Electronics Engineering Calculators

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

Engineering Platform

Calculators: 220
Component Categories: 22
Engineering Guides: 114
Reference Data: 59

Popular Calculators

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

NameCategoryPurposeAction

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 calculators CapacitorsRC timing, reactance, filtering, stored energy, and capacitor selection support.6 calculators InductorsInductance, LC resonance, stored energy, converter magnetics, and EMI filter tools.5 calculators LEDsLED 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 calculators TransistorsTransistor calculators for BJT switching, gain, bias design, saturation, power dissipation, and amplifier analysis.10 calculators MOSFETsSwitching device tools for conduction loss, gate drive, load switches, and thermal design.10 calculators Operational 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 calculators PowerPower electronics tools for regulators, converters, thermal margins, and component stress.10 calculators BatteriesBattery tools for capacity, runtime, charging, pack configuration, and energy budgeting.10 calculators RFRF 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 calculators ConvertersEngineering unit converters for RF power, wire gauge, numeric formats, and design workflows.4 calculators Digital LogicDigital electronics tools for logic, binary systems, coding, checksums, and timing.12 calculators FiltersFilter 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.

View all guides

Wire & Cable

Four-Wire Cable Resistance Measurement: Kelvin Sensing, Contacts, and Temperature

Measure milliohm conductor and installed-path resistance with Kelvin sense points, current reversal, thermal control, and load-drop checks.

15 min / Intermediate

Motors

Measuring Motor Kv, Kt, and Ke: Bench Methods and Datasheet Conventions

Extract motor constants from speed, generated voltage, current, and torque measurements while controlling convention and temperature errors.

15 min / Intermediate

LEDs

LED Optical Measurement: Flux, Beam, Illuminance, CCT, and Color Consistency

Validate LED lumens, candela, lux, chromaticity, CCT, and Duv with stated optical geometry, drive, temperature, instruments, and production variation.

17 min / Intermediate

PCB

PCB Differential Pair Routing: Return Paths, Skew, Via Transitions, and Validation

Carry differential impedance geometry into a complete routed channel with reference-plane continuity, intra-pair skew, transition symmetry, and measured validation.

17 min / Advanced

Filters

Twin-T Notch Filter Design: Matching, Depth, Trimming, and Measurement

Design balanced passive Twin-T ratios, then distinguish nominal notch frequency from finite depth while managing loading, drift, trimming, and bench validation.

15 min / Intermediate

Filters

Multiple-Feedback Band-Pass Design: Q, Gain, Tolerance, and Validation

Carry MFB band-pass frequency, Q, signed gain, real component ratios, op-amp limits, and measured half-power points through one explicit topology.

15 min / Advanced