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.
At AutoSens Europe, automotive sensing designs reflected tighter safety standards, advances in AI processing, and growing cybersecurity requirements.
The post AutoSens 2026: Regulation Drives Automotive Sensing Architectures appeared first on EE Times.
Analog Devices India’s Praveen Jose said device miniaturization is driving higher performance and quality in smaller form factors.
The post Continuous Health Monitoring Drives Integrated Wearable System Design appeared first on EE Times.
Qualcomm introduced two distinct Snapdragon 8 Elite Gen 6 SoCs for high-end smartphones as it expands personal agentic AI across mobile, wearables, and PCs.
The post Qualcomm Doubles Down on Agentic AI at Snapdragon Summit 2026 appeared first on EE Times.
Join us where attendees will see how on-device processing improves resilience, reduces exposure of sensitive data, counters spoofing, and supports practical deployment across buildings, smart locks, vehicles and appliances.
The post Edge Computing and Security for Access Control Applications: Getting the Best of the Two Worlds appeared first on EE Times.
Are you struggling with PCBA defects? Learn how to optimize your PCBA testing strategy by combining In-Circuit Testing (ICT), Functional Testing (FCT with Bed-of-Nails or Flying Probe Testers.
The post PCBA Test Strategies: How to Select the Right Methodology and Tester appeared first on EE Times.
The most popular ones on the site include Micron having a $54bn revenue quarter, Anthropic revealing the biggest pre-IPO loss in history and TSMC looking to build six fabs in Texas...
The post Most Read – VersaBeam Mini, Micron booming, TSMC fabs appeared first on Electronics Weekly.
TDK is introducing its B3272*A/G/T series of DC-link film capacitors that are qualified for continuous operation at case temperatures of up to +135 °C, with no derating required up to […]
The post TDK DC-link film capacitors rated for up to +135 °C appeared first on Electronics Weekly.
The renowned UK semiconductor expert, Dr Ian Mackintosh, argued in his keynote address at the 1978 International Solid State Circuits Conference in San Francisco, that much of America’s dominance in […]
The post US Chip Dominance Will Disappear appeared first on Electronics Weekly.
Renesas Electronics is sampling the SLG46801, its smallest GreenPAK configurable mixed-signal device. The 9-ball device combines an ultra-small footprint with multi-time programmability, highlights Renesas. It is aimed at compact products […]
The post SLG46801 ultra-Compact GreenPAK IC offers multi-time programmability appeared first on Electronics Weekly.
Northumberland’s OpenWorks Engineering, a UK defence technology company, has announced its expansion into the US market. Specifically it is opening a US regional headquarters in Ashburn, Virginia. And future plans […]
The post OpenWorks eyes US market for AI-powered autonomous vision systems appeared first on Electronics Weekly.