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Basic Calculators
5 tools
Popular
Ohm's Law Calculator
Solve for V, I, R, or P — all 12 power formulas in one tool.
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Popular
LED Resistor Calculator
Find the correct current-limiting resistor for any LED circuit.
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Voltage Divider Calculator
Calculate output voltage for any two-resistor voltage divider.
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Power Calculator
Calculate electrical power using P=VI, P=I²R, or P=V²/R.
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Series/Parallel Resistor
Calculate total resistance for series and parallel networks.
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Passive Components
7 tools
Popular
Resistor Color Code
Decode 4-band and 5-band resistor color codes instantly.
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SMD Resistor Calculator
Decode 3-digit, 4-digit, and EIA-96 SMD resistor codes.
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Capacitor Code Calculator
Decode and encode 3-digit capacitor codes (pF, nF, µF).
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Capacitor Charge Calculator
RC time constant, charging voltage, energy, and charge (Q=CV).
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Wire Gauge Calculator
Convert AWG ↔ mm² ↔ diameter and find ampacity ratings.
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Wire Resistance Calculator
Calculate resistance of copper, aluminum, and other wire materials.
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Battery Life Calculator
Estimate runtime from capacity (mAh), current draw, and efficiency.
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AC Analysis
7 tools
RLC Impedance Calculator
Series and parallel RLC impedance, phase angle, Q factor.
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Resonance Frequency
LC resonance frequency using Thomson's formula f=1/(2π√LC).
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AC Power Calculator
Real, reactive, apparent power and power factor with triangle diagram.
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New
Filter Designer
RC/RL low-pass and high-pass filter cutoff frequency calculator.
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New
Complex Impedance
Convert rectangular ↔ polar, combine series/parallel impedances.
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dB Calculator
Convert ratios ↔ dB, calculate gain, dBm, dBW, and dBV.
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Semiconductors
5 tools
Popular
555 Timer Calculator
Astable oscillator frequency, duty cycle, and monostable pulse width.
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Popular
Op-Amp Calculator
Gain and Vout for inverting, non-inverting, summing, and difference amps.
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Zener Regulator
Series resistor, zener current, and power for shunt voltage regulators.
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BJT Switch Calculator
Base resistor and saturation check for NPN/PNP transistor switches.
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LM317 Regulator
Calculate R1/R2 for any LM317 output voltage from 1.25V to 37V.
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Digital Logic
3 tools
New
Number Systems Converter
Convert binary, hex, octal, decimal. Bitwise AND, OR, XOR, NOT operations.
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New
Logic Gate Simulator
Toggle inputs live and see AND, OR, NOT, NAND, NOR, XOR gate outputs.
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New
Gate Sandbox
Enter any Boolean expression and generate its complete truth table and canonical forms.
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Circuit Lab
2 tools
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