Watt Hours to Watts (Wh to W) Conversion Calculator


Watts Results:

Wh / hrs =

0.00 W

Conversion formula: W = Wh / hrs

What Is Watt-Hour (Wh)?

Watt-hour (Wh) is a measure of electrical energy. It represents the total energy usage or output when a given amount of power is used or produced for a certain number of hours.

For example, when a device consumes 1 W for 1 hour, it would have used one watt-hour (1 Wh) of energy. Then when a battery generates 2 W for 2 hours, it would have generated 4 Wh of energy.

Watt-hour is not an SI unit. However, it is typically used interchangeably with kilowatt-hour (kWh) as the unit of electrical energy.

What Is Watt (W)?

Watt units represent power consumption or generation. When it comes to electricity, watt is a measure of how much energy is moving through a circuit per unit time.

Watt is the SI unit of power. So, it is typically used in all measurements involving power.

How to Calculate Watt Hours of an Appliance

Calculating the watt-hours of an appliance is pretty straightforward, especially if you know the appliance’s power consumption and how long it consumed said power. When you know those two values, all you have to do is multiply them to get the watt-hours of the appliance.

So, for instance, if your solar attic fan consumes 25 watts for 2 hours, its energy consumption in watt-hours would be:

solar attic fan energy usage in Wh = 25 x 2 = 50 Wh

But then, what if the power consumption is not known and instead we know the volt, current, and time?

If we know the voltage and current/amperage at which the appliance was working, we can simply calculate its wattage by multiplying the voltage and current.

Then when we know the wattage/power consumption, we can multiply it with the time to get the watt-hours.

So, if we have a solar refrigerator running on a 24v battery voltage for 2 hours and drawing 2 amps, its energy consumption would be:

= volt x amp x hour = 24 x 2 x 2 = 96Wh

Why Calculate Watt Hours?

Calculating watt-hours gives you an idea of your devices’ energy usage. With this knowledge, you can estimate your total energy consumption and forecast how much you’ll spend on electricity bills.

Besides being a way to forecast your electricity bills, knowing your devices’ watt-hours can help you reduce your electricity bills. Once you calculate each device’s watt-hours, you can readily tell which devices consume more energy.

Of course, you may then replace such energy-intensive devices with energy-saving alternatives, limit their usage, or stop using them altogether.

If you are working with a power source that has a limited capacity, you have to calculate watt-hours to ensure you do not overload said source.

For instance, if you have a battery whose battery capacity is 200Wh, you must ensure that the total watt-hours of all devices connected to it does not exceed 200Wh. If it does, the devices will overwhelm the battery.

How to Convert Watt Hours (Wh) to Watts (W)

Converting watt-hours to watts is straightforward when you know how long the device/appliance ran for. All you have to do is divide the value of watt-hours by how long the device ran for (in hours).

Watt-hour to Watts Calculation Formula

Here’s the formula to convert watt-hours to watts:

watts = watt-hour ÷ time (hour)

So, if we have a solar refrigerator that consumes 200Wh of energy in 5 hours, what would be its average wattage?

Using the watt-hour to watts calculation formula, the average wattage of the refrigerator would be:

= 200 ÷ 5 = 40 W

Difference Between Watts (W) and Watt-Hour (Wh)

The primary difference between watts and watt-hour is that they represent different quantities. While watt-hour represents energy consumption, watt units represent power consumption.

What Is Kilowatt-Hour?

At its simplest, kilowatt-hour is watt-hour with the metric prefix – kilo. It is the energy used by an appliance/device that consumes a certain amount of power (in kilowatts) for one hour.

For example, if a device consumes 1 kW for 1 hour, it would have used up 1 kWh of energy. If it uses 2 kW for 3 hours, the energy consumption would be 6 kWh.

How to Convert Watts to Kilowatt-Hours (W to kWh)

To convert watts to kilowatt-hour:

  • divide the value of watts by 1000 to convert it to kilowatts
  • next, multiply the kilowatts by time (in hour)

Here’s the formula:

kilowatt-hour = (watt x hour) ÷ 1000

So, if a solar refrigerator uses 40 watts for 8 hours, it would have consumed:

= (40 x 8) ÷ 1000 = 320 ÷ 1000 = 0.32 kWh

How to Convert Watt-Hour (Wh) to Kilowatt-Hours (kWh)

To convert watt-hour to kilowatt-hours, simply divide by 1000. In other words, 1000 watt-hour in kilowatt-hours would be:

= 1000/1000 = 1 kWh

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