Wattage Calculator

Use this wattage calculator to determine your energy needs for power inverters, electrical power generation or off-the-grid solar and wind power-generating systems.

Average Daily Loads for Common Appliances and Tools

Add the total watts from each piece of equipment you may want to run/start at the same time. The wattage requirements below are estimates. The actual wattage required for your appliances may vary from what's listed. Check your appliances for actual wattage required.
* These appliances may require 3 to 7 times the listed wattage when starting.
Equipment Quantity Running Watts Hours/day   Watt Hours/day
Kitchen Appliances
Home Appliances
Home Electronics
Lighting
Tools
Other Equipment Quantity Running Watts Hours/day   Watt Hours/day
Enter your own
Reset Calculate Load
TOTAL WATTS REQUIRED
 
 

What's the watt/Amp usage on my appliances?

Simple plug-in tester gives quick, accurate digital readouts of watt or amp usage. Use for refrigerators, dehumidifiers, space heaters, microwaves, holiday lighting, coffeemakers, hair dryers and more. Essential for calculating power needs for home transfer switches and emergency generator needs.
Add plug-in tester to my cart
More Info
Reliance Amwatt Appliance Load Tester

Generators Buyer's Guide

  • What type of generator do I need?
  • How many watts will my generator produce?
  • What type of fuel will I need to run my generator?
  • How much noise will my generator produce?
Shop Generators
Generators

Solar Power Equipment Buyer's Guide

  • How does solar energy work?
  • What are the benefits of solar energy?
  • How do I generate my own solar energy?
Shop Solar Solutions
Solar Power Equipment

Power Inverters Buyer's Guide

  • What are typical uses for a power inverter?
  • Do I need an inverter or a generator?
  • How do I choose the right size inverter?
  • Do I need a true or modified sine wave inverter?
Shop Power Inverters
Power Inverters