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Electronics

Ohm's law, resistor codes, LED calculators, and circuit tools.

216 tools available

The Electronics tools handle the recurring calculations of circuit design and repair: Ohm’s law, resistor and capacitor codes, LED series resistors, voltage dividers, RC/RL time constants, power dissipation, and PCB trace sizing. Each one encodes the governing equation and the standard component series, so you get an answer plus the nearest real-world part value — not just an idealised number.

These calculators are built for the bench. Enter what you know, read what you need, and check the worked steps to confirm the method. Because the underlying relationships interlock — Ohm’s law feeds the power equation, which feeds resistor wattage selection — the tools cross-reference naturally, and several link straight to a knowledge base explainer so you can learn the theory behind the result. Everything is client-side, so it works in a workshop with no connection.

Three-Phase Power Calculator Calculator

555 Timer Calculator (Astable Mode) Calculator

555 Timer Calculator (Bistable Mode) Calculator

555 Timer Calculator (Frequency Divider) Calculator

555 Timer Calculator (Missing Pulse Detector) Calculator

555 Timer Calculator (Monostable Mode) Calculator

555 Timer Calculator (Pulse Stretcher) Calculator

555 Timer Calculator (Schmitt Trigger Mode) Calculator

Active Filter Order Calculator Calculator

ADC Resolution Calculator Calculator

ADC Averaging / Oversampling Tool

Aliased Frequency Calculator Calculator

All-Pass Filter Calculator Calculator

Antenna Length Calculator Calculator

Antenna Gain Calculator Calculator

Antenna Radiation Pattern Visualizer Viewer

Anti-Aliasing Filter Order Calculator Calculator

Audio Connector & Plug Chart Reference

Audio Equalizer Calculator Calculator

AWG Current Capacity (Ampacity) Tool

Bandgap Reference Calculator Calculator

Band-Pass Filter Calculator Calculator

Battery Cell Balance Current Calculator Calculator

Battery C-Rate Calculator Calculator

Battery Discharge Time Tool

Battery Life Estimator Estimator

Battery Series/Parallel Calculator Calculator

UART Baud Rate Calculator Calculator

Bit Error Rate (BER) Calculator Calculator

Binary / Decimal / Hex Converter Converter

BJT Voltage Divider Bias Calculator Calculator

Common Collector (Emitter Follower) Calculator Calculator

Common Emitter Amplifier Calculator Calculator

BJT h-Parameters Calculator Calculator

BJT Power Dissipation Tool

Boost Converter Duty Cycle Converter

Boolean Algebra Lab Calculator

Buck Converter Calculator Calculator

Cable Crosstalk Calculator Calculator

CAN Bus Termination & Stub Calculator Calculator

Capacitive Reactance (Xc) Tool

Capacitor Calculator Calculator

Capacitor Charge/Discharge Calculator Calculator

Capacitor Code Decoder Decoder

Li-ion CC/CV Charge Profile Calculator Calculator

Chip Select / Address Decoder Calculator

Diode Clamp Circuit Calculator Calculator

Clock Duty Cycle Tool

Coaxial Cable Loss Tool

Colpitts Oscillator Calculator Calculator

Cables & Connectors: Plug Type Charts Reference

CRC Calculator Calculator

Crest Factor Tool

Crystal Loading Capacitance Calculator Calculator

Ćuk Converter Calculator Calculator

Current Mirror Calculator Calculator

DAC Output Calculator Calculator

Darlington Pair Calculator Calculator

dBm / mW / W / dBW Converter Converter

Inductor DCR Current-Sense Calculator Calculator

DDR Length-Match Budget Calculator Calculator

Decibel Calculator Calculator

Delta–Wye (Y) Conversion Calculator

Power Derating with Temperature Tool

Differential Pair Impedance Calculator Calculator

Differential Termination Calculator Calculator

FIR Filter Coefficient Quantization Calculator Calculator

Diode Reverse Recovery Loss Tool

Depth of Discharge (DoD) Tool

Efficiency Calculator Calculator

EMI Filter Designer Tool

Ethernet PHY Budget Calculator Calculator

Eye Diagram Height & Width Calculator Calculator

Fan CFM – Airflow Requirement Tool

FFT Bin Width Tool

FFT Size & Bin Resolution Calculator Calculator

Flicker Index (Approx) Tool

Fourier Series Visualizer Viewer

Frequency ↔ Wavelength Tool

Frequency ↔ Period Tool

Fresnel Zone Calculator Calculator

Friis Free-Space Path Loss Calculator Calculator

Fuse Size Calculator Calculator

Gray Code Converter Converter

Hamming Code Calculator Calculator

Harmonics Distortion (THD) Tool

Transmitter Harmonics & Spur Calculator Calculator

Hartley Oscillator Calculator Calculator

HDMI TMDS Clock Calculator Calculator

Heatsink Thermal Resistance Tool

I²C Pull-up Resistor Calculator Calculator

λ/4 Impedance Matching Stub Calculator Calculator

Inductive Reactance (XL) Tool

Air-Core Inductor Calculator Calculator

Inductor Energy Tool

Buck Input Capacitor RMS Current Calculator Calculator

Inrush Current Calculator Calculator

CMOS Inverter Delay Calculator Calculator

JFET Self-Bias Calculator Calculator

Junction-to-Case Temperature Rise Tool

Kirchhoff's Laws Reference Reference

kVA ↔ kW Converter Converter

LC Resonant Frequency Calculator Calculator

Lead-Acid Float / Absorb / Equalize Calculator Calculator

LED Matrix Power Calculator Calculator

LED Resistor Calculator Calculator

LFSR Maximal Period Calculator Calculator

Li-ion SOC from OCV Calculator Calculator

Light Bulb Finder & Reference Tool

RF Link Budget Calculator Calculator

LLC Resonant Converter Calculator Calculator

Load Factor (Electrical) Tool

Logic Gate Simulator Tester

Boost Converter Duty Cycle Calculator Calculator

Multi-Feedback (MFB) Bandpass Filter Calculator Calculator

Microstrip Trace Impedance Calculator Calculator

Mixer / Amp IP3 Calculator Calculator

MOSFET Body Diode Loss Calculator Calculator

MOSFET Gate Drive Calculator Calculator

MOSFET Gate Charge Loss Tool

Motor Current Estimator Estimator

Motor Inrush Current Calculator Calculator

Induction Motor Slip Tool

NEMA Plug & Receptacle Chart Reference

Noise Figure Calculator Calculator

Noise Temperature ↔ Noise Figure Converter Converter

Notch Filter (Band-Reject) Calculator Calculator

Nyquist Sampling Check Tool

Ohm's Law Calculator Calculator

Op-Amp Gain Calculator Calculator

Op-Amp Offset Error Tool

Op-Amp Slew Rate Calculator Calculator

Oscillator Frequency Drift Estimator Estimator

Buck Output Inductor Ripple Calculator Calculator

Parity Bit Calculator Calculator

PCB Stackup Impedance Planner Calculator

PCB Thermal Via Array Calculator Calculator

PCB Trace Width Calculator Calculator

Peukert's Law Runtime Tool

Phase Noise → Jitter Calculator Calculator

RC Phase Shift Calculator Calculator

Photodiode Sensitivity / TIA Calculator Calculator

Pi / T Attenuator Calculator Calculator

Pierce Crystal Oscillator Calculator Calculator

PLL Loop Filter Calculator Calculator

Power Calculator Calculator

Power Factor Calculator Calculator

Power Factor Correction Calculator Calculator

Power Supply Filter Capacitor Calculator Calculator

Propagation Delay (RC) Tool

PWM Duty Cycle Tool

PWM Frequency Calculator Calculator

PWM to Voltage Calculator Calculator

Q Factor Calculator Calculator

Quantization Noise Power Tool

Quantization Error Calculator Calculator

Radar Range Equation Calculator Calculator

RC Filter Cutoff Tool

RC Rise/Fall Time Tool

RC Time Constant Calculator Calculator

Receiver Sensitivity Calculator Calculator

Rectifier DC Output Calculator Calculator

Resistor Color Code Reference

Resistor Power Dissipation Tool

Return Loss Calculator Calculator

Ripple Voltage Calculator Calculator

RL Filter Calculator Calculator

RMS Calculator Calculator

RS-485 Bias & Termination Calculator Calculator

Sallen-Key High-Pass Filter Calculator Calculator

Sallen-Key Low-Pass Filter Calculator Calculator

Schmitt Trigger Threshold Helper Tool

Oscilloscope Bandwidth - Rise Time Tool

SEPIC Converter Calculator Calculator

Serpentine Length-Match Calculator Calculator

Setup & Hold Time Margin Tool

Short-Circuit Current Calculator Calculator

SINAD ↔ ENOB Calculator Calculator

Single-Phase Power Calculator Calculator

Skin Depth Calculator Calculator

SMPS Efficiency Estimator Estimator

Signal-to-Noise Ratio (SNR) Calculator Calculator

Solar Panel Sizing Tool Tool

SPI Timing Budget Calculator Calculator

Sound Pressure Level (SPL) Tool

State-Variable Filter (KHN) Calculator Calculator

Stripline Trace Impedance Calculator Calculator

Supercapacitor Energy Tool

SWR Calculator Calculator

Temperature Coefficient Calculator Calculator

Total Harmonic Distortion (THD) Tool

Thermal Resistance Chain Tool

Thermistor Resistance vs Temperature Tool

Thermocouple Reference Calculator Calculator

Thevenin / Norton Converter Calculator

Transformer Turns Ratio (Dedicated Tool) Tool

Transformer Inrush Current Calculator Calculator

Transformer Turns Ratio Calculator Calculator

Transistor Base Resistor Tool

Truth Table & Boolean Logic Solver Calculator

Twin-T Passive Notch Calculator Calculator

Two's Complement Calculator Calculator

UPS Runtime Calculator Calculator

USB Connector Types Chart Reference

USB Power Delivery Profiles Calculator Calculator

Signal Wavelength in Cable Tool

PCB Via Inductance Calculator Calculator

Video & Display Connector Chart Reference

Voltage Divider Calculator

Voltage Drop Calculator Calculator

Voltage Unbalance Calculator Calculator

Wheatstone Bridge Calculator Calculator

Wien Bridge Oscillator Calculator Calculator

Wire Gauge Reference Reference

Transformer Efficiency Tool

Zener Diode Biasing Tool

Core electronics formulas

The relationships most of these tools are built on.

Quantity	Formula	Units
Voltage	`V = I × R`	volts (V)
Current	`I = V ÷ R`	amperes (A)
Resistance	`R = V ÷ I`	ohms (Ω)
Power	`P = V × I`	watts (W)
LED resistor	`R = (V_s − V_f) ÷ I`	ohms (Ω)
RC time constant	`τ = R × C`	seconds (s)

Always size a resistor’s wattage above its calculated dissipation (P = I²R) — a common cause of burnt parts.

Text & Encoding

Encoders, decoders, hashing, formatters, and string tools.

Unit converters, base converters, calculators, and math utilities.

Image, audio, video tools and file inspection utilities.

A universal color converter, pickers, palette generators, contrast checkers, and gradient builders.

JSON/XML formatters, URL tools, regex testers, and HTTP utilities.

Learn to program from zero to advanced — pick a language and your level, then step through code, run it live, and work through guided lessons.