Enter the length, width, and height of a room into the calculator to determine the estimated wattage needed to heat the room.

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## Watt Heat Formula

The following formula is used to estimate the wattage (power) needed to heat a room.

W = L*W*H * 1.25

- Where W is the wattage required to heat a room (Watts)
- L is the length of the room (ft)
- W is the width of the room (ft)
- H is the heigh of the room (ft)

This formula is a simple estimation, and the true power required to heat a room depends drastically on the insulation properties of the room.

## Watt Heat Definition

A watt of heat is the standard unit of measure of heat transfer and is defined as one joule of energy per second of time.

## Example Problem

How to calculate watt heat?

**First, determine the length of the room.**In this example, the room is measured to have a length of 20ft.

**Next, determine the width of the room.**The width of the room is measured to be 10ft.

**Next, determine the height of the room.**The room has a standard height of 8ft.

**Finally, calculate the watt heat.**Using the formula above, the watts required to heat the room are estimated to be:

W = L*W*H * 1.25

W = 20*10*8 * 1.25

W = 2000 watts.