Electricity Calculator

  • Dipole Antenna Calculator
    Calculate the total and per-leg length of a half-wave dipole antenna from frequency in MHz, in meters and feet. Free, instant, accurate.
  • Current Divider Calculator
    Calculate the current through each resistor in a parallel current divider. Enter total current and two resistor values to get I through R1 and R2.
  • Capacitor Charge Time Calculator
    Calculate capacitor charging voltage over time in an RC circuit. Enter supply voltage, resistance, capacitance and time to get V(t) and time constant Ļ„.
  • Capacitor Energy Calculator
    Calculate the energy stored in a capacitor from its capacitance and voltage using E = Ā½ Ɨ C Ɨ VĀ². Also shows stored charge Q = C Ɨ V.
  • Watts to Lux Calculator
    Convert watts to lux using luminous efficacy and lit area. Enter power (W), efficacy (lm/W) and area (mĀ²) to get illuminance in lux instantly.
  • Skin Depth Calculator
    Calculate the skin depth of a conductor from frequency, conductivity, and permeability. Find how deep AC current penetrates in copper, aluminum and more.
  • Watts to Amps Calculator
    Convert watts to amps for DC and single-phase AC circuits. Enter power, voltage and power factor to get current in amps instantly.
  • Volt to Electron Volt Calculator
    Convert volts to electron volts instantly. Enter the voltage and charge (in elementary charges) to find energy in eV and joules with this free V to eV calculator.
  • Power Dissipation Calculator
    Calculate power dissipated in a resistor using P = IĀ²R. Enter current in amperes and resistance in ohms to get power in watts instantly.
  • Internal Resistance Calculator
    Calculate a battery or cell's internal resistance from its EMF, terminal voltage, and current using r = (EMF āˆ’ V) / I. Free, instant, accurate.
  • Faraday's Law Calculator
    Calculate the induced EMF in a coil using Faraday's law of electromagnetic induction from the number of turns, change in magnetic flux, and time.
  • Inductive Reactance Calculator
    Calculate inductive reactance (XL) in ohms from frequency and inductance using XL = 2Ļ€fL. Fast, accurate AC circuit calculator for engineers.
  • Electrical Power Calculator
    Calculate electrical power in watts from voltage, current and resistance. Uses P=VƗI, P=IĀ²Ć—R and P=VĀ²/R. Enter any two values to find power.
  • Drift Velocity Calculator
    Calculate the drift velocity of charge carriers from current, carrier density, cross-sectional area, and charge using vd = I / (nĀ·AĀ·q).
  • Cutoff Frequency Calculator
    Calculate the -3dB cutoff frequency of an RC filter from resistance and capacitance using fc = 1 / (2Ļ€RC). Free online tool.
  • Capacitive Reactance Calculator
    Calculate capacitive reactance (Xc) in ohms from frequency and capacitance using Xc = 1 / (2Ļ€ f C). Fast, accurate AC circuit tool.
  • CCF to Therms Calculator
    Convert natural gas usage from CCF (hundred cubic feet) to therms using the standard 1.037 thermal factor. Free, instant, and adjustable.
  • Conductivity to Resistivity Calculator
    Convert electrical conductivity (S/m) to resistivity (Ī©Ā·m) instantly using Ļ = 1/Ļƒ. Free online physics calculator with formula and worked example.
  • Capacitance Calculator
    Calculate capacitance from charge and voltage using C = Q / V. Get results in farads and microfarads instantly with this free online tool.
  • LED Light Resistor Calculator
    Enter supply voltage, LED forward voltage, and forward current to compute the required series resistor value for safe LED operation in your circuit.
  • Buck Converter Calculator
    Calculate buck (step-down) converter output voltage from input voltage and duty cycle, plus inductor ripple current and recommended inductance.
  • Ohm's Law Calculator
    Enter any two valuesā€”voltage (V), current (A), resistance (Ī©), or power (W)ā€”to compute the others instantly and check basic circuit values.
  • Wheatstone Bridge Calculator
    Calculate the unknown resistance Rx of a balanced Wheatstone bridge from R1, R2 and R3 using Rx = R2 Ɨ R3 / R1. Free, instant, accurate.
  • Voltage Regulation Calculator
    Calculate voltage regulation (VR%) of transformers and power lines from no-load and full-load voltages. Free, instant percent regulation tool.

Categories