How Many Watts Does It Take To Run Your House?

Calculating your household energy consumption is essential if you’re looking for ways to save on electricity costs or build a home backup power system.

It’s much easier than it sounds. Calculating how many watts it takes to run your house requires simple calculations and an analysis of your past electricity bills.

Once you dive in, you may be surprised to learn how much electricity you and your family consume on a daily or monthly basis. 

So how many watts does your house need to run? 

Find out how to calculate your current energy consumption and how it compares to the average household.  

How Many Watts Does an Average Home Use?

The average UK household consumes around 8.5 kWh of electricity daily for an entire day’s activities: cooking meals, watching television, doing laundry, running the dishwasher, etc. 

It also accounts for the appliances that run in the background, like your lighting, refrigerator, heater, and air conditioner.

Energy costs and usage vary widely across regions. 

Which Factors Influence How Many Watts Are Needed to Run a House?

Multiple factors can impact overall energy consumption even with households that use similar appliances.

Here are the primary factors determining how many watts you’ll need to run your house:

The Size of Your House

The home’s square footage significantly impacts electricity consumption. 

The more rooms your home has, the more electricity your house requires to heat and cool. 

There will also be more lights and potentially more people using the appliances in a larger home. 

Your House’s Age and Condition

Older homes built before the widespread adoption of energy-efficient appliances and building materials use more energy than newer homes. 

Newer homes are more energy efficient, with better insulation, more efficient HVAC systems, and Energy Star-rated appliances.

Size of Your Household

This may seem obvious, but the more people living in a household, the higher the energy consumption.

Consider the following: 

  • The more people taking hot showers and baths, the more electricity your water heater consumes 
  • Major appliances like dishwashers, washing machines, and refrigerators will be used more often
  • Lighting and HVAC requirements will increase 

Where You Live

Your home’s location plays a significant role in energy consumption. 

If you live in a hot climate, air conditioning may be an everyday necessity during the summer — or year-round. 

Likewise, people in freezing climates must keep their heating systems running to survive. 

Local energy rates also can influence electricity consumption. Residents with higher energy costs tend to be more careful about how much energy they use. 

The Number and Type of Appliances

The more large appliances in a household, the higher energy consumption. For instance, a dryer uses much more power than hanging clothes outside to dry. A dishwasher will always use more electricity than washing your dishes by hand.

Older appliances also tend to consume more power. New appliances are usually Energy Star-rated and consume much less electricity. 

How Often You Use Electrical Appliances (Lifestyle)

Your family’s lifestyle and appliance usage will significantly affect the wattage required to run your home. 

For example, how hot or cold you keep your home will influence energy consumption. 

You’ll consume more power if you prefer to keep your home toasty in winter or frosty in the summer.

How much time your household spends using televisions, computers, and washing machines will also impact your energy consumption. 

Hourly electricity consumption tends to vary throughout the day, with on-peak hours for most households falling between 7:00 AM-11:00 PM during the week.

Average Home Energy Consumption and Backup Power

The energy consumption of home appliances varies widely based on specific models and usage patterns. 

Suppose you’re considering purchasing a portable power station or whole home backup power solution to provide energy security for your family when a blackout strikes. In that case, you need to calculate the electricity requirements of the essential appliances you want to run.

Here’s how.

​​​​Determining Your Wattage Requirements

Before using a generator, you will want to determine how much power you need.

  1. Identify the wattage requirements of your appliances. Survey the starting and running wattage requirements of the appliances and devices you plan to plug into the generator. You can usually find the wattage requirements labelled on the appliance, but we’ve also compiled the starting and running watts of typical household appliances in the table below. 
  2. Convert volts/amps to watts. If your appliance’s power requirements are in volts or amps, you can calculate an appliance’s running watts with this equation: 

Volts (V) x Amps (A) = ​​Watts (W)  

  1. Count the running watts of your appliances. Add up the running watts of the appliances you plan to use — does the total exceed the running watts listed on your generator? If so, you should consider buying a generator with more output capacity.
  2. Factor in starting watt requirements. Identify the appliance with the highest starting wattage. Add that appliance’s starting wattage to the running wattage total.
  3. Calculate the sum. That final number is the total starting watts you need from your generator.  As discussed above, to avoid overloading your generator, do not exceed its starting watts rating.

Starting and Running Watts of Typical Household Appliances 

ApplianceRated (Running) WattsStarting Watts
Washing Machine12002300
Light Bulb60-750
Coffee Maker10000
Clothing Iron15000
Toaster Oven12000
Curling Iron15000
Space Heater20000
20” Box Fan200350

Frequently Asked Questions

Is 9000 Watts Enough to Power a House?

A backup power source or generator that outputs 7,000 – 9,000 watts of electricity is sufficient to power an entire home during a blackout. It’s crucial to keep in mind that you need the ability to store or generate electricity during a blackout. For example, 3.6kWh of storage or generation capacity might see you through a day of average household electricity consumption. For more extended outages, you’ll need to add additional battery storage or solar/fossil-fuel electricity generation capacity.    

Final Thoughts

By calculating your household’s energy consumption, you can take informed steps to reduce your electricity bills. 

You’ll also be armed with sufficient knowledge to make an intelligent purchase decision to back up your home’s electricity supply or generate enough power to meet your family’s needs.

If you’re looking for power backup and generation solutions, check out EcoFlow.

Whether you’re looking for emergency backup power or complete energy independence, there’s an EcoFlow solution that’s right for you.

EcoFlow is a portable power and renewable energy solutions company. Since its founding in 2017, EcoFlow has provided peace-of-mind power to customers in over 85 markets through its DELTA and RIVER product lines of portable power stations and eco-friendly accessories.


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