Free practical electronics engineering calculators for circuit design, components, RF, power electronics, batteries, signal analysis and electrical engineering.
Explore calculators covering fundamental circuits, passive components, RF and signal analysis, batteries, electrical units and practical hardware engineering.
Calculators for voltage, current, resistance, power, dividers, time constants and resonance.
Practical calculators for resistors, capacitors and inductors used in everyday circuit design.
Calculators for wavelength, frequency, antennas, dB, dBm and signal relationships.
Tools for electrical power, batteries, stored energy and practical power-system calculations.
Convert frequency and period and work with timing relationships used in digital and analog electronics.
Convert common electrical engineering units and signal levels quickly without leaving the Octopart platform.
Browse the available Octopart.org calculators. Each tool provides the relevant formula, inputs, worked examples and practical engineering notes.
Fundamental voltage, current, resistance, power and circuit relationships.
Calculate voltage, current, resistance and power using Ohm's law.
Open CalculatorCalculate divider output voltage, current and resistor power.
Open CalculatorCalculate current distribution through parallel resistor branches.
Open CalculatorCalculate electrical power from voltage, current and resistance.
Open CalculatorCalculate RC and RL time constants and related circuit timing values.
Open CalculatorCalculate LC and RLC resonant frequency from inductance and capacitance.
Open CalculatorComponent values, combinations, stored energy and electrical characteristics.
Decode 3-digit, 4-digit, R-marked and EIA-96 SMD resistor markings.
Open CalculatorDecode resistor values from common color-band markings.
Open CalculatorCalculate total resistance, circuit current, voltage drops and power for series resistors.
Open CalculatorCalculate equivalent resistance for parallel resistor networks.
Open CalculatorCalculate capacitive reactance from frequency and capacitance.
Open CalculatorCalculate inductive reactance from frequency and inductance.
Open CalculatorCalculate equivalent capacitance, charge and voltage distribution.
Open CalculatorCalculate total capacitance for parallel capacitor networks.
Open CalculatorTools for frequency, wavelength, antennas, signal levels and RF engineering.
Estimate quarter-wave and other antenna lengths from operating frequency.
Open CalculatorConvert voltage ratios to dB and dB values back to voltage ratios.
Open CalculatorConvert RF power levels between dBm, watts, milliwatts and microwatts.
Open CalculatorConvert frequency to period and period to frequency across common units.
Open CalculatorPractical tools for electrical power, battery capacity and stored energy.
Estimate battery runtime from capacity, voltage, load and efficiency.
Open CalculatorConvert electrical engineering quantities and signal-related units.
Convert common electrical units including voltage, current, resistance, capacitance, inductance, frequency and power.
Open ConverterConvert between frequency and wavelength for RF, optical and acoustic applications.
Open ConverterThe calculator library will continue expanding into PCB engineering, embedded systems, power electronics, RF and hardware manufacturing.
Ohm's law, voltage and current dividers, resistance, power, capacitors, inductors, RC circuits and resonance.
Resistor color codes, SMD markings, capacitor codes, component combinations, energy storage and practical component calculations.
Wavelength, antennas, dB, dBm, attenuation, signal ratios, RF systems and transmission-line calculations.
Trace width, via current, impedance, PCB stackups, converters, batteries, thermal calculations and power-system tools.
Future tools can include UART, SPI, I²C, PWM, clocks, BOM analysis, PCB manufacturing, assembly and hardware production utilities.
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.
Stay updated with the newest trends in electronics, hardware, and embedded systems.
Choose timing with confidence: compare crystals, oscillators, RTCs, MEMS, and atomic references for reliable designs—download the guide.
The post Precision Timing Special Report appeared first on EE Times.
Following the unveiling of its EPIC Center, Applied Materials revealed strong financial projections. We look at how it all ties together and feature a new video interview with CEO Gary Dickerson.
The post Video Interview: Applied Materials CEO on the Economics Behind Its $5B EPIC Bet appeared first on EE Times.
The verdict is the latest chapter in a four-year IP dispute between the two chip giants, safeguarding Qualcomm's custom processors while placing financial pressure on Arm.
The post Qualcomm Wins Key Claims Against Arm, but Damages Total Just $2 appeared first on EE Times.
This year’s Nobel prizes explained large systems through their smallest parts. What can chip design learn from them, and can AI help us design in the other direction too?
The post From Macro to Micro, and Back appeared first on EE Times.
The trillion-dollar semiconductor industry is ready to adapt and expand its fab infrastructure for the AI wave.
The post SEMICON West 2026 Displays AI-Era Chipmaking, Workforce Development appeared first on EE Times.
Spectrum Instrumentation has introduced a new firmware option for its high-resolution 59xx series digitizers to perform onboard summation averaging. The tool is for reducing unwanted signal noise while and improving […]
The post Spectrum Instrumentation digitisers get onboard averaging function appeared first on Electronics Weekly.
Tesla unveiled its flying Roadster last week, marking a return to the company’s roots. The very first vehicle Tesla ever sold was an electric sports car. The new Roadster is […]
The post Who Wants A Sports Car? appeared first on Electronics Weekly.
CML Micro has released a power amplifier for ISM-band radio designs. The CMX90A002 is delivered in a 3mm x 3mm QFN module and supports the 868MHz – 915MHz licence-free ISM […]
The post Power amplifier in 3x3mm QFN targets ISM-band radio appeared first on Electronics Weekly.
ORCA Computing, a spin out from the University of Oxford, is launching the PT-3, the latest generation of its photonic quantum computers. The first system is live in the Digital […]
The post ORCA launches PT-3 photonic quantum computer appeared first on Electronics Weekly.
A multi-band mobile radio front-end module, the FFM51010 is available from Forefront RF. It is claimed to be the only front-end module that suports all major low bands in the […]
The post Multi-band RF module suports “all major” low bands appeared first on Electronics Weekly.