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

Applied Materials Bets $5B on a New Model for Chip Innovation

Applied Materials’ $5 billion EPIC Center brings chipmakers, equipment suppliers, and researchers together to accelerate semiconductor R&D and commercialization.

The post Applied Materials Bets $5B on a New Model for Chip Innovation appeared first on EE Times.

Embedded Graphics on an MCU – Without an Accelerator

Join this webinar and learn how to add LCD graphics to MCU projects without a display controller, accelerator, or external DRAM.

The post Embedded Graphics on an MCU – Without an Accelerator appeared first on EE Times.

EU CRA Readiness: 5 Steps Manufacturers Need to Take Now 

Consumer, industrial, networking, semiconductor, and software manufacturers face a broad product-cybersecurity regulation for the first time.

The post EU CRA Readiness: 5 Steps Manufacturers Need to Take Now  appeared first on EE Times.

Xanadu Builds Out Canadian Quantum Infrastructure

Manufacturing partnerships and public sector funding are moving Xanadu’s quantum technology toward manufacturable, utility-scale systems.

The post Xanadu Builds Out Canadian Quantum Infrastructure appeared first on EE Times.

Security Becomes a Sign-off Item

Europe’s CRA turns chip security into auditable sign-off, pushing silicon teams to prove resilience before 2027.

The post Security Becomes a Sign-off Item appeared first on EE Times.

Hackaday News

The Prusa Core One+ INDX, a Troubled Multi-Extruder Upgrade?

The Prusa Core One+ INDX is an interesting upgrade to the base FDM printer by Prusa, featuring eight independent extruders – hence the INDX – that in theory should allow …read more

The Hexa-Bouncer May Be The Most Overengineered Thing You See This Week

Sometimes, you want to build a simple project– the minimum viable product that solves your problem and nothing else. Other times you might be feeling a little extra, and want …read more

DARPA Lift Challenge Won by Helicopter

America’s mad scientists all have one dream: DARPA money. DARPA, the Defense Advanced Research Projects Agency, regularly throws round sweet, sweet tax dollars to push the envelope on any number …read more

Your Computer Memory is a Lie

When you first learn to program, memory seems pretty straightforward. You have a bunch of bytes, each with an address. If you want to read or write something, you specify …read more

Backup Tapes Come Back to the Homelab

It’s one of the great mysteries of computing, how somehow in the Year Of OLlama 2026, tape remains the god of cheap storage. A while back [Ben Pettis] recounted his …read more

Adafruit Blog News

Turn every escape room puzzle into a Home Assistant device

Djair Guilherme has released two open source Arduino libraries on Hackster that make an escape room puzzle show up in Home Assistant as a device. esp32_escaperoom runs on ESP32 boards and handles WiFi and MQTT. propmaker_escaperoom runs on the RP2040 using the Adafruit PropMaker Feather, has no network and talks to other puzzles over RS485. […]

Wireless-Tag WT32P4C5-43S is an integrated 4.3-inch ESP32-P4 + ESP32-C5 touch display devkit

Debashis Das writes at CNX Software about the Wireless-Tag WT32P4C5-43S, a 4.3-inch touch display development board that pairs an ESP32-P4 MCU with an ESP32-C5 wireless module for dual-band WiFi 6 on 2.4 and 5 GHz, Bluetooth LE, and 802.15.4. Earlier ESP32-P4 and ESP32-C5 boards needed a separate display. This one has the screen on board. […]

Ledger finds unauthorized hardware implant in CryptoBilis-sold wallet amid fund theft reports

The Hacker News reports that Ledger has paused sales of its hardware wallets through the reseller CryptoBilis after users in Southeast Asia reported stolen funds. Pseudonymous blockchain investigator Specter puts the losses at more than $86 million. Ledger says one of the affected users’ devices contained an unauthorized hardware implant. The company told anyone who […]

8-channel analog monitor with NXP HEF4052BP and Arduino

Robert Fletcher posted a project on Hackster that reads eight analog inputs using only two Arduino ADC pins. The part doing the work is the NXP HEF4052BP, a dual 4-channel analog multiplexer. Each switch section routes one of four analog signals to a common pin, and both sections share the same two address lines and […]

Stylophone Mini turns the classic pocket synth into a keychain

Synthhead at Synthtopia reports that Stylophone has released the Mini Original, a keychain-sized version of its stylus-played electronic instrument. The original Stylophone dates to 1968. The Mini keeps the metal keyboard, the attached stylus and a built-in speaker, shrunk down to something that hangs off a set of keys. It adds a vibrato effect, a […]

Electronics Weekly News

Gadget Watch: Sixfab AI HAT+ for Raspberry Pi 5

Thanks to the Raspberry Pi team highlighting this one: the Sixfab AI HAT+ for Raspberry Pi 5, a third-party AI accelerator board built around the DEEPX DX-M1M NPU.

The post Gadget Watch: Sixfab AI HAT+ for Raspberry Pi 5 appeared first on Electronics Weekly.

Ofcom and JOINER to study satellite spectrum coexistence

Ofcom and the JOINER Platform – a research network initiative – have agreed to collaborate to provide technical evidence for Ofcom’s consideration of future spectrum policies The goal is to […]

The post Ofcom and JOINER to study satellite spectrum coexistence appeared first on Electronics Weekly.

Apple Fold A Long Time Coming

Back in 1985 Apple patented this design for a folding phone: The hinge was located at the “bite” mark that opened sideways to reveal an earpiece and physical keypad. It […]

The post Apple Fold A Long Time Coming appeared first on Electronics Weekly.

MEMSensing bone-vibration sensor offers noise cancellation alternative

MEMSensing is launching its bone-vibration sensor into Europe. The compact MEMS device provides a voice reference for environmental noise cancellation in TWS earbuds (true wireless stereo) and other smart wearables. […]

The post MEMSensing bone-vibration sensor offers noise cancellation alternative appeared first on Electronics Weekly.

UK’s Drone Test Centre gets new NADIC facility

The UK’s Drone Test and Development Centre (DTDC) – at Westcott Venture Park near Aylesbury – is getting a new facility dubbed the National Autonomy and Drone Innovation Centre (NADIC). […]

The post UK’s Drone Test Centre gets new NADIC facility appeared first on Electronics Weekly.

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