At a continuous average draw of 30 watts, a laptop and streaming setup uses 0.72 kWh a day, 21.6 kWh in 30 days, or 262.8 kWh in 365 days. The rupee cost depends on your electricity provider’s tariff, consumption slab, and any subsidy. As a scoped example, 21.6 kWh at Lakshadweep’s FY 2026–27 domestic energy rates would cost about ₹77 or ₹114 in energy charges, depending on the applicable slab—not necessarily the full increase to your bill.
How much electricity does 30 watts use in a month?
Convert watts to kilowatts, then multiply by the number of hours:
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- 30 W ÷ 1,000 = 0.03 kW.
- 0.03 kW × 24 hours = 0.72 kWh per day.
- 0.72 kWh × 30 days = 21.6 kWh in a 30-day month.
- 0.72 kWh × 365 days = 262.8 kWh in a year. Divided by 12, that is 21.9 kWh per average month.
These are calculations from the stated 30 W assumption, not a published measurement of a particular laptop or stream. A 30-day month is used for the monthly figure; a calendar month may be shorter or longer.
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There is no single household electricity rate for all of India. The Ministry of Power says that tariffs are determined by the appropriate electricity regulatory commissions, and that state governments may subsidize consumer classes, including domestic users. Your distribution company, tariff category, billing slab, and subsidy affect the marginal rate you pay. See the Ministry of Power’s 10 August 2026 reply on electricity tariffs.
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A Lakshadweep illustration, not a national rate
The Lakshadweep Department of Electricity’s FY 2026–27 schedule lists domestic energy rates of ₹3.55/kWh for the 0–100-unit slab and ₹5.30/kWh for the 101–200-unit slab. Multiplying the example’s entire 21.6 kWh by each rate gives:
| Illustrative rate from Lakshadweep FY 2026–27 | Calculation for 21.6 kWh | Energy-charge estimate |
|---|---|---|
| ₹3.55/kWh, 0–100-unit slab | 21.6 × ₹3.55 | ₹76.68, roughly ₹77 |
| ₹5.30/kWh, 101–200-unit slab | 21.6 × ₹5.30 | ₹114.48, roughly ₹114 |
These are illustrative energy charges, not a prediction of a specific household’s bill. The calculation applies one rate to all 21.6 units for easy comparison. If your tariff uses telescopic slabs, some units may be charged at one rate and the rest at another. Fixed charges, duties, adjustments, and other bill components are excluded. The Lakshadweep schedule also has a fixed monthly charge; consult the Department of Electricity tariff schedule for its terms. Other states have their own schedules and effective dates; the Central Electricity Authority’s 2025 tariff compendium, published on the CEA site in 2026, includes state-specific examples, not one uniform Indian price.
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How to calculate your own likely energy cost
- Find the real wall draw. Use the average watts for the complete setup while it is streaming—not the maximum wattage printed on the laptop adapter. If you do not know the draw, an optional plug-in electricity usage monitor can help measure it over representative operation; no particular model or accuracy is implied here.
- Calculate the energy for your billing period. For a constant 30 W load, use 0.72 kWh per day, or multiply 0.03 kW by the hours in your chosen period. If the measured average is different, substitute that figure.
- Check your own tariff schedule and bill. Identify the domestic tariff category, applicable consumption slab, and subsidy for your electricity provider and billing period. Electricity bills are based on measured kWh; the CEA’s tariff compendium provides state-specific context, while the Ministry’s reply discusses metering and billing rules.
- Apply the marginal rate carefully. Multiply the added kWh by the rate that applies to those units. For telescopic slabs, split the units across the relevant rates rather than pricing every unit at the lowest slab. Treat the result as an energy-charge estimate, then account separately for applicable fixed charges and other bill components.
Measured kWh is the useful input for a bill estimate; an adapter’s printed maximum rating does not establish the laptop’s continuous draw. The calculation alone does not show whether an old laptop averages 30 W in your setup.
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