Category
Electronics & PCB Design
Electronics, board layout, analog fundamentals, power systems, impedance, and thermal design calculators.
Single-Phase Power Calculator
Calculate apparent, real, and reactive power for a single-phase AC load from voltage, current, and power factor.
Electrical Energy Cost Calculator
Estimate daily, monthly, and annual electricity use and cost from load power, runtime, and utility rate.
Series and Parallel Resistance Calculator
Combine three resistor values in series or parallel and compare branch current under a chosen source voltage.
Battery Charging Time Calculator
Estimate ideal charging time and input energy from battery capacity, charge current, efficiency, and nominal voltage.
Solar Panel Output Calculator
Estimate daily and monthly solar energy from panel wattage, panel count, peak-sun hours, and system derating.
Wire Gauge Voltage Drop Calculator
Estimate round-trip DC voltage drop for common copper AWG sizes from load current, run length, and source voltage.
Three-Phase Power Calculator
Calculate real power, apparent power, reactive power, and phase current for a balanced three-phase load.
Power Factor Correction Calculator
Estimate capacitor kvar and capacitance needed to raise a load from an existing power factor to a target power factor.
RC Time Constant Calculator
Calculate RC time constant, common settling times, and cutoff frequency from resistance and capacitance.
RL Time Constant Calculator
Calculate RL time constant, current-rise milestones, and equivalent cutoff frequency from inductance and resistance.
RLC Damping Ratio Calculator
Calculate natural frequency, damping ratio, Q factor, and damping classification for a series RLC circuit.
Capacitive Reactance Calculator
Calculate capacitor reactance, impedance magnitude, and AC current at a selected frequency.
Inductive Reactance Calculator
Calculate inductor reactance, impedance magnitude, and AC current at a selected frequency.
Fuse / Breaker Sizing Calculator
Estimate a protective device size from continuous load current, design multiplier, and derating factor.
Resistor Power Dissipation Calculator
Estimate resistor current, power, energy, and a practical wattage margin from voltage and resistance.
Capacitor Energy Calculator
Calculate stored energy, charge, RC time constant, and discharge time for a capacitor.
PCB Trace Width Calculator
Estimate external trace width from current and copper weight.
555 Timer Astable Circuit Configurator
Input R1, R2, and C to calculate frequency and duty cycle.
Voltage Divider Calculator
Find resistor values for a target output voltage.
LED Series Resistor Calculator
Size current-limiting resistors for LEDs.
Op-Amp Gain Calculator
Calculate inverting, non-inverting, and differential gain.
Passive Filter Designer
Design RC, RL, and LC low-pass or high-pass cutoffs.
Inductor Color Code Calculator
Decode inductor markings into inductance values.
Decibel to Voltage/Power Converter
Convert dB relationships into voltage and power ratios.
Wheatstone Bridge Calculator
Solve bridge balance and unknown resistance values.
Star-Delta Transformation Tool
Convert Y and delta resistor networks.
Skin Depth Calculator
Estimate conductor skin depth at high frequency.
Microstrip Impedance Calculator
Estimate controlled impedance for PCB traces.
Battery Life Calculator
Estimate runtime from capacity and average current draw.
Transformer Turns Ratio & Efficiency Calculator
Relate winding ratio, voltage, current, and losses.
Zener Diode Voltage Regulator Designer
Size simple shunt regulator components.
Series/Parallel Impedance Solver
Solve complex impedance networks.
Via Current Capacity Calculator
Estimate current handling for plated vias.
Differential Pair Impedance Tool
Size high-speed differential traces.
Buck/Boost Converter Component Finder
Choose approximate switching-regulator components.
Unit Converters
Convert mils, millimeters, copper ounces, and microns.
Thermal Resistance/Heatsink Sizing Tool
Estimate junction temperature and heatsink requirements.