Energy Monitoring Dashboard Calculator

Calculate your energy monitoring dashboard metrics by entering your device's power (watts), hours used per day, and electricity rate. Get back daily, monthly, and yearly kWh consumption along with the full cost breakdown for any device or appliance. Add multiple devices to understand your total energy footprint and spot where savings are possible.

Optional — name the device you are measuring.

W

Enter your device's wattage. Average monitor wattage is 84W. Check the label on the back of your device if unsure.

hrs

How many hours per day do you run this device? Use decimals for partial hours (e.g. 0.5 for 30 min).

days

How many days per week is this device in use?

How many identical devices do you have running?

$/kWh

Average US residential rate is $0.1045/kWh. Check your utility bill for your exact rate.

W

Power consumed when the device is on standby but not in active use. Leave at 0 if not applicable.

Results

Yearly Energy Cost

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Daily Usage

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Monthly Usage

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Yearly Usage

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Daily Cost

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Monthly Cost

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Standby Cost (Yearly)

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Active Use Cost (Yearly)

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Yearly Energy Cost Breakdown

Results Table

Frequently Asked Questions

How many watts does a monitor use?

The average computer monitor uses around 84 watts during active use, though this varies significantly by size and type. LED monitors tend to be more efficient (20–60W), while older CRT monitors can consume 60–150W. Check the label on the back of your specific monitor for the exact wattage.

How do I calculate my device's energy usage in kWh?

Multiply the device's wattage by the number of hours used per day, then divide by 1000 to convert watts to kilowatt-hours (kWh). For example, an 84W monitor running 8 hours a day uses 84 × 8 / 1000 = 0.672 kWh per day. Multiply by 30 for monthly usage or by 365 for yearly usage.

What is the average electricity rate in the United States?

The average residential electricity rate in the United States is approximately $0.1045 per kWh, though this varies widely by state and utility provider. States like Hawaii and California have rates above $0.20/kWh, while states in the South and Midwest can be as low as $0.08/kWh. Always check your utility bill for your exact rate.

What is standby power and why does it matter?

Standby power (also called vampire power or idle power) is the electricity a device consumes while plugged in but not actively in use. Most electronics draw 1–5 watts on standby. While small per device, standby consumption across all devices in a home can account for 5–10% of total electricity use and add meaningfully to your annual bill.

How can I reduce my monitor or device energy costs?

Enable power-saving and sleep modes so the device dims or powers off after a period of inactivity. Use a smart power strip to eliminate standby draw completely. Opt for energy-efficient monitors with ENERGY STAR certification, and reduce brightness settings — even a 30% reduction in brightness can cut screen energy use noticeably.

How do I find the wattage of my device if it is not listed?

Check the label on the back or bottom of the device, which typically lists voltage (V) and current (A). Multiply these two numbers to get approximate wattage (W = V × A). Alternatively, use a plug-in energy monitor (such as a Kill A Watt meter) to measure actual real-time consumption, which is often more accurate than the rated label.

Does running multiple monitors or devices significantly increase my bill?

Yes — the number of devices multiplies your total consumption linearly. Two 84W monitors running 8 hours a day consume twice the energy of one. This calculator lets you set the number of identical devices so you can see the combined impact on your monthly and yearly electricity costs.

What is a kilowatt-hour (kWh)?

A kilowatt-hour is the standard unit of energy used by utility companies for billing. One kWh equals 1,000 watts of power consumed for one hour. For example, a 100W light bulb running for 10 hours uses 1 kWh. Your electricity bill charges you a rate per kWh (e.g. $0.10/kWh) times your total monthly consumption.

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