Summit appeared first on EE Times.

Powering AI Data Centers: Rethinking Energy Infrastructure for the Next Wave of AI Growth

AI data centers need faster, resilient power; learn how microgrids, storage, and intelligent controls can ease grid constraints in this partner interview.

The post Powering AI Data Centers: Rethinking Energy Infrastructure for the Next Wave of AI Growth appeared first on EE Times.

Still Looking for Diamonds

Silicon carbide demand surges, but Europe risks hollow sovereignty as investment flows abroad; see why Bulgaria’s fab needs customers first.

The post Still Looking for Diamonds appeared first on EE Times.

Designing Smarter Security and Portable Camera Systems

Security and portable camera designers must balance image quality, power consumption, connectivity, and system cost across widely different operating environments. This guide provides a practical system-level reference for surveillance cameras, video doorbells, body cameras, trail cameras, action cameras, and dashboard cameras. It explains how low-power motion detection, high dynamic range, near-infrared sensitivity, and region-of-interest processing […]

The post Designing Smarter Security and Portable Camera Systems appeared first on EE Times.

Hackaday News

UDP Broadcasting Meets the More Focused Multicasting

After previously exploring the basics of UDP broadcasting, why IPv4 subnets are an exciting feature that you really want to dive into, as well as the contentious topic of IPv6, …read more

Reverse Engineering a 1960s Diode-Transistor Logic IC

Before transistor-transistor logic (TTL) took over, diode-transistor logic (DTL) was a common sight especially in pre-IC circuits where it was a major improvement over resistor-transistor logic (RTL). That said, it’s …read more

Radon Active

When you think about nuclear radiation, you often think about power plants, but it turns out there’s radioactive stuff all over the place: smoke detectors, granite counters, bananas, and potatoes …read more

Web Satellite Tracker Plays the Music of the Spheres

There are a dizzying number of satellites in orbit around the Earth these days, and more are being added at an incredible rate. Those of us with an interest in …read more

Determining Location by Listening for Airplanes

Beyond what people deliberately disclose, there’s a surprising amount of information hidden in everyday messages, especially photos and videos. Even when people try to hide the location or time at …read more

Adafruit Blog News

Smart Humidity Monitor & Alert System with Windows GUI

Mousavi posted a humidity monitor on Hackster.io that watches a room and says when it’s time to switch on a humidifier. The original plan was full automation: a DHT11 sensor and a 5V relay to power a cool mist humidifier when the air got dry. That didn’t work. The humidifier has its own logic controller […]

ESP32-C3 fishing line counter with a 3D-printed wheel

XiaoGai has posted a fishing line counter on Hackster.io, built from an ESP32-C3 SuperMini, a 0.96-inch SSD1306 OLED, an A3144E Hall module, a tactile button and a 3D-printed wheel. It doesn’t need a custom PCB or a pinch roller. The line wraps once around the wheel on the side of the case. Pulling the line […]

Making a dog car wash without (very) fancy tools

Fenix Guthrie writes on Hackaday about a dog washing machine built by Stuff Made Here, which works like a drive-through car wash scaled down for a pet. An arch sprays the dog from oscillating nozzles that ride on linear rails driven by a DC motor. A second nozzle on the pods blows air to dry […]

Why do some people hear pitch better than others? Internal noise may be the key

Woon Ju Park, writing in Scientific American, describes new research on why people who lost their sight early in life often hear so well. The study, published in the Journal of Neuroscience, points to something called internal noise: how consistently the auditory system responds to the same sound over and over. Less internal noise means […]

Play text adventures on an e-paper handheld

Jeremy Ngai Sew Poh has posted InkQuest on GitHub, a handheld text adventure game built around an ESP32, an e-paper display and a rotary encoder. The story text shows on the e-paper screen, the encoder scrolls through the choices, and a press picks one. Instead of a fixed script, the choices and the story come […]

Electronics Weekly News

Google expands its 8th-Gen TPU portfolio for agentic AI

Google has expanded its eighth generation TPU portfolio with the TPU 8tx and TPU 8i Max. Following on from the TPU 8t and TPU 8i releases in April, it marks […]

The post Google expands its 8th-Gen TPU portfolio for agentic AI appeared first on Electronics Weekly.

Aratas introduces G6TA series of reed relays for safety-monitoring

Aratas is introducing its G6TA series of reed relays, providing 200V DC switching capability for safety-monitoring circuitry. Specifically, the relays comprise type-1a (SPST, single-pole single-throw) and type-2a (DPST, double-pole single-throw) […]

The post Aratas introduces G6TA series of reed relays for safety-monitoring appeared first on Electronics Weekly.

CesiumAstro satellite antenna specialist raises $730m

CesiumAstro, the satellite antenna specialist, has closed $730 million in Series D financing. Its payloads – the company highlights – combine active phased array antennas, RF front ends, analogue and […]

The post CesiumAstro satellite antenna specialist raises $730m appeared first on Electronics Weekly.

Jensen Huang apologises: Nvidia board investigates

After Jensen Huang (pictured) admitted an affair with Alice Huang, a senior executive at Singapore datacentre company Megaspeed, who US intelligence officials believe is a Chinese spy. The board of […]

The post Jensen Huang apologises: Nvidia board investigates appeared first on Electronics Weekly.

TSMC rumoured to be eyeing 3D DRAM

TSMC is said to have appointed vice-president Hsu Kuo-Chin to look at how the company could get into 3D DRAM, according to multiple industry reports, but it would seem that […]

The post TSMC rumoured to be eyeing 3D DRAM appeared first on Electronics Weekly.

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