Electrical Calculators
Calculate Ohm's Law, wire size, electrical loads, panel sizing, motor amperage and solar systems instantly with our free online electrical calculators.
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64 calculators available
🌟 Most Searched Electrical Calculators
Ohm's Law Calculator
Calculate voltage, current or resistance using Ohm's Law.
FeaturedWire Size Calculator
Determine the right wire gauge for your circuit's amperage and length.
FeaturedElectrical Load Calculator
Calculate the total electrical load for a home or circuit.
FeaturedSolar Panel Sizing Calculator
Calculate the number of solar panels needed for your energy usage.
⭐ Popular Electrical Calculators
8+ CalculatorsOhm's Law Calculator
Calculate voltage, current or resistance using Ohm's Law.
Wire Size Calculator
Determine the right wire gauge for your circuit's amperage and length.
Electrical Load Calculator
Calculate the total electrical load for a home or circuit.
Solar Panel Sizing Calculator
Calculate the number of solar panels needed for your energy usage.
Voltage Drop Calculator
Calculate voltage drop across a wire run.
Watts to Amps Calculator
Convert power in watts to current in amps.
Panel Load Calculator
Calculate the total load on an electrical panel.
Motor Full Load Amps Calculator
Calculate the full load amperage of an electric motor.
⚡ Circuit Fundamentals
10+ CalculatorsOhm's Law Calculator
Calculate voltage, current or resistance using Ohm's Law.
Series Circuit Calculator
Calculate total resistance, current and voltage in a series circuit.
Parallel Circuit Calculator
Calculate total resistance and current in a parallel circuit.
Voltage Divider Calculator
Calculate output voltage from a resistor voltage divider.
Current Divider Calculator
Calculate current split between parallel branches.
Kirchhoff's Voltage Law Calculator
Verify voltage balance around a closed circuit loop.
Kirchhoff's Current Law Calculator
Verify current balance at a circuit node.
Impedance Calculator
Calculate total impedance in an AC circuit.
Power Factor Calculator
Calculate the power factor of an AC electrical circuit.
Three-Phase Power Calculator
Calculate power in a three-phase electrical system.
🔌 Wiring & Cable Sizing
9+ CalculatorsWire Size Calculator
Determine the right wire gauge for your circuit's amperage and length.
Voltage Drop Calculator
Calculate voltage drop across a wire run.
Conduit Fill Calculator
Calculate the maximum number of wires allowed in a conduit.
Wire Ampacity Calculator
Calculate the maximum safe current-carrying capacity of a wire.
Circuit Breaker Size Calculator
Calculate the right circuit breaker size for a load.
Ground Wire Size Calculator
Determine the correct ground wire size for a circuit.
Cable Length Calculator
Estimate the maximum cable run length before voltage loss.
Wire Resistance Calculator
Calculate the resistance of a wire from length and gauge.
Extension Cord Wire Gauge Calculator
Determine the right gauge for an extension cord run.
🔢 Power & Load Calculations
9+ CalculatorsElectrical Load Calculator
Calculate the total electrical load for a home or circuit.
Watts to Amps Calculator
Convert power in watts to current in amps.
Amps to Watts Calculator
Convert current in amps to power in watts.
kWh Usage Calculator
Calculate energy usage in kilowatt-hours for an appliance.
Power Consumption Cost Calculator
Estimate the electricity cost of running a device.
Power Triangle Calculator
Calculate real, reactive and apparent power in an AC circuit.
Apparent Power Calculator
Calculate apparent power in volt-amps for an AC load.
Reactive Power Calculator
Calculate reactive power in an AC electrical system.
Energy Consumption Calculator
Calculate total energy consumption across multiple devices.
🏠 Residential & Panel Electrical
9+ CalculatorsPanel Load Calculator
Calculate the total load on an electrical panel.
Circuit Breaker Panel Sizing Calculator
Determine the right amperage rating for a breaker panel.
Outlet Circuit Calculator
Calculate how many outlets a circuit can safely support.
Lighting Circuit Load Calculator
Calculate the total load on a lighting circuit.
Service Entrance Size Calculator
Calculate the right service entrance size for a home.
Sub-Panel Sizing Calculator
Calculate the right amperage for an electrical sub-panel.
GFCI Circuit Calculator
Calculate GFCI protection requirements for a circuit.
Home Electrical Load Calculator
Calculate total electrical load for an entire household.
Whole House Generator Sizing Calculator
Calculate the generator size needed to power your home.
⚙️ Motors & Industrial Electrical
9+ CalculatorsMotor Full Load Amps Calculator
Calculate the full load amperage of an electric motor.
Motor Starting Current Calculator
Calculate the inrush current when starting an electric motor.
Transformer Sizing Calculator
Calculate the right transformer size (kVA) for a load.
Three-Phase Motor Calculator
Calculate current and power for a three-phase motor.
Motor Horsepower Calculator
Calculate motor horsepower from voltage, current and efficiency.
VFD Sizing Calculator
Calculate the right variable frequency drive size for a motor.
Capacitor Bank Sizing Calculator
Calculate capacitor bank size needed for power factor correction.
Short Circuit Current Calculator
Estimate available short circuit current at a point in a system.
Arc Flash Calculator
Estimate arc flash incident energy for electrical safety.
☀️ Renewable & Battery Systems
10+ CalculatorsSolar Panel Sizing Calculator
Calculate the number of solar panels needed for your energy usage.
Battery Bank Sizing Calculator
Calculate the battery bank size needed for backup power.
Solar Inverter Sizing Calculator
Calculate the right inverter size for a solar power system.
Battery Runtime Calculator
Estimate how long a battery will power a given load.
Solar Charge Controller Calculator
Calculate the right charge controller size for a solar array.
Off-Grid System Calculator
Size a complete off-grid solar and battery power system.
Battery Capacity Calculator
Calculate battery capacity in amp-hours or watt-hours.
EV Charging Circuit Calculator
Calculate the right circuit size for an EV charger.
Solar Panel Wire Size Calculator
Calculate the right wire size for a solar panel installation.
Generator Fuel Consumption Calculator
Estimate fuel consumption for a backup generator.
Why Use Our Electrical Calculators?
Whether you're an electrician, a homeowner or a solar installer, our electrical calculators provide fast, accurate and reliable results in seconds.
Instant Results
Get accurate electrical calculations without manual math.
High Accuracy
Reliable formulas grounded in standard electrical code practices.
Mobile Friendly
Use every calculator smoothly on desktop, tablet and mobile.
Completely Free
Unlimited calculations with no registration required.
How to Use an Electrical Calculator
Follow these simple steps for quick and accurate results.
Choose Calculator
Select the electrical calculator you need from the category list.
Enter Circuit Values
Type in voltage, current, wire length or load values.
Select Conditions
Choose wire type, phase or ambient conditions where relevant.
Get Result
Instantly view your calculated electrical result.
Quick Electrical Facts
A few concepts our calculators are built around.
Ohm's Law
Voltage equals current multiplied by resistance (V = I × R), the foundation of circuit analysis.
Standard Household Voltage
Most U.S. homes run on 120V for outlets and 240V for larger appliances.
Wire Ampacity
Thicker wire (lower gauge number) can safely carry more current over longer distances.
Solar Sizing
Solar array size depends on daily energy usage, panel wattage and available sunlight hours.
Common Uses of Electrical Calculators
⚡ Circuit Analysis
Calculate voltage, current, resistance and power factor.
🔌 Wiring Design
Size wires, conduit and breakers for a safe installation.
🏠 Residential Panels
Calculate panel, sub-panel and service entrance sizing.
⚙️ Motors & Industrial
Size motors, transformers and short circuit protection.
☀️ Solar & Battery
Size solar arrays, inverters and battery backup systems.
🔢 Power & Energy
Convert watts, amps and kWh to estimate energy costs.
Frequently Asked Questions
Answers to the most common questions about electrical calculators.
What is an electrical calculator?
An electrical calculator solves for a circuit or power value such as voltage, current, wire size or load using standard electrical formulas based on the values you provide.
Are these electrical calculators accurate?
Yes. Our calculators use standard electrical formulas and code-based guidelines to provide reliable estimates. Always verify critical wiring and safety work with a licensed electrician and local code requirements.
Can I use these calculators on mobile devices?
Absolutely. Every calculator is fully responsive and works smoothly on smartphones, tablets and desktop computers.
Are these electrical tools free?
Yes. All electrical calculators on Calculations.one are completely free to use without registration.
Which electrical calculator categories are available?
We offer calculators for circuit fundamentals, wiring and cable sizing, power and load calculations, residential and panel electrical, motors and industrial electrical, and renewable and battery systems.
How often are new electrical calculators added?
We regularly expand our collection by adding new electrical calculators and improving existing tools.
Calculate With Confidence
Explore our growing collection of professional electrical calculators designed for electricians, homeowners and solar installers.