Green Home

Browse 11 green home tools. Opening Standby Power Aggregator.

Building Heat Loss & Insulation CalculatorEstimate heat loss watts from envelope area, ΔT, and R-value.Use this to find where your home leaks heat and size heating correctly.
Home Insulation Savings CalculatorEstimate annual heating and cooling savings from upgrading wall insulation and windows—before/after energy use and efficiency score.Use this to see if an insulation upgrade pays for itself in lower bills.
LED Savings & ROI CalculatorCompare legacy bulb vs. LED costs, CO₂ savings, and payback time for a single fixture.Use this to see how fast swapping one bulb to LED pays back.
LED vs. Incandescent ROI CalculatorEnergy and bulb replacement savings when matching lumens with lower watts.Use this to see the full savings of switching your lighting to LED.
Smart Thermostat Savings CalculatorHVAC kWh reduction from setback schedules and seasonal rates.Use this to check if a smart thermostat would really lower your bill.
Window Solar Heat Gain (SHGC) CalculatorCooling load from glazing SHGC, area, and sun exposure.Use this to see how much your windows heat the house and add to cooling costs.
Microgrid ROI CalculatorBreak-even timeline and 10–20 year returns for solar, storage, and on-site generation microgrids.Use this to see when a solar-plus-storage microgrid starts paying for itself.
BESS Round-trip Carbon Cost CalculatorEstimate annual kg CO₂ from battery round-trip conversion losses and compare grid charging vs. renewable charging.Use this to check your battery setup is helping the climate, not hurting it.
Solar Water Heater Efficiency CalculatorEstimate thermal efficiency, absorbed kWh, and electric heating savings from tank volume, ΔT, sun hours, and collector area.Use this to see how much a solar water heater cuts your electric heating bill.
Small Wind Turbine Yield CalculatorEstimate rotor power (W), daily kWh, and annual energy from blade diameter, average wind speed, and system efficiency.Use this to check if your site has enough wind to make a turbine worthwhile.
Standby Power AggregatorAdd TVs, chargers, consoles, and adapters to see total vampire power cost and what you could buy instead.Use this to total up your standby waste and see what that money could buy instead.

Standby Power Aggregator

Inputs

Adjust values to update results live

Standby devices

One row per device. Enter standby watts and quantity for each.

Device 1
Device name
Standby power (W)
Quantity
Device 2
Device name
Standby power (W)
Quantity
Device 3
Device name
Standby power (W)
Quantity
Device 4
Device name
Standby power (W)
Quantity
Device 5
Device name
Standby power (W)
Quantity

Electricity rate$/kWh

Annual vampire cost

$25.75/yr

That's about $25.75 /yr on your electricity — that's around $2.15 a month.

184 kWh/yr · 21 W

Total standby watts21 W

Total annual energy184 kWh/yr

Est. annual cost$25.75/yr

What you could buya year of premium coffee or several LED bulb packs

Potential savings$23.19/yr

Television$6.13/yr

AV receiver / converter$4.91/yr

Gaming console$9.81/yr

Phone charger$2.45/yr

Computer monitor$2.45/yr

Want to stop the waste? Check out our Smart Thermostat Savings Calculator

Note: Daily kWh = Σ (standby W × qty × 24 h) ÷ 1,000. Annual cost = daily kWh × 365 × rate. Potential savings assumes ~90% standby cut with smart strips or switched outlets.

Save Report: Download a PDF via JoinMyPDF.

Share this calculator

How to use the Standby Power Aggregator

The Formula

Daily kWh = Σ (standby W × quantity × 24 h) ÷ 1,000. Annual cost = daily kWh × 365 × your $/kWh rate. Modern devices draw watts even when screens are off—chargers, converters, and instant-on TVs are common culprits.

Practical Example

Smart strips and switched outlets can eliminate most always-on draw. Pair this audit with Smart Thermostat Savings for HVAC waste and LED Savings ROI for lighting upgrades.

About Standby Power Aggregator

Smart strips and switched outlets can eliminate most always-on draw. Pair this audit with Smart Thermostat Savings for HVAC waste and LED Savings ROI for lighting upgrades.

Q: Is standby worth fixing? A: One charger is pennies; a dozen devices add up to real money. Q: How accurate are defaults? A: Override watts with a plug meter for best results. Q: vs. Vampire Power Cost? A: Same math—this tool aggregates a whole-home list in one view.

Related tools

Smart Thermostat Savings CalculatorHVAC kWh reduction from setback schedules and seasonal rates.Use this to check if a smart thermostat would really lower your bill.
Vampire Power Cost CalculatorEstimate yearly electricity cost for TVs, chargers, and other devices drawing power in standby.Use this to find hidden standby costs and decide what to unplug.
LED Savings & ROI CalculatorCompare legacy bulb vs. LED costs, CO₂ savings, and payback time for a single fixture.Use this to see how fast swapping one bulb to LED pays back.
Energy Consumption CalculatorEstimate total kWh from watts, hours per day, and number of days.Use this to forecast usage over any period and catch bill surprises early.

How to use the Standby Power Aggregator

The Formula

Practical Example

Smart strips and switched outlets can eliminate most always-on draw. Pair this audit with Smart Thermostat Savings for HVAC waste and LED Savings ROI for lighting upgrades.

About Standby Power Aggregator

Smart strips and switched outlets can eliminate most always-on draw. Pair this audit with Smart Thermostat Savings for HVAC waste and LED Savings ROI for lighting upgrades.

Appliances

Green Home

Backup

EV Charging

Cost

Pool

TOU