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.
Kiloampere busbars, 2,000 V solar platforms, hollow-shaft robot joints and nanoamp standby budgets are pulling magnetic sensing in directions no single sensing principle can follow. Ask a traction inverter designer, a robotics engineer and someone building a battery-powered water meter what they need from a magnetic sensor, and you will get three answers with very […]
The post Why Magnetic Sensor Selection Has Become a System Architecture Decision appeared first on EE Times.
Quantum investors weigh technical progress against customer demand, commercial timing, and the ability to build lasting value.
The post What Makes a Quantum Company Valuable? appeared first on EE Times.
This event session is presented by Olivia Wu, Distinguished Engineer at Meta AI model architectures are evolving faster than traditional chip development cycles, and at Meta’s scale—serving billions of users across ranking & recommendation and generative AI workloads—this mismatch is untenable. Meta’s Infra Silicon team has responded with a six-month SoC tape-out cadence, delivering four […]
The post Chiplets: Meta-Scale Chiplet Velocity Accelerating AI SoC Development to Match the Rapid Evolution of AI Model appeared first on EE Times.
The land grab for silicon photonics aims to beat the power wall associated with copper interconnects. We also interviewed Salience Labs about its $125 million funding for optical circuit switching.
The post Silicon Photonics Hits the Big Time appeared first on EE Times.
ABLIC’s Satoshi Hanazawa discusses its low-power analog semiconductor strategy, target markets, product innovation and development approach.
The post ABLIC’s Small, Smart, and Simple Strategy for High-Value Analog Semiconductors appeared first on EE Times.
The final stop for a genius on whose shoulders Einstein said he stood. Moral: Genius does not need a monument
The post Fable: RIP appeared first on Electronics Weekly.
Synov Group will be introducing Synov-Proto, its online PCB rapid prototyping service, at electronica in Munich ahead of its launch on 1 December 2026. Aimed at design offices, manufacturers and […]
The post Electronica: Synov-Proto launches as online PCB prototyping service appeared first on Electronics Weekly.
Automotive vehicle-to-everything is the bridge between today’s traffic challenges and tomorrow’s seamless mobility, writes Payam Pajoohi. The National Highway Traffic Safety Administration estimates that vehicle-to-vehicle (V2V) alone could cut crashes […]
The post Talking vehicles appeared first on Electronics Weekly.
Some people call it RAMageddon, which may be a bit extreme, but there's no doubting the tech backwash in terms of memory supply. As well as drinking the water, the AI hyperscalers are distorting the market for consumer memory...
The post RAMageddon pushes Raspberry Pi pricing higher appeared first on Electronics Weekly.
MP Space has raised $16 million in seed funding to develop its spacecraft power technology – generating, storing and managing power for satellites. The round was led by Blackbird VC, […]
The post MP Space raises $16 million for spacecraft power development appeared first on Electronics Weekly.