Reduce idle energy from TVs, consoles, and chargers. Enter watts, hours, quantities, and your rate. Compare today’s standby costs to targeted reduction savings annually.
Use these sample standby loads as a starting point. Actual values vary by model and settings.
| Device | Typical standby watts | Common hours/day | Notes |
|---|---|---|---|
| Television | 3–8 | 24 | Instant-on features can raise standby use. |
| Game console | 8–20 | 24 | Sleep modes can be high if updates stay enabled. |
| Set-top box | 6–15 | 24 | Often runs continuously for guides and recording. |
| Phone charger | 0.1–1.5 | 24 | Low per unit, but many add up. |
| Microwave clock | 2–5 | 24 | Display and electronics draw constant power. |
| Desktop PC (sleep) | 2–10 | 12–18 | Depends on wake features and peripherals. |
For each device: Daily Wh = Standby watts × Quantity × Hours/day
Totals: Annual kWh = (Sum of Daily Wh × 365) ÷ 1000
Reduction: Annual kWh (reduced) = Annual kWh × (1 − Reduction% ÷ 100)
Savings: Annual cost saved = (Annual kWh saved) × Rate
Payback (if cost is entered): Payback years = Upgrade cost ÷ Annual cost saved
Standby power is the electricity devices draw while “off” or waiting. A router, set‑top box, console, and chargers can create a steady baseline. Because it runs 24 hours, small wattage becomes meaningful energy over a year. At 10 W, a single device uses about 87.6 kWh annually, which is multiplied by your electricity rate to estimate cost. For many homes, standby accounts for 5–10% of household electricity use, so measuring it is an easy way to cut bills without changing comfort at all.
This calculator converts each entry into daily watt‑hours using watts × quantity × standby hours. It then scales to annual kWh by multiplying by 365 and dividing by 1000. If you add six devices averaging 5 W for 24 hours, the total is 720 Wh/day, or roughly 262.8 kWh/year. That figure is a practical target for reduction projects.
Reduction represents the percentage drop you expect after steps like smart strips, disabling instant‑on modes, or unplugging during long idle periods. If current standby energy is 300 kWh/year and you aim for a 60% reduction, the reduced level becomes 120 kWh/year. The difference, 180 kWh/year, becomes your energy saved and drives the annual cost savings.
Annual cost is calculated as kWh × rate, so higher tariffs increase the value of each saved kWh. If your rate is 0.18 per kWh and you save 180 kWh/year, you save about 32.40 per year. With a 25 one‑time spend on strips or timers, simple payback is about 0.77 years. Try changing rate, hours, and reduction to see best‑case and conservative scenarios.
When you enter a CO₂ factor, saved kWh are converted to avoided emissions in kilograms. Using 0.45 kg/kWh and 180 kWh saved, the annual reduction is about 81 kg CO₂. The CSV and PDF exports capture assumptions, device rows, and headline results so you can document improvements, compare rooms, or track changes after equipment upgrades.
Standby power is electricity used when equipment appears off or idle, such as sleep modes, clocks, instant‑on features, and power adapters left plugged in.
Check device labels, manuals, smart plug measurements, or reputable product specs. Measure for several minutes because some devices cycle between low and higher standby states.
Not always. If you unplug, switch off at the wall, or use a timer, enter the hours the device actually remains powered while idle each day.
Many households can cut 30–70% using smart strips, disabling instant‑on, scheduling routers, and unplugging rarely used devices. Start conservative, then refine after measuring.
A one‑time cost lets you estimate simple payback for power strips, smart plugs, or replacements. Compare annual savings to cost to prioritize the fastest wins.
Results are estimates based on entered watts, hours, and rate. Accuracy improves when you measure standby watts with a plug meter and update entries after behavior or equipment changes.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.