Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Estimated annual phantom load cost
$140
Realistic savings from cutting the worst offenders
$70
Annual phantom load energy
876
Total continuous standby draw
100
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How to use this
- 1Enter number of always-plugged-in devices.
- 2Enter average standby draw per device (W).
- 3Enter electricity rate ($/kWh).
- 4Enter share you could realistically eliminate (%).
- 5Read your estimated annual phantom load cost on the right — it updates as you type.
- 6Hit Share to keep the scenario or send it to someone.
About this calculator
Phantom or standby load is the power devices draw while 'off' but still plugged in — TVs, game consoles, cable boxes, chargers, and countless small transformers. Individually these look trivial (2-15W each) but a typical US home has 20-40 such devices, and DOE studies put total phantom load at 5-10% of residential electricity use, roughly $100-$200 per year for the average household. This calculator sums the standby wattage of your devices, converts continuous draw into annual kWh and cost, and shows what a smart power strip or unplugging habit on the worst offenders would actually save — often more impactful than people expect for something that requires zero behavior change once set up.
Worked example
Using the values the calculator loads with:
Inputs
- Number of always-plugged-in devices: 25
- Average standby draw per device: 4 W
- Electricity rate: 0.16 $/kWh
- Share you could realistically eliminate: 50 %
Results
- Estimated annual phantom load cost: $140
- Realistic savings from cutting the worst offenders: $70
- Annual phantom load energy: 876
- Total continuous standby draw: 100
What each field means
Inputs
- Number of always-plugged-in devices
- The number of always-plugged-in devices used in the calculation. Starts at 25 so you have a working example on load.
- Average standby draw per device (W)
- The average standby draw per device used in the calculation, measured in W. Starts at 4 W so you have a working example on load. Accepted range: 0.5–30 W.
- Electricity rate ($/kWh)
- The electricity rate used in the calculation, measured in $/kWh. Starts at 0.16 $/kWh so you have a working example on load. Accepted range: 0.02–0.6 $/kWh.
- Share you could realistically eliminate (%)
- The share you could realistically eliminate used in the calculation, measured in %. Starts at 50 % so you have a working example on load. Accepted range: 0–100 %.
Results
- Estimated annual phantom load cost
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Realistic savings from cutting the worst offenders
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Annual phantom load energy
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Total continuous standby draw
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
What actually draws the most standby power?
Game consoles left in 'instant on' mode (10-20W), desktop computers and monitors in sleep mode (5-15W), cable/satellite DVR boxes (15-30W, often the single worst offender since they rarely truly sleep), and older plasma or CRT-era TVs. A $20 plug-in watt meter (Kill A Watt) will find your specific worst offenders in an afternoon.
Is unplugging everything worth the hassle?
No — target the top 3-5 offenders (usually the DVR, a game console, and a desktop PC setup) rather than obsessively unplugging phone chargers that draw under 0.5W. A smart power strip on your entertainment center or office setup that cuts power to peripherals when the main device is off captures most of the achievable savings automatically.
Does unplugging a DVR cause problems?
Cable/satellite DVRs often need to stay on to record scheduled shows and receive guide updates, so this is one case where standby power is a real tradeoff, not just waste — check whether your provider's DVR has a legitimate low-power standby mode versus just leaving it fully active 24/7.
How accurate is a household-wide estimate like this without measuring devices?
It's a reasonable planning estimate — DOE and EPRI field studies consistently find 5-10% of residential electricity use going to standby/phantom loads across thousands of homes. For a precise number for your house, a $20-30 plug-in meter tested on your dozen highest-suspicion devices for a week gives a far more accurate figure than any generic estimate.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Phantom Load / Standby Power Audit Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/phantom-load-audit
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/phantom-load-audit" target="_blank" rel="noopener">Phantom Load / Standby Power Audit Calculator — RevenueLab</a> (2026).</p>
Source: [Phantom Load / Standby Power Audit Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/phantom-load-audit) (2026).