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.
EquipmentQuantityRunning WattsHours/day Watt Hours/day
Kitchen Appliances
Coffee Pot (10 Cup)
Coffee Pot (4 Cup)
Home Appliances
Clothes Washer
Clothes Dryer
Fan (3-speed, 12in.)
Hair Dryer
Space Heater
Water Heater
*Well Pump (1/2 HP)
*Sump Pump (1/2 HP)
*Air Conditioner 7,000-10,000 BTU
Home Electronics
TV (32in.)
DVD player
Clock Radio
Computer (Desktop w/ Monitor)
Computer (Laptop)
Game Console
Light Bulb
Light Bulb (Compact)
1/4in. Drill
3/8in. Drill
1/2in. Drill
Jig Saw
Band Saw
Table Saw
6 1/2in. Circular Saw
7 1/4in. Circular Saw
8 1/4in. Circular Saw
Disc Sander
Other EquipmentQuantityRunning WattsHours/day Watt Hours/day
Enter your own
ResetCalculate Load
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
Reliance Amwatt Appliance Load Tester
  • 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?
  • How does solar energy work?
  • What are the benefits of solar energy?
  • How do I generate my own solar energy?
Solar Power Equipment
  • 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?
Power Inverters