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Electronics Engineering Calculators

Accurate calculators for resistor, capacitor, LED, semiconductor and PCB design.

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PowerOhm's law, voltage drop, power and efficiencyPCBTrace width, copper, vias and impedanceRFWavelength, matching, link budget and antennasConvertersAWG, dBm, frequency and digital formats

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Try Ohm's Law, LED resistor, RC time constant, PCB trace width, Buck converter, AWG, or dBm.

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Calculators
186

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22

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Engineering Guides
21

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Reference Data
4

Published reference pages

Popular Calculators

High-frequency tools for component selection, board checks, RF planning and power budgets.

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Ohm's Law CalculatorResistorsCalculate voltage, current, resistance, and power from any two known values in a DC circuit.Open Calculator ->Voltage Divider CalculatorResistorsCalculate divider output voltage, reverse-solve R1 or R2, and check divider current and resistor power.Open Calculator ->LED Resistor CalculatorResistorsCalculate LED current-limiting resistance, the next higher E24 value, power rating, and total circuit current.Open Calculator ->RC Time Constant CalculatorCapacitorsCalculate RC time constant, charge and discharge timing, and reference voltages from resistance and capacitance.Open Calculator ->Capacitive Reactance CalculatorCapacitorsCalculate capacitive reactance and angular frequency from capacitance and AC frequency with engineering unit conversion.Open Calculator ->LC Resonance CalculatorInductorsCalculate LC resonant frequency and angular frequency, or solve inductance or capacitance for a target frequency.Open Calculator ->LED Current CalculatorLEDsCalculate LED operating current, resistor voltage drop, resistor power, LED power, and total circuit power.Open Calculator ->Non-Inverting Op-Amp Gain CalculatorOperational AmplifiersCalculate ideal non-inverting op-amp closed-loop gain from feedback and ground resistor values, including gain in V/V and dB.Open Calculator ->Battery Life CalculatorBatteriesCalculate battery life, required battery capacity, and average current from duty cycle with mAh, Ah, current, runtime, and efficiency inputs.Open Calculator ->RF Wavelength CalculatorRFCalculate RF wavelength, frequency, propagation velocity, velocity factor, quarter-wave length, and half-wave length for air, coax, transmission lines, fiber context, and custom media.Open Calculator ->RF Link Budget CalculatorRFCalculate RF link budget received power, EIRP, antenna gains, path loss, receiver sensitivity, required transmit power, maximum allowable path loss, and link margin.Open Calculator ->UART Baud Rate CalculatorCommunicationCalculate UART baud rate timing, bit time, character time, frame bits, transmission time, data rate and character rate for serial communication.Open Calculator ->

Component Categories

Browse the calculator library as an engineering index. Counts are generated from the active calculator registry.

Components

4 groups
ResistorsTools for resistance, voltage scaling, current limiting, resistor networks, and power checks.6 calculatorsCapacitorsRC timing, reactance, filtering, stored energy, and capacitor selection support.6 calculatorsInductorsInductance, LC resonance, stored energy, converter magnetics, and EMI filter tools.5 calculatorsLEDsLED current limiting, indicator circuits, LED arrays, strips, and power estimation.12 calculators

Semiconductors

4 groups
DiodesDesign aids for zener regulation, rectifiers, diode drops, clamping, and protection circuits.6 calculatorsTransistorsTransistor calculators for BJT switching, gain, bias design, saturation, power dissipation, and amplifier analysis.10 calculatorsMOSFETsSwitching device tools for conduction loss, gate drive, load switches, and thermal design.10 calculatorsOperational AmplifiersOp amp tools for gain, feedback, filters, signal conditioning, and analog applications.12 calculators

Board, Power and RF

4 groups
PCBBoard-level calculators for trace design, copper thickness, via current, and thermal constraints.10 calculatorsPowerPower electronics tools for regulators, converters, thermal margins, and component stress.10 calculatorsBatteriesBattery tools for capacity, runtime, charging, pack configuration, and energy budgeting.10 calculatorsRFRF tools for wavelength, impedance, antennas, RF power, matching, and wireless engineering.12 calculators

Interfaces and Converters

10 groups
CommunicationCommunication tools for UART, I2C, SPI, CAN, RS-485, throughput, latency, and embedded interfaces.12 calculatorsConvertersEngineering unit converters for RF power, wire gauge, numeric formats, and design workflows.4 calculatorsDigital LogicDigital electronics tools for logic, binary systems, coding, checksums, and timing.12 calculatorsFiltersFilter tools for cutoff frequency, bandwidth, resonance, passive filters, and active filters.12 calculators

Engineering Reference / Data

Reference pages and shared engineering datasets support calculators with traceable values, units and component conventions.

Engineering ReferenceLookup tables for component markings, preferred values and reusable engineering data.Component DataShared resistor and capacitor reference pages backed by structured engineering data.Standards NotesIEC preferred values, color codes, tolerance data and practical reference tables.Technical GuidesDesign-focused explanations linked to calculators and component topics.

Engineering Guides

Practical explanations that connect calculator inputs, formulas, component choices and common design mistakes.

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Converters

Engineering Unit Conversions for Electronics

Learn engineering unit conversions for electronics, including SI prefixes, powers of ten, engineering notation, resistance, capacitance, inductance, voltage, current, power, energy, frequency, time, PCB units, and common conversion mistakes.

22 min / Beginner

Converters

Frequency, Period & Time Conversion Guide

Learn frequency, period, time, PWM, phase delay, angular frequency, wavelength, RPM, and signal timing conversions using reciprocal formulas and correct engineering units.

24 min / Intermediate

PCB

Understanding PCB Trace Width, Current Capacity and Temperature Rise

Understand PCB trace width, current capacity, copper thickness, temperature rise, trace resistance, voltage drop, I²R power loss, IPC-2221-style estimates, IPC-2152 guidance, and practical high-current routing checks.

22 min / Intermediate

PCB

PCB Via Current Capacity and Thermal Design Guide

Learn how PCB via diameter, plating thickness, board thickness, resistance, current density, parallel via arrays, voltage drop, I²R heating, thermal vias, and stackup affect reliable high-current via design.

21 min / Intermediate

Power

Understanding Electrical Power

Learn the fundamentals of electrical power, including voltage, current, resistance, watts, energy, Ohm's law, DC and AC power, efficiency, power dissipation, and practical calculations.

18 min / Beginner

Power

Power Dissipation and Component Power Ratings

Learn how to calculate power dissipation and choose safe component power ratings for resistors, diodes, BJTs, MOSFETs, regulators, PCB traces, and power supplies using thermal limits, derating, and real operating conditions.

20 min / Intermediate