Electrical Calculators
Browse our comprehensive collection of electrical calculators for Ohm's law, power, voltage, current, resistance, wire size, energy consumption, circuit analysis, and more. Free online tools for electricians, engineers, and students.
Ohm's Law Calculator
Calculate voltage, current, resistance, or power using Ohm's law (V = I × R) with formula steps.
ohms-lawVoltage Calculator
Calculate voltage (V) from current and resistance using Ohm's law with detailed formula.
ohms-lawCurrent Calculator
Calculate current (I) from voltage and resistance with step-by-step Ohm's law.
ohms-lawResistance Calculator
Calculate resistance (R) from voltage and current with Ohm's law formula.
ohms-lawPower Calculator (P = V × I)
Calculate electrical power from voltage and current with step-by-step formula.
ohms-lawResistor Color Code Calculator
Decode resistor values from color bands with 4-band, 5-band, and 6-band support.
ohms-lawSeries & Parallel Resistance
Calculate total resistance for series and parallel resistor circuits.
ohms-lawConductance Calculator
Calculate conductance (S) from resistance with detailed formula and units.
ohms-lawPower Consumption Calculator
Calculate electrical power consumption and cost for appliances and equipment.
powerEnergy Cost Calculator
Calculate electricity cost based on power consumption, time, and rate per kWh.
powerkWh to Joules Converter
Convert kilowatt-hours (kWh) to joules (J) for energy calculations.
powerWatt to Horsepower Converter
Convert watts (W) to horsepower (HP) for mechanical power equivalence.
powerBTU to kWh Converter
Convert British Thermal Units (BTU) to kilowatt-hours (kWh).
powerAppliance Energy Calculator
Calculate annual energy consumption and cost for household appliances.
powerLED vs Incandescent Savings
Compare energy savings and cost between LED and incandescent bulbs.
powerAppliance Wattage Estimator
Estimate wattage of common household appliances from typical values.
powerVoltage Drop Calculator
Calculate voltage drop in electrical circuits with wire size, length, and current.
voltageAC Voltage Calculator
Calculate AC voltage parameters (peak, RMS, average) for sinusoidal waveforms.
voltageDC Voltage Calculator
Calculate DC voltage, current, and resistance for DC circuits.
voltageCurrent Density Calculator
Calculate current density (A/m²) in conductors with cross-sectional area.
voltageRMS to Peak Converter
Convert RMS voltage to peak voltage and vice versa for AC signals.
voltageLine-to-Line Voltage Calculator
Calculate line-to-line voltage from phase voltage in three-phase systems.
voltagePhase Voltage Calculator
Calculate phase voltage from line-to-line voltage in three-phase systems.
voltageVoltage Divider Calculator
Calculate output voltage for resistor divider circuits with step-by-step formula.
voltageResistor Color Code Calculator
Identify resistor values from color bands (4-band, 5-band, 6-band) with tolerance.
resistanceSeries Resistance Calculator
Calculate total resistance for resistors connected in series with details.
resistanceParallel Resistance Calculator
Calculate total resistance for resistors connected in parallel with formula.
resistanceConductivity Calculator
Calculate electrical conductivity (σ) from resistance and dimensions.
resistanceResistivity Calculator
Calculate material resistivity (ρ) from resistance, length, and area.
resistanceTemperature Coefficient Calculator
Calculate resistance change with temperature using temperature coefficient.
resistanceSMD Resistor Code Calculator
Decode SMD resistor values from 3-digit, 4-digit, and EIA-96 codes.
resistanceLight Dependent Resistor (LDR) Calc
Calculate resistance change for LDR based on light intensity.
resistanceWire Size Calculator
Calculate minimum wire size (AWG) based on current, voltage, and distance.
wireAWG to mm² Converter
Convert American Wire Gauge (AWG) to square millimeters (mm²) and vice versa.
wireVoltage Drop Calculator
Calculate voltage drop for wire runs with NEC code compliance.
wireWire Resistance Calculator
Calculate wire resistance based on material, length, and gauge.
wireWire Ampacity Calculator
Calculate current-carrying capacity (ampacity) of wires based on NEC tables.
wireCable Sizing Calculator
Calculate cable size for electrical installations with current and distance.
wireBusbar Current Calculator
Calculate current-carrying capacity of copper or aluminum busbars.
wireWire Weight Calculator
Calculate wire weight based on material, gauge, and length.
wireRC Time Constant Calculator
Calculate RC time constant (τ = R × C) for resistor-capacitor circuits.
circuitRL Time Constant Calculator
Calculate RL time constant (τ = L / R) for resistor-inductor circuits.
circuitLC Resonant Frequency Calculator
Calculate LC resonant frequency for inductor-capacitor circuits.
circuitPower Factor Calculator
Calculate power factor, apparent power, real power, and reactive power.
circuitImpedance Calculator
Calculate impedance for series and parallel RLC circuits.
circuitCapacitance Calculator
Calculate capacitance (C) from charge and voltage or plate dimensions.
circuitInductance Calculator
Calculate inductance (L) from voltage, current, and time or coil dimensions.
circuitSeries vs Parallel Circuit Calculator
Compare series and parallel circuits with total resistance and power calculations.
circuitMotor Power Calculator
Calculate motor power (HP) from voltage, current, efficiency, and power factor.
motorMotor Torque Calculator
Calculate motor torque (lb-ft or N-m) from power and RPM.
motorGenerator Power Calculator
Calculate generator output power from voltage, current, and power factor.
motorMotor Efficiency Calculator
Calculate motor efficiency from input power and output power.
motorMotor Starting Current Calculator
Calculate motor inrush current and starting characteristics.
motorMotor Speed Calculator
Calculate motor RPM from frequency and number of poles (synchronous speed).
motorGenerator Fuel Consumption
Calculate generator fuel consumption and runtime based on load and efficiency.
motorMotor Sizing Calculator
Size electric motors for pumps, fans, conveyors, and other applications.
motorCircuit Breaker Sizing
Calculate circuit breaker size based on load current and NEC standards.
safetyFuse Sizing Calculator
Calculate fuse rating based on load current and type of application.
safetyShort Circuit Current Calculator
Calculate available short-circuit current in electrical systems.
safetyGrounding Electrode Calculator
Calculate grounding electrode resistance for safety systems.
safetyLightning Arrester Calculator
Calculate lightning arrester requirements for building protection.
safetyNEC Load Calculation
Calculate electrical load for residential and commercial buildings per NEC.
safetyArc Flash Calculator
Calculate incident energy and arc flash boundary for electrical safety.
safetyElectrical Safety Compliance
Check compliance with electrical safety standards and requirements.
safetyWhat Are Electrical Calculators?
Our Electrical Calculators collection provides essential tools for electricians, electrical engineers, students, and anyone working with electrical systems. Whether you need to calculate Ohm's law, size wires, analyze circuits, estimate energy costs, or ensure safety compliance, these calculators deliver accurate results with clear explanations.
From voltage and current calculations and wire sizing to circuit analysis, motor sizing, and safety compliance, our tools cover the full spectrum of electrical engineering needs.
How to Use This Directory
- Search: Type a keyword into the search bar to find specific calculators by name or description.
- Filter by Category: Use the dropdown to narrow down to a specific electrical topic — each option shows the number of calculators available.
- Click to Use: Each card links directly to the tool. Click on any card to start your electrical calculation instantly.
- Explore Category Pages: Use the "Explore All Electrical Calculator Categories" section to access dedicated pages with even more tools.
Why Use Our Electrical Calculators?
- Comprehensive Coverage: Covers Ohm's law, power, energy, voltage, current, resistance, wire sizing, circuit analysis, motors, generators, and safety standards.
- Accurate & Reliable: Uses industry-standard formulas and NEC code references.
- Free & Accessible: No registration, no fees — use any tool instantly on any device.
- Educational: Many tools show formula steps and explain the underlying principles.
- Professional & DIY Friendly: Designed for both professionals and home enthusiasts.
❓ Electrical Calculators FAQ
What types of electrical calculations can I perform?
You can perform Ohm's law calculations (voltage, current, resistance, power), wire sizing and voltage drop calculations, circuit analysis (RC, RL, LC), power and energy consumption calculations, motor and generator sizing, and safety compliance calculations.
How do I use the Ohm's Law Calculator?
Enter any two values (voltage, current, resistance, or power) and the calculator will compute the remaining values using Ohm's law (V = I × R) and power formulas (P = V × I).
How do I calculate voltage drop?
Use our Voltage Drop Calculator. Enter the current, wire length, wire gauge, and material. The calculator will compute the voltage drop and check compliance with NEC standards.
How do I determine the right wire size?
Use our Wire Size Calculator. Enter the load current, voltage, wire length, and installation conditions. The calculator will recommend the minimum AWG wire size per NEC standards.
How do I calculate electrical energy consumption?
Use our Power Consumption Calculator or Energy Cost Calculator. Enter the appliance wattage and usage time to calculate energy consumption in kWh and estimated cost.
What is the difference between AC and DC circuits?
DC (direct current) flows in one direction with constant voltage. AC (alternating current) reverses direction periodically. Our calculators handle both types with appropriate formulas.
How do I calculate power factor?
Use our Power Factor Calculator. Enter the real power (kW) and apparent power (kVA) or voltage, current, and phase angle to compute the power factor.
How do I size a circuit breaker?
Use our Circuit Breaker Sizing calculator. Enter the load current and application type to determine the correct breaker size based on NEC guidelines.
Are these calculators compliant with NEC standards?
Yes, our calculators reference NEC (National Electrical Code) standards where applicable for wire sizing, voltage drop, circuit breaker sizing, and electrical safety.
How often are new electrical calculators added?
We regularly add new calculators based on user requests and industry needs. If you have a suggestion, please contact us.