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Resistor Calculators
Decode color codes, combine values, and check power ratings for discrete resistors.
4-Band Resistor Color Code 5-Band Resistor Color Code 6-Band Resistor Color Code SMD Resistor Decoder Resistor Series Calculator Resistor Parallel Calculator Resistor Power Rating Calculator Open calculators
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Capacitor Calculators
Read capacitor codes, combine capacitances, and work with reactance and RC timing.
Capacitor Code Calculator Parallel Capacitors Calculator Series Capacitors Calculator Capacitive Reactance Calculator RC Time Constant Calculator Capacitor Charging Calculator Capacitor Discharging Calculator Open calculators
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Inductor Calculators
Inductor codes, series/parallel combinations, reactance, time constants and coil design.
Inductor Color Code Calculator Inductor Series Calculator Parallel Inductors Calculator Inductive Reactance Calculator RL Time Constant Calculator Solenoid Inductance Calculator Toroid Inductance Calculator Open calculators
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Ohm's Law & Power
The fundamental DC relationships — voltage, current, resistance, power and logarithmic units.
Ohm's Law Calculator Electrical Power Calculator Voltage Divider Calculator Wattage to dBm Converter Wattage to dBu Converter Resistance Combiner (Series & Parallel) Resistor Power Dissipation Calculator Open calculators
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Frequency & Filters
Cutoffs, resonance, reactance, wavelength and active filter design.
RC Low-Pass Cutoff RL Low-Pass Cutoff LC Tank Resonant Frequency Period ↔ Frequency Resonant Frequency Wavelength Calculator Sallen-Key Active Filter Design Capacitive Reactance Inductive Reactance Bandwidth Calculator LC Band-Pass Calculator Open calculators
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Audio & Impedance
Decibels, matching, transmission lines, SPL, speaker loads and pads.
Decibel Calculator Impedance Matching Transmission Line Impedance Audio Power → SPL Speaker Impedance Audio Attenuator Audio Matching (Max Power) Open calculators
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Battery & Energy
Runtime, series/parallel packs, capacity & energy conversions, charging and solar.
Battery Life Estimator Battery Series Battery Parallel Ah ↔ mAh Converter Wh ↔ kWh ↔ Joules Charging Time Calculator Solar Panel → Battery Charger Watt-hour Calculator Open calculators
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Transformer Calculators
Turns ratio, voltage, power, impedance matching, VA/watts and ratings.
Turns Ratio Voltage Transformer Transformer Power Impedance Transformer VA ↔ Watts Converter Transformer VA Rating Primary/Secondary Voltage Open calculators
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LED & Circuit Design
LED resistors, 555 timers, series strings, arrays, current limiting and op-amp drivers.
LED Resistor Calculator 555 Timer — Astable 555 Timer — Monostable LED Series Resistor LED Array Calculator Current Limiter Op-Amp Gain — LED Driver Open calculators
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Power Supply & Rectifier
Half-wave & full-wave rectification, smoothing ripple, and regulator dropout.
Half-Wave Rectifier Output Full-Wave Rectifier Output Ripple Voltage (incl. capacitor sizing) Voltage Regulator Dropout Open calculators
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Motor & Generator
DC motor speed/torque, induction slip, generator power and efficiency.
DC Motor Speed/Torque Induction Motor Slip Generator Power Output Generator Efficiency Open calculators
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Transistor & Amplifier
BJT/MOSFET biasing, amplifier gain, and frequency response.
BJT Biasing MOSFET Biasing Amplifier Gain Frequency Response Open calculators
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Op-Amp Calculators
Inverting/non-inverting gain, integrators, differentiators, and bandwidth.
Inverting Amplifier Gain Non-Inverting Amplifier Gain Integrator Output Differentiator Output Bandwidth Analysis Open calculators
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Passive Filter & Impedance
Low-pass, high-pass, band-pass filters and complex impedance calculations.
Low-Pass Filter High-Pass Filter Band-Pass Filter Impedance Calculator Open calculators
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RF & Antenna
Wavelength, dipole sizing, Yagi spacing, and antenna gain conversions.
Wavelength/Frequency Conversion Half-Wave Dipole Length Yagi-Uda Element Spacing Antenna Gain Conversions Open calculators
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Semiconductor Calculators
BJT biasing, MOSFET gate drive, diode characteristics, and zener regulation.
BJT Biasing (Voltage Divider) MOSFET Gate Drive Diode Forward Voltage Zener Regulator Design Open calculators
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Universal Unit Conversions
30+ categories: electrical, mechanical, thermal, data, astronomy, cooking, and more.
Voltage Current Resistance Capacitance Inductance Power Frequency Temperature Length Area Volume Mass AWG Wire Size dBm ↔ Watt RPM ↔ Frequency Metric ↔ Imperial Open converters