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

Jensen Resigns Over Second Affair

Nvidia CEO’s second affair scandal in a week prompted his resignation, and the board is now searching for a new leader for the company.

The post Jensen Resigns Over Second Affair appeared first on EE Times.

Design Smarter – Energy Harvesting for Battery-Free and Low-Maintenance Devices in Safety & Security applications

Battery-powered sensors and detectors underpin modern safety and security systems, yet they create a constant maintenance burden. Hundreds of devices need manual battery swaps, often in hard-to-reach places, interrupting reliability and raising costs.This document paper shows hardware and system designers how to power devices from ambient energy. It covers the full energy chain, offers a […]

The post Design Smarter – Energy Harvesting for Battery-Free and Low-Maintenance Devices in Safety & Security applications appeared first on EE Times.

Can Machines See a Sick Plant Before a Farmer Can?

Soybean disease research shows the promise of hyperspectral imaging, while semiconductor advances could make spectral sensing affordable for farmers.

The post Can Machines See a Sick Plant Before a Farmer Can? appeared first on EE Times.

Connecting AI to the Physical World

Why specialized wireless devices and SDR software IP matter to the next wave of intelligent machines

The post Connecting AI to the Physical World appeared first on EE Times.

Harari Warns Tech Leaders Against Pursuing AI Superintelligence

At Gartner IT Symposium/Xpo 2026, philosopher Yuval Noah Harari makes an appeal to delay artificial superintelligence as it threatens to erode human agency and democratic sovereignty.

The post Harari Warns Tech Leaders Against Pursuing AI Superintelligence appeared first on EE Times.

Hackaday News

Upgrade Your CoCo The Modern Way

The Radio Shack TRS-80 Colour Computer may never have achieved the sales volume of its competitors from Commodore or Apple, but it offered a surprisingly capable set of hardware. There …read more

Baochip-1x: A Mostly-Open, 22nm SoC for High Assurance Applications

For most people, just getting any old microcontroller or system on chip (SoC) from our favorite – or cheapest – vendor is more than good enough. But if you’re really …read more

Just Use QWIIC Already

Years ago, I wrote an article describing different I2C-on-a-connector ecosystems, explaining their strengths, weaknesses, and implementation details, as well as piling on a heap of fun stories. Looking back at …read more

USB-C Hub or Nintendo Switch 2 Dock? Relax, It’s Both!

[Nozomi] travels with a Nintendo Switch 2, but the official dock is bulky and doesn’t seem to be made for travel. USB-C hubs with displays are common, but they won’t …read more

The Sextant: Navigating The Old Way

Navigation is easy these days, as we’ve entire complex computerized mapping systems and radio-based positioning systems to find ourselves anywhere on Earth. It might seem simple to use GPS these …read more

Adafruit Blog News

CircuitPython 11.0.0-alpha.3 Released!

From the GitHub release page: This is CircuitPython 11.0.0-alpha.3, an alpha release for 11.0.0. Further features, changes, and bug fixes will be added before the final release of 11.0.0. CircuitPython libraries from the 10.x bundles are still compatible with CircuitPython 11.0.0 builds. Highlights of changes since 11.0.0-alpha.2 Web workflow display mirroring. Add board.I2C(), board.SPI(), and […]

Helmet Stand – Modular Stand for Cosplay Helmets #3DThursday #3DPrinting

studioofmm shares: A modular helmet stand with Poles (~4.7h, 3 plates), Stand Tops (~8.7h, 4 plates), and Simple Bases (~7.8h, 2 plates). Multicolor-compatible (AMS). Used for Stormtrooper, Mandalorian, Darth Vader, Marvel cosplay helmets. 676 reviews. Includes video walkthrough + additional base design discs. Standard Digital File License (commercial via licensing). Serves the sci-fi prop category […]

Modular Lantern – Tiny Christmas Edition, Stackable Cross-Compatible System #3DThursday #3DPrinting

A stackable lantern system of cross-compatible 3D-printed parts. Change the lantern’s look with the seasons by swapping inserts and components. Tiny edition ~5cm wide, sized for a tea light. Works as a tree ornament or a small picture frame. Default fits a 37mm Bambu tea light; other sizes by slicer scaling (2× the diameter in […]

JP’s Product Pick of the Week 11/10/26 @adafruit @johnedgarpark #adafruit #newproductpick

If you missed this week’s livestream of John Park’s Product Pick of the Week, not to worry, here’s the video. This week’s pick is the RV-8803 High Accuracy Real Time Clock Breakout! Watch the video to find out about the RV-8803 High Accuracy Real Time Clock Breakout, how to use it, a live demo, and […]

Cutlery Drainer with Drip Tray #3DThursday #3DPrinting

shlomimarcovich shares: A modular kitchen organizer for forks, spoons, knives, and small utensils. Removable containers + drip tray for easy cleaning. Two profiles: ‘No-Supports Easy Print’ (~11.7h, 4 plates) or H2D full-set-on-one-plate (~9.8h, 2 plates). Free download; commercial use requires designer’s membership. Companion: separate Mini Sponge Holder model. Pairs with the Oct 22 Modern Kitchen […]

Electronics Weekly News

Jensen Huang resigns

NVIDIA’s Board of Directors announced today that Jensen Huang has resigned as President, Chief Executive Officer, and a member of the Board, effective immediately. Colette Kress, current Executive Vice President […]

The post Jensen Huang resigns appeared first on Electronics Weekly.

Why space electronics is a harder code to crack than Moore’s Law

Ionising radiation and its types Space vehicles do not need advanced node Moore’s Law follower chips with a billion-transistor count, just less-complex chips to handle navigation, commands, faults and transmit […]

The post Why space electronics is a harder code to crack than Moore’s Law appeared first on Electronics Weekly.

Fable: The Destructive CEO

26 years ago a digital company used its shares which had been inflated by a bubble economy to buy a company with traditional hard assets. The merger resulted in a […]

The post Fable: The Destructive CEO appeared first on Electronics Weekly.

Electronica – The latest news roundup

Don’t miss the Electronics Weekly roundup of all our latest news from Electronica, the bi-annual event running from 10-13 November in Munich. Electronica is the world’s biggest electronics show, and Electronics […]

The post Electronica – The latest news roundup appeared first on Electronics Weekly.

Electronica: DPO for students offers remote view for educators

Tektronix chose electronica to launch of the 1 Series digital phosphor oscilloscope (DPO), aimed at students and educators. Models have two or four analogue channels, 12bit vertical resolution, up to […]

The post Electronica: DPO for students offers remote view for educators appeared first on Electronics Weekly.

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