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

Canadian Startup Aims to Be Quantum’s ‘Picks’ and ‘Shovels’ 

Toronto-based Meissner Technologies uses AI and laboratory testing to discover superconducting materials that could cut cooling costs and help quantum computers scale.

The post Canadian Startup Aims to Be Quantum’s ‘Picks’ and ‘Shovels’  appeared first on EE Times.

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.

Hackaday News

Does Running an E-Paper Display at 30 FPS Destroy It?

Although e-paper displays are famous for being low-power and lasting essentially forever if not damaged physically, the recent push to drive even cheaper e-paper displays at a framerate like 30 …read more

C64 Keycaps For Everybody

If you’ve got an MX-style keyboard and want some retro charm, you might like a recent project from [Levente Szabadkai]. It’s a set of C64-style keycaps that you can print …read more

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

Adafruit Blog News

Can AI design a working PCB? @JLCPCB

JLCPCB posted on X about a board designed with the help of an AI agent working in KiCad. The builder, who goes by John, used the workflow to produce a GNSS module based on the u-blox MAX-M10S receiver. The finished board measures 25 by 36.5 mm and uses a 4-layer stackup. It was manufactured and […]

Reach your ESP32’s web page from anywhere

Pinscope has posted a tutorial on hackster.io that makes an ESP32’s own web page reachable from outside the local network, without a port forward or a VPN. The device opens one outbound connection and gets an HTTPS address, live logs, charted metrics, decoded crash reports and over the air firmware updates. Setup is one ESP-IDF […]

MP3 player cassette, version 2

C Forde built an MP3 player shaped like a cassette tape, and posted the build on Hackster.io. It plays through headphones on its own, or it sits in a cassette deck and feeds audio to the player’s own head through a tape head mounted in the shell. Version 2 replaces most of the point to […]

Encrypted IoT networking via RF24Gateway with nRF24, nRF52x and nRF54x. Coming soon

TMRh20Projects posted on the Seeed Studio forum about adding encryption to RF24Gateway. The work builds on nrf_to_nrf, a library for direct radio communication on XIAO nRF52840 and nRF54L15 boards. It does not use Bluetooth or Zigbee. It uses the Enhanced ShockBurst (ESB) protocol and direct radio access. The library already included AES/CCM encryption, and that […]

The IBM PC 5150, Revision A vs Revision B

Dave Farquhar at The Silicon Underground compares the two versions of the original IBM PC 5150, pegged to the October 27, 1982 date on the Revision B BIOS. The fronts look identical. The back tells you which one you have: Revision B is marked with a B in a circle and has positions for five […]

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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