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For a 30-day month, running a laptop around the clock means 720 hours of use. Each average watt measured at the wall adds 0.72 kWh (units) to that month’s electricity use. At an illustrative average draw of 20–60 W, that is 14.4–43.2 units. The rupee cost depends on your laptop’s actual average draw and your household’s applicable electricity rate; there is no single price for all of India.
How to calculate monthly electricity use
Use the laptop’s average power draw while YouTube is playing—not the maximum wattage printed on its charger. For continuous use over 30 days:
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Average wall draw (W) × 720 hours ÷ 1,000 = monthly energy (kWh, or units)
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Since 1 kWh is one unit, each average watt used for 720 hours equals 0.72 kWh. The 720-hour assumption is specifically a 30-day month; a calendar month with a different number of days will have a different total.
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| Assumed average wall draw | Energy over 30 days at 24/7 use |
|---|---|
| 20 W | 14.4 kWh |
| 40 W | 28.8 kWh |
| 60 W | 43.2 kWh |
These are arithmetic scenarios, not measurements of a particular old laptop. The 20–60 W range is illustrative, not a guaranteed range for every machine. Your laptop may use less or more depending on its components and how it is configured.
How to estimate the cost in rupees
Multiply the monthly kWh by the applicable marginal energy rate for your household. Check the rate and any adjustments or subsidy shown on your current bill or your electricity distributor’s tariff schedule. Your bill may include charges beyond the energy charge, so this calculation estimates the additional energy-charge portion, not necessarily the full change in your bill.
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There is no nationwide rupee-per-unit rate that applies to every household. Retail tariffs are determined by State Electricity Regulatory Commissions, and state governments may subsidize particular consumer categories. Fuel and power-purchase cost adjustments may also affect charges under applicable rules. The Ministry of Power’s explanation of state tariff-setting and subsidies is available through the Press Information Bureau.
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Measure your laptop’s actual average draw
The most useful way to reduce uncertainty is to measure the laptop and charger together at the wall while it is playing representative YouTube content.
- Connect the laptop and its charger through a plug-in electricity usage meter that is compatible with your outlet and the electrical ratings involved.
- Run the laptop in the playback setup you want to estimate. Keep typical settings such as screen brightness, power mode, playback resolution, and sleep or display behavior in place.
- Record the average watts over a representative interval. A brief reading may not reflect changing playback or laptop activity.
- Insert that average into the 720-hour formula for a 30-day month, then multiply the resulting kWh by your applicable marginal energy rate.
A charger’s printed wattage is its maximum rating, not the laptop’s average consumption. Screen brightness, power mode, browser and playback behavior, and whether the display sleeps can all change the measured draw. No particular meter model is recommended here; check compatibility before buying or using one.
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Keep the comparison fair
If you compare laptops or playback setups, compare measured average wall watts under the same conditions, calculate energy for the same number of hours, and apply the same local marginal tariff. Keep playback resolution, screen brightness, power mode, and sleep behavior as consistent as possible. A difference in state tariffs or billing slabs is not evidence that one laptop is more efficient than another.
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