Computers & Laptops

Multi-Monitor Power Calculator

Add up the power of a multi-monitor setup, each display on its own row.

19 inputs Free, no sign-up

Your figures

Name each display and enter its wattage from its own label. Leave a row blank to skip it.

Add some if you are sizing a UPS or an extension board for the desk.

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

Three or four displays add up to more than people expect. A desk with an ultrawide and two portrait panels can draw more than the computer driving them, and it all comes off the same socket.

Enter each display separately, because they are rarely the same model.

How to use this calculator

  1. Enter each display's wattage from its own label.
  2. Set how many of that model you have if there are several the same.
  3. Leave unused rows blank. Nothing is assumed for an empty row, and a row you clear stays clear.
  4. Add headroom only if you are sizing a UPS or a power board for the desk.

The formula

Total = sum of (each display's power x how many)
SymbolMeaningUnit
Display power From each label W
Quantity How many the same

Worked example

A 45 W ultrawide and two 24 W portrait panels:

45 + 24 x 2 = 93 W

Which over eight hours a day is about 0.74 kWh, or roughly ₹180 a month at ₹8 a unit.

Notes and limits

  • Monitors are a steady load rather than a spiky one, which makes them easy to plan around and easy to underestimate over a year.
  • A graphics card driving several high-refresh displays uses more power than one driving a single screen, even at idle. That is on the computer's side of the total.
  • A desk on one UPS has to fit inside both the unit's VA and watt ratings. The UPS capacity calculator takes this total.
  • If the displays are powered through a laptop's USB-C dock, some of this load passes through the laptop's charger, which has its own ceiling.

What this calculation assumes

  • Every wattage is one you entered.
  • Label figures are treated as running draw, which brightness changes.

Frequently asked questions

How much power does a three-monitor setup use?

Add up the labels. A typical three-panel desk lands somewhere between 60 W and 150 W depending on size and brightness, which is why the figures have to come from your own displays.

Do more monitors make the PC use more power too?

Yes, a little. A graphics card driving several displays runs its memory at a higher clock even at idle, and that shows up as a few extra watts on the computer.

Can a UPS run my monitors as well?

Adding them to the load is exactly the right thing to check. Take this total, add the computer, and size the UPS against both its VA and watt ratings.

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