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For a 30-day month, a laptop averaging 20–60 watts at the wall uses about 14.4–43.2 kWh (units). Using Chandigarh domestic energy-charge rates as an illustration, that is roughly ₹40–₹233 in energy charges—not a national estimate or a complete bill. Your actual cost depends mainly on the laptop’s measured average power draw and your electricity provider’s applicable tariff.
Estimate the electricity cost for 24/7 laptop use
A 30-day month has 720 hours. Multiply the laptop’s average power draw at the wall by its running time, then multiply the resulting energy use by the applicable marginal energy rate.
- Daily energy: average wall draw in watts × 24 ÷ 1,000 = kWh per day.
- 30-day energy: average wall draw in watts × 720 ÷ 1,000 = kWh per 30 days.
- Energy-charge estimate: kWh × applicable marginal energy rate per kWh.
In a 30-day month, each 1 W of average draw adds 0.72 kWh. The important input is the laptop-and-charger draw at the wall during use, not the maximum output printed on the charger.
Illustrative 30-day scenarios
These wattages are calculation assumptions, not measurements, claims about a typical laptop, or YouTube streaming benchmarks. The rates are from the CEA-indexed Chandigarh domestic schedule, shown as effective 1 August 2024 in the CEA’s 2025 compilation. The table calculates energy charges only.
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| Assumed average wall draw | Energy per day | Energy per 30 days | At ₹2.75/kWh | At ₹5.40/kWh |
|---|---|---|---|---|
| 20 W | 0.48 kWh | 14.4 kWh | About ₹40 | About ₹78 |
| 40 W | 0.96 kWh | 28.8 kWh | About ₹79 | About ₹156 |
| 60 W | 1.44 kWh | 43.2 kWh | About ₹119 | About ₹233 |
The Chandigarh schedule lists ₹2.75/kWh for monthly consumption of 0–150 kWh, ₹4.80/kWh for 151–400 kWh, and ₹5.40/kWh above 400 kWh. These are energy-charge rates in a particular schedule, not an India-wide tariff. Your household’s bill depends on its total consumption band and other applicable line items. See the Central Electricity Authority’s 2025 tariff compilation.
How to calculate your household’s actual cost
- Check your tariff. Look at your electricity bill or your local DISCOM or regulator’s current domestic tariff schedule. Identify your consumer category, billing period, energy-charge slabs, and any relevant adjustments. Retail rates and subsidies vary by state, utility, and consumer class; India does not have one household rate. The Ministry of Power’s framework on electricity financial sustainability and affordability discusses the roles of state regulators and subsidies.
- Measure wall draw during representative use. Measure the laptop and charger together while YouTube playback is running, using normal screen brightness and network conditions. A suitably rated plug-in energy meter or energy-monitoring smart plug can help. If the meter records kWh over time, use that reading directly; otherwise, use its average-watt reading in the formulas above.
- Apply the marginal rate to the added energy. Multiply the estimated or measured kWh by the energy rate that applies to the additional consumption. If the added use crosses a slab boundary, follow the utility’s billing rules rather than applying one rate to all units.
- Keep energy charges separate from the full bill. Fixed charges, duties, adjustments, tariff slabs, and subsidies can affect the amount payable. An energy-only estimate does not establish the total incremental bill.
If you cannot measure power, show multiple clearly labeled wattage scenarios rather than treating one assumed number as your laptop’s actual draw.
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Why the laptop’s draw can vary
Power mode, energy-saver settings, display brightness, and screen or sleep settings can affect energy use. Hardware and workload matter too; continuous playback keeps the laptop awake and its network active. Microsoft’s Windows 11 power-settings guidance describes settings that affect power use, but it does not give a universal wattage for 24/7 YouTube playback.
Battery-life figures are not a substitute for measuring wall power. Microsoft notes that Surface battery tests combine active use and modern standby, and that battery life varies with settings and usage. See Surface battery testing and estimated performance.
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What this estimate does—and does not—tell you
- The 20 W, 40 W, and 60 W cases show how to calculate consumption and energy charges; they are not published averages for laptops streaming YouTube.
- The Chandigarh figures illustrate one tariff schedule. They should not be applied to another state or utility without checking its current rates and billing rules.
- The calculated rupee amounts cover energy charges only. They do not determine your total bill or the exact cost for your household.
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