Electronics And Circuits calculators
51 calculators Ohm's Law Calculator Enter any two of voltage, current, resistance or power and solve the other two with Ohm's Law. Unit prefixes (mV, kV, mA, kohm), full work shown, plus running cost.
Open Parallel Resistor Calculator Find the equivalent resistance of resistors in parallel, switch Ω, kΩ or MΩ units, reverse-solve a missing resistor, and get total current and power from a voltage.
Open Resistor Color Code Calculator (4, 5 & 6 Band) Decode 4, 5 and 6 band resistor color codes to ohms, tolerance and temperature coefficient. Reverse mode finds the bands for any value, with the allowed range.
Open Resonant Frequency Calculator (LC and RLC) Find LC resonant frequency with f = 1 / (2π√LC), or reverse solve for L or C. Add resistance for Q factor, bandwidth, reactance and impedance, with full steps.
Open Series Resistor Calculator Add resistors in series to get total resistance in Ω, kΩ or MΩ, plus loop current, the voltage drop and power dissipated by each resistor, and a tolerance band.
Open Wire Gauge Calculator Size copper or aluminum wire for DC, single-phase or three-phase circuits. Get the AWG for a target voltage drop, or check the drop of a chosen gauge.
Open 555 Timer Calculator Calculate 555 timer frequency, period, duty cycle, and pulse width for astable and monostable modes. Instant results with step-by-step formulas for NE555 circuits.
Open Breaker Size Calculator Find the correct circuit breaker size for DC, single-phase, or three-phase loads. Applies the NEC 125% rule for motors, AC units, and general loads. Free online tool.
Open Bridge Rectifier Calculator Calculate DC output voltage, ripple voltage, peak inverse voltage, filter capacitor, efficiency and transformer VA for a full-wave bridge rectifier.
Open Capacitor Calculator Calculate capacitor charge, stored energy, RC time constant, capacitive reactance, and series or parallel equivalent capacitance. Instant results with worked steps.
Open Capacitor Charge Time Calculator: RC Time Constant and Voltage Calculate capacitor charge time for any RC circuit. Get the time constant, voltage at any point, stored energy, and a charge curve chart. Formula shown step by step.
Open Capacitor Energy Calculator Calculate energy stored in a capacitor from capacitance and voltage. Supports pF to F, mV to kV, nJ to kWh, with reverse-solve and step-by-step working.
Open Capacitor Size Calculator Calculate the capacitor size you need for energy storage, power factor correction, or motor start/run applications. Covers reactance and charge outputs.
Open Speaker Crossover Calculator Calculate passive crossover capacitor and inductor values for 2-way and 3-way speaker networks. Supports 1st-4th order Butterworth, Linkwitz-Riley, and Bessel filters.
Open Current Divider Calculator Calculate branch currents in a parallel circuit (2-4 branches). Covers resistive, inductive, and capacitive dividers with step-by-step working and a current breakdown.
Open Dipole Antenna Calculator Calculate dipole antenna length in feet and metres for any frequency. Includes adjustment factor, inverted-vee mode, feedpoint impedance, and HF band reference table.
Open Generator Power Calculator Calculate generator power in kW, kVA, amps, volts, and horsepower for single-phase, three-phase, and DC systems. Includes power factor and motor efficiency.
Open Helical Coil Calculator Calculate helical coil inductance, height, wire length, resistance, magnetic field, stored energy, and resonant frequency. Metric and imperial, with step-by-step math.
Open High Pass Filter Calculator Calculate the cutoff frequency of any passive high-pass filter (RC, RL or LC) in seconds. Get phase shift, gain in dB, roll-off slope and a Bode plot - free online.
Open Ideal Transformer Calculator Calculate turns ratio, primary and secondary voltage, current, reflected impedance, and power for an ideal transformer. Six solve modes with step-by-step math.
Open Inductor Energy Storage Calculator Calculate the energy stored in an inductor instantly. Enter inductance and current to get energy in joules, millijoules, or microjoules. Reverse-solve for L or I.
Open Inductors in Parallel Calculator Calculate the equivalent inductance of inductors wired in parallel. Supports up to 8 inductors, four unit scales, inductive reactance, and step-by-step working.
Open Inductors in Series Calculator Calculate total inductance of inductors in series instantly. Supports H, mH, uH, nH units, up to 8 inductors, reverse-solve, energy stored, and step-by-step math.
Open J-Pole Antenna Calculator Calculate J-pole antenna dimensions: radiator, stub, feedpoint height, stub impedance, and SWR bandwidth. Metric or imperial, any VHF/UHF frequency.
Open LED Resistor Calculator Calculate the current-limiting resistor for LEDs in series or parallel. Get exact ohms, nearest E12/E24 value, power dissipation, and wattage rating instantly.
Open Low Pass Filter Calculator Calculate the cutoff frequency, time constant, phase shift and attenuation of RC, RL, LC and op-amp low-pass filters. Step-by-step solution and Bode chart included.
Open Magnetic Force Between Current-Carrying Wires Calculator Calculate the magnetic force per unit length and total force between two parallel current-carrying wires. Shows attraction vs. repulsion, unit switches, steps, and a chart.
Open Magnetic Force on a Current-Carrying Wire Calculator Calculate the magnetic force on a current-carrying wire using F = BIL sin(theta). Input field, current, length, and angle to get the Lorentz force in Newtons.
Open MOSFET Calculator Calculate MOSFET drain current, transconductance, and power dissipation for N-channel and P-channel devices. Auto-detects cut-off, triode, and saturation regions.
Open MOSFET Threshold Voltage Calculator Calculate MOSFET threshold voltage (Vth) from oxide thickness, substrate doping, flatband voltage, body bias, and temperature, with full derivation and body effect.
Open Noise Figure Calculator Calculate noise figure from SNR, noise factor, or cascaded stages using the Friis formula. Get NF in dB, noise temperature, and a step-by-step breakdown.
Open Parallel Capacitor Calculator: Total Capacitance in Parallel Circuits Calculate total capacitance for up to 10 capacitors in parallel. Supports pF, nF, uF, mF, and F. Shows the formula, step-by-step working, and a per-capacitor breakdown.
Open Photon Detection Efficiency Calculator (SiPM) Calculate SiPM photon detection efficiency (PDE) from quantum efficiency, fill factor, and triggering probability, or back-calculate PDE from measured responsivity.
Open RC Circuit Calculator Calculate RC circuit time constant, cutoff frequency, capacitive reactance, impedance, phase shift, and voltage at any time t. Series and parallel modes included.
Open Resistor Noise Calculator Calculate thermal (Johnson-Nyquist) noise voltage, spectral density, noise power and noise level for any resistor. Instant results with worked steps and a noise chart.
Open Resistor Wattage Calculator Calculate the power dissipated by a resistor from any two of voltage, current, and resistance. Get a safe wattage rating with 50 % derating and a power curve chart.
Open RLC Circuit Calculator Calculate resonant frequency, impedance, Q factor, damping ratio, bandwidth and phase angle for series and parallel RLC circuits instantly.
Open RLC Impedance Calculator Calculate RLC circuit impedance, phase angle, resonant frequency, Q factor, and bandwidth for series and parallel circuits. Instant step-by-step results.
Open RMS Voltage Calculator Convert peak voltage, peak-to-peak voltage, or average voltage to RMS for six waveform types including sine, square, triangle, sawtooth, and rectified waves.
Open Shockley Diode Calculator Calculate diode current or forward voltage using the Shockley equation. Supports real diodes (n=1-2), temperature input, thermal voltage, and I-V curve output.
Open Solenoid Inductance Calculator Calculate solenoid inductance, stored energy, magnetic field strength, and inductive reactance. Supports air and iron cores, metric and imperial units.
Open Solenoid Magnetic Field Calculator Calculate the magnetic field inside a solenoid from current, turns, and length. Supports core materials, unit switches, reverse-solve, and a field-vs-current chart.
Open Spherical Capacitor Calculator Calculate the capacitance, stored energy, electric field and voltage of a spherical capacitor. Supports dielectric materials and reverse-solve modes.
Open Three-Phase Power Calculator Calculate three-phase apparent, real, and reactive power for balanced Wye or Delta systems. Enter voltage, current, and power factor to get S, P, and Q instantly.
Open Transformer Sizing Calculator Size a single-phase or three-phase transformer from load kW, power factor, and voltages to get required kVA, primary/secondary amps, turns ratio, and a standard rating.
Open Transistor Biasing Calculator Transistor biasing calculator for NPN BJTs: Q-point (Ic, Vce), voltage gain, input impedance, and thermal stability factor across four common biasing topologies.
Open Voltage Divider Calculator Voltage divider calculator: solve for output voltage, input voltage, R1 or R2. Includes load resistance, current, power dissipation, and step-by-step math.
Open Voltage Regulation Calculator Calculate voltage regulation (%) from no-load and full-load voltages, or use the impedance method for transformers. Covers step-up and step-down formulas with worked steps.
Open Wheatstone Bridge Calculator Calculate unknown resistance or output voltage of a Wheatstone bridge. Balanced and unbalanced modes with step-by-step working, Req, current, and sensitivity (mV/V).
Open Wire Resistance Calculator Calculate wire resistance, voltage drop, and power loss for any material and gauge. Includes temperature correction, AWG selector, and worked steps.
Open Wire Size Calculator Find the right wire gauge (AWG) for any circuit. Enter current, voltage, length, and material to get the minimum wire size, actual voltage drop, and resistance.
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