Electrician Training Electrical Certification wiring recessed light fixtures Electrical Wiring Electrical Troubleshooting and Electrical Repairs wire outdoor light fixture Home Electrical Wiring Diagrams

wiring home generator and transfer switch wiring a 220 volt range cord outlet Wiring for GFCI Outlets Wiring Outlets and a Switched Outlet Wiring and Installing Ceiling Fans and Remote Controls wire dimmer switch wiring diagrams for switches wiring a dryer cord and 220 outlet circuit breaker panel
Electrical Wire and Cable
ask the electrician
Electrician Training Electrical Certification wiring recessed light fixtures Electrical Wiring Electrical Troubleshooting and Electrical Repairs wire outdoor light fixture Home Electrical Wiring Diagrams
wiring home generator and transfer switch wiring a 220 volt range cord outlet Wiring for GFCI Outlets Wiring Outlets and a Switched Outlet How to Installing and Wire Ceiling Fans and Remote Controls wire dimmer switch wiring diagrams for switches wiring a dryer cord and 220 outlet circuit breaker panel
Electrical Wire and Cable

Electrical Load Calculation

Online Interactive Residential Electrical Load Calculator


residential-electrical-panel-calculations Summary: Residential Electrical Load Calculator, Online and Interactive provides accurate panel load calculations.


Check Out What Others Are Sharing at Ask the Electrician:
I like the idea of getting electrical help online, because hiring an electric can be very expensive. Luis from Jackson, Tennessee


Quick Start Guide for the Electrical Load Calculator
Let's get started. Advanced
Experienced Electricians
No explanation needed.
Review the basics. Intermediate
Inspectors and Teachers
Short Explanations to help you get started.
Please explain the process. Novice
Homeowners and Students
Detailed explanations to help you get it right.

Please Note: This online calculating tool requires javascript to be turned on in your browser.

Detailed Instructions for the Electrical Load Calculator.

Introduction to the Electrical Load calculator

The purpose of the residential electrical load calculation is to accurately determine the size of the electrical service base upon the electrical equipment that will be installed. The national electrical codes are the basis of making sure the electrical service is sized properly and installed correctly.

Step 1

The General Electrical Load Requirements are based on the inside square feet area of the home which is then used to calculate the basic lighting load and required appliance circuits. The Residential Electrical Load Calculator is Pre-Loaded with electrical information for you to chose from. Click on the Question Mark Buttons for more specific information relating to each section and entry.

Step 2

Appliances and Motor Type Loads are typically larger equipment used in the kitchen, laundry room, garage. Be sure to check the nameplate information for accurate calculations.

Step 3

Heating and Air Conditioning. Properly Identifying Heating and Air Conditioning Equipment is very important because the equipment typically requires a larger electrical load.

Step 4

Perform the Calculations: The Calculate button will perform calculations from the information you have provided in this form. The Calculate Button Must Be Pressed when any changes are made to the form.

The Basics of How Electrical Power is Measured and Calculated

What is VA?

VA is the abbreviation for volt-ampere, which is a unit of power that is determined by multiplying the voltage and the amperage current in a circuit. VA is a standard measurement of electrical power that is used for identifying electrical circuit component requirements.
Example: a 120 volt circuit which is providing 1 ampere = 120 volt-amperes.

The Difference Between VA and Watts?

A watt is a measure of true power which is required to perform work at the rate of 1 joule per second. The wattage is calculated by multiplying voltage times the power factor of the circuit.
Example: Watts = Voltage times the Amperage times the Power Factor.

What is Power Factor?

PF or Power Factor is the ratio of the actual power in watts to the apparent power in volt-amperes which is expressed as a percentage.
Example: 100% power factor is the best , however a typical power factor could range between 75 to 90%.

SPECIAL NOTE:
In some areas of the form below you can combine VA loads for multiple equipment with the specified section.





Brief Instructions for the Electrical Load Calculator

The load calculator is divided into three main sections which enable you to enter the necessary information about the home project and the proposed electrical equipment that will be installed.

The calculations conform to the national electrical codes which focus on required loads and factoring in the appliance and motor equipment. The question mark help buttons will assist you with detailed information about typical equipment loads which may be selected in the various drop down menus.

This Residential Electrical Load Calculator is Pre-Loaded with electrical information for you to chose from. Please use additional Question Mark Buttons for more specific information. For your continuance the Update and Calculate Buttons will Recalculate the entire form.




Residential Electrical Load Calculator for the Main Service

Minimum Size of the Electrical Service - 2017 NEC Article 220.82

Step #1 - General Electrical Load Requirements Quantity Load Elect. Code & Information
Indoor Sq. Ft. Area of the Home
Small Appliance Circuits 1500VA Ea.
Laundry Circuit 1500VA Ea.
Sec. #1 Sub-Total =

Step #2 - Appliance & Motor Loads VA  
Dryer
Oven
Cook top Stove or Range
Water Heater
Dishwasher
Disposal
Additional Appliance(s), Including EV Chargers
Sec. #2 Sub-Total =
First 10,000 VA @ 100% =
Adjustment 40% of Remainder =

Step #3 - Heating & Air Conditioning VA  
Single Source Heating Unit  
OR Air Conditioning and Heating Unit
OR Heat Pump - No Supplemental Heat
OR Continuous Electric Thermal Storage
Heating Unit with Supplemental Heat Source  
OR Heat Pump
Sup. Elect Heat OR Central Elect.Heat
OR Space Heaters VA
How Many Space Heaters
Sec. #3 Sub-Total =

Step #4 - Perform the Calculations  
Calculated Total VA Load =
Calculated Total Amps Load =
Reset the Form

© Copyright Dave Rongey Ask-The-Electrician.com

Click to Print This Page

More Electrical Calculations and Formulas:

electrical load calculator va formula Generator Sizing Calculator
Voltage Drop Calculator
Ohms Law Formula
Electrical Wire and Cable Selection
Codes for Electrical Service Panels
Electrical Codes for Grounding
Electrical Codes for Underground
Electrical Projects Guidelines
Did this help you? Send me your Feedback, Suggestions, or Requests

IMPORTANT: We provide these calculating tools as a guide to assist you to understand the process of accurately sizing a residential electrical panel based on proposed loads. The results of the calculations are based upon the accuracy of the information that you provide. The [Calculate] Button must be pressed when any changes are made to the form. Accurate load sizing is best performed by a professional architect or engineer which is reviewed by the building department in your jurisdiction.


Home Electrical Wiring

Wire a GFCI Outlet without a Ground Wire

Helping You Wire it Right



» You Can Avoid Costly Mistakes! «

Here is How to Do It:
Wire It Right with the help of my Illustrated Wiring Book

Great for any Home Wiring Project.


  electrical wiring  

Complete Guide to Home Electrical Wiring

Perfect for Homeowners, Students,
Handyman, Handywomen, and Electricians
Includes:
Wiring GFCI Outlets
Wiring Home Electric Circuits
120 Volt and 240 Volt Outlet Circuits
Wiring Light Switches
Wiring 3-Wire and 4-Wire Electric Range
Wiring 3-Wire and 4-Wire Dryer Cord and Dryer Outlet
How to Troubleshoot and Repair Electrical Wiring
Wiring Methods for Upgrading Electrical Wiring
NEC Codes for Home Electrical Wiring
....and much more.


« Grounding and Home Electrical Wiring Electrical Apprenticeship 1 »


RELATED

More about Residential electrical load calculation

How to Install an Electrical Sub Panel
Thinking about installing a Sub Panel? Here is what must be considered first, and you may find that you really do not need a sub panel at all.

Wire Size for a Home Electrical Service Panel
How to Size Wire for an Electrical Service Panel: What kind of wires do I need to get power to my home?

Is Your Electric Service Panel Big Enough
Is my electric panel big enough for all my appliances? Estimating the Required Electrical Service, Home Electrical Panel Sizes, Circuit Breaker Spaces in Electric Panels.

How to Install Wire for an Outbuilding
Installing Electrical Wiring for an Outbuilding: How to Size and Calculate an Electric Panel for an Outbuilding, Online Electrical Load Calculator and Voltage Drop Calculator.

Circuit Wiring for a House
What is required for the electrical circuit wiring in a residential home? How to Plan the Home Electrical Circuits, Installing Electrical Wiring for Light Fixtures and Outlets, Home Electrical Wiring.

Electrical Circuit Wiring for an RV
What gauge wire do I need to run for an outdoor sub panel? How to Install Electrical Wiring that Provides Power to an RV Unit.

Sizing A Main Electrical Panel For A Home
What size main panel should I install for my home electrical circuits? How to Size a Main Electrical Service Panel for a Home.

Understanding Electrical Panel Sizes
Electrical Circuit Breakers and Panels: My panel has a lot of circuit breakers, why doesn't the main breaker trip when everything is on at the same time?

residential electrical load calculation - 1495