Computers & Laptops

Monitor Power Calculator

Total power for your monitors, from the wattage on their own labels.

7 inputs Free, no sign-up

Your figures

The wattage is on the label on the back, in the manual, or on the energy label. Typical use is usually quoted separately from maximum.

Usually none is wanted here - a monitor is a fixed load. Leave it at zero for the plain total.

Try an example

Result

Your result

Enter your figures and the result appears here.

Estimates only. Rates, fees and specifications change. Confirm against the official source before you rely on a figure — see our disclaimer.

About this calculator

A monitor's power is on its own label and nowhere else useful. Panels of the same size differ by a factor of three or four depending on backlight, brightness and whether it is an office display or a high-brightness one, so a figure invented for "a 24-inch monitor" would be wrong for most of them.

How to use this calculator

  1. Find the wattage on the label on the back of the monitor, in the manual, or on its energy label. Use the typical figure rather than the maximum where both are given.
  2. Enter it and how many of that monitor you have.
  3. Add a second row if your monitors are different models.

The formula

Total power = sum of (each monitor's power x how many)
SymbolMeaningUnit
Monitor power From the monitor's label W
Quantity How many of that model

Worked example

Two 28 W monitors and one 45 W ultrawide:

28 x 2 + 45 = 101 W

Notes and limits

  • Brightness is the largest single variable. A panel at 100% brightness can use twice what it uses at 30%, and the label figure is usually measured somewhere in between.
  • Energy labels quote power in a standardised mode. Real use with HDR content or high brightness is above it.
  • A monitor in standby still draws a little, typically under a watt on a modern panel.
  • For the cost rather than the load, use the monitor electricity cost calculator.

What this calculation assumes

  • Every wattage is one you entered. No monitor data is stored in this page.
  • The label figure is treated as the running draw, which brightness and content both change.

Frequently asked questions

How many watts does a monitor use?

Anywhere from about 15 W for a small efficient panel to over 100 W for a large high-brightness one. The figure for yours is on its label, which is why this page asks for it rather than assuming.

Does screen brightness change power use?

Considerably. The backlight is most of a monitor's consumption, so running at full brightness can use roughly twice what a comfortable indoor setting does.

Should I use the typical or the maximum figure?

Typical, for working out normal consumption. Maximum is the right figure when you are sizing a supply or a UPS that has to cover the worst case.

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