# Watts to kWh & kWh to Watts Calculator

Watts to kWh and kWh to Watts calculators helps in finding out the energy consumption of a particular appliance or load when its power and time of use is given. Energy consumption helps in finding out the electricity cost generated due to an appliance.

**Choose What to Calculate**

**E**

_{(kWh)}_{(W)}x

_{(hr)}1000

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**Choose What to Calculate**

**P**

_{(W)}_{(kWh)}t

_{(hr)}

## What is kWh?

Kilowatts hour (kWh) is the unit used to express energy consumption of appliance or load.

## What is Energy?

Energy is defined as the product of power and time. For constant value it is expressed as:

*energy*= power * time

For power expressed as a function of time, energy is expressed as:

*Energy =*Σ power(t) * tk

*Energy =*∫ power(t) * dt

**Here,**

- tf=final time
- ti= initial time
- tk= time at a given instant

it can be concluded that energy is the sum of the product of power and time.

## Watts to kWh & kWh to Watts calculator parameter:

**Choose what to calculate:**Watts to kWh & kWh to Watts**if Watts to kWh selected:**power in watts**If kWh to Watts selected:**energy in kilowatt-hours**time:**in hours

## Converting Watts to kWh:

A general step for converting Watts to kWh is given as:

Step1: converting Watts to W-hr, by multiplying Watts with time (in hours). The quantity achieve is known as watts-hour (W-hr).

Step2: dividing W-hr by 1000 to get the required kWh.

**Energy (E) =**

## Converting kWh to Watts:

A general step for converting kWh to Watts is given as:

Step1: converting kWh to W-hr, by dividing Watts by time (in hours).

Step2: converting W-hr to Watts, by dividing W-hr by time (in hours).

**Power(P) =**

## Solved Example:

**Watts to kWh conversion:**

Consider the following data:

**Given:**

Power= 300 Watts

Time=3hr

**Required:**

Energy (E)=? (kWh)

**Solution:**

From Watts to kWh conversion formula:

*Energy (E)*=**=0.9 kWh**

**kWh to Watts conversion:**

Consider the following data:

**Given: **

Energy (E)= 2 kWh

Time=2 hr

**Required: **

Power=? (Watts)

**Solution: **

From kWh to Watts conversion formula:

*P*=**= 1000 Watts**