A used desktop’s monthly electricity cost depends on its measured power draw, how many hours you use it, and the marginal tariff on your household bill. There is no single India-wide price: calculate the setup’s monthly units first, then price them against the slab or rate that applies to your connection.
For a 30-day estimate, use combined desktop-and-monitor watts × viewing hours per day × 30 ÷ 1,000. The result is kilowatt-hours, or units. Treat the resulting tariff calculation as an estimate of added energy charges, not a prediction of the whole bill.
Why the cost varies by household
Two people can run similar-looking used PCs for the same number of hours and see different costs. Their actual wall power may differ because of the processor, graphics card, display, age and condition of components, settings and what the computer is doing. Their energy prices may also differ because electricity tariffs are set for particular states or Union Territories, distribution companies, consumer categories and billing periods.
The Ministry of Power says that electricity tariffs in India are determined by the appropriate electricity regulatory commissions under the Electricity Act, 2003. State governments may also subsidise consumer classes. Check the Ministry of Power release for this context, and use the applicable regulator or distribution company order rather than assuming a rate from another state applies to you.
The other important distinction is between energy and the rest of the bill. The computer adds energy use, measured in units. A bill may also contain a fixed or load-based charge, duties, adjustments, subsidies or other items. Those are governed by the tariff and billing arrangement; an existing fixed charge is not electricity that the desktop has consumed.
Measure the desktop and monitor together
A desktop power supply’s rated capacity is not a reading of how much power the computer continuously draws. It indicates what the unit can supply under specified conditions, not what the PC takes from the wall during YouTube playback. Likewise, a figure measured while the computer is idle is not a streaming measurement.
If the display is on while you watch, include it. The most useful figure is the average combined draw at the wall for the whole setup during representative viewing sessions. A plug-in electricity usage monitor, sometimes sold as a watt meter, can measure equipment connected through it. Follow the meter’s instructions and make sure its rating suits the equipment. Measure the computer and monitor together if they share the same measurement point; include speakers or other devices only if you want their consumption in the estimate too.
Take readings during the sort of playback you actually do. A PC showing a video while doing little else can draw differently from one also running several browser tabs, downloads, a high-resolution display or other applications. Settings and components matter, so there is no sound reason to call one wattage typical for every used desktop.
If you cannot measure, choose a clearly labelled estimate for the combined watts and show it as an assumption, not a test result. You can calculate more than one scenario to see how sensitive the answer is to the assumption. Do not substitute the power supply’s label or an idle figure for a measured playback draw.
Calculate monthly units from viewing hours
Once you have combined watts, multiply by the hours you use the setup each day and the number of days in the billing period, then divide by 1,000. Watts multiplied by hours gives watt-hours; 1,000 watt-hours make one kilowatt-hour, which is commonly called one unit on an Indian electricity bill.
Monthly units (kWh) = average combined power (W) × viewing hours per day × days in period ÷ 1,000.
For a clearly labelled illustration, assume—not as a measured typical value—that a desktop and monitor together average 80 W while in use, for 8 hours daily over 30 days. The calculation is 80 × 8 × 30 ÷ 1,000, or 19.2 units. This shows the arithmetic only; your own result changes with your measured draw and actual hours.
Hours change units in a direct proportion if the average draw stays the same. At the same assumed 80 W, using the PC for half as many hours would use half as many units over the same period. If the viewing schedule varies, use a daily average or calculate separate groups of days and add their units. For example, weekday and weekend hours need not be forced into one guessed daily figure.
Use the length of your actual bill period where it differs from 30 days. The formula works with any number of days, but using 30 makes examples easier to compare. Keep the figures for watts, hours and days visible in your notes; that makes it easier to revise the estimate when you get a better meter reading or your schedule changes.
Price units across applicable tariff slabs
Do not multiply all the units by the highest rate printed on a slab schedule, or assume that the first rate applies to every unit. First find the relevant domestic tariff for your location, consumer category and current period. Then work out how the additional units interact with the slab structure shown on your bill or in the official tariff order.
A slab schedule can set one rate for an initial block of units and higher rates for subsequent blocks. To estimate added energy charges, split the desktop’s units among the blocks that apply to the household’s billing calculation, then multiply each portion by that slab’s energy rate. If the added use carries consumption over a boundary, some of the incremental units may be priced at a higher rate. How the tariff is applied can depend on its terms and the household’s existing consumption, so inspect the actual bill and order rather than treating a generic formula as a substitute for them.
For a local illustration only, the Department of Electricity, Lakshadweep publishes an FY 2026–27 domestic LTDS-II schedule with energy rates of ₹3.55/kWh for 0–100 units, ₹5.30 for 101–200, ₹7.70 for 201–300, ₹10.05 for 301–400 and ₹13.05 above 400. The department’s published tariff schedule also lists a fixed charge based on connected load. These are Lakshadweep schedule details, not an India-wide price, and should not be transferred to another consumer or period.
Using the earlier 19.2-unit example, if all those added units fall within the first 0–100 block under that schedule, the energy charge for those units would be 19.2 × ₹3.55, or ₹68.16. That is a conditional illustration of one tariff block, not a general monthly estimate. If the household is already using enough units that some added consumption is billed in higher blocks, the energy-charge addition differs.
A tariff database can help you locate an order, but it should not be your final authority. The India Residential Electricity Tariff Database tracks items such as tariff year, consumer category, slabs, fixed charges and adjustments; its page notes that official tariff orders remain the legal source. Use it as a starting point, then confirm the details with your bill and the relevant regulator or distribution company.
Separate added energy charges from fixed charges
The simplest estimate of the desktop’s added energy charge is the sum of its units in each applicable slab multiplied by that slab’s rate. This isolates the part most directly connected to the extra electricity consumed. It is still an estimate if your household’s total consumption, billing method or tariff treatment is not fully known.
A fixed charge is different. It may be set by sanctioned load, connection type or another tariff rule and may already appear on the bill whether or not you use this desktop. Do not assign that existing amount to the PC as if it were a measured incremental cost. If adding equipment changes a billed load or other tariff condition, check the order and your provider’s guidance; that is a separate question from converting the PC’s kilowatt-hours to energy charges.
This distinction is useful when deciding whether a device is expensive to keep on. Compare the estimated added energy charge with the actual bill’s energy line, not with a bill total that includes charges unrelated to the desktop. For a separate discussion of continuous computer playback and power-use comparisons, see the Windows PC versus Linux power-use article. Its scenarios should not replace a wall measurement for your own equipment.
Consider duties, adjustments and subsidies
Your final bill can differ from the energy-charge calculation. Electricity duty or tax, fuel or power purchase adjustments, subsidies and other tariff components may apply, and their rules vary by jurisdiction and consumer category. Depending on how a line item is calculated, a change in energy use may affect it; other items may be fixed or tied to a different basis. Do not treat every bill component as a per-unit energy rate.
Read the bill’s labels and compare like with like. If it separately shows units, energy charges, fixed charges, duty or an adjustment, note each line rather than collapsing the total into one implied rate. A subsidy may reduce what a household pays, but eligibility and application are local matters. The Ministry of Power release notes that state governments may subsidise consumer classes; that does not establish that a particular household receives a subsidy.
If the adjustment is unclear, consult the current tariff order or ask the distribution company how the line is calculated. The tariff database can point you towards relevant documents, but verify against the official order and your own bill. Avoid using an old bill’s effective price per unit as though it were necessarily the current marginal rate: billing period, total use and other components can all change the apparent average.
Check the estimate against the bill
A useful check is to keep a short record of the meter reading, viewing hours and bill-period units. Compare the estimate with the household’s metered consumption over a period when the PC use is known, while remembering that other appliances, weather and routines also affect total use. A household bill cannot isolate the desktop automatically, but a consistent before-and-after comparison can reveal whether an estimate is obviously out of scale.
Check that the bill’s consumer category and tariff period match the official schedule you used. Confirm the slab boundaries, energy rates and how consumption is allocated across them. If you have changed distribution companies, moved, or switched category, an earlier calculation may no longer fit. Keep a copy of the source order or tariff page and note its effective period alongside your assumptions.
For a modest setup that is used only while someone watches, hours may be the main practical input to refine. If the computer is actually left on overnight or runs a continuous loop, use those real operating hours rather than the time a person watches. The guide to making a YouTube playlist repeat on Android covers a different playback arrangement; whichever device is doing the playback, only include the equipment whose power draw you have measured or deliberately assumed.
If you use a PC for more than playback, allocate the full measured draw carefully. The meter tells you what the connected setup uses during that session, not how much is exclusively caused by YouTube. If the same computer is also used for work, gaming or downloads, either describe the estimate as the cost of the whole setup during those hours or measure a separate session that better represents the use you mean to cost.
When the point is to keep a channel live after your own viewing session ends, electricity is only one practical consideration. A continuously running home computer requires your own equipment to remain switched on, and its measured draw should reflect that operating pattern. For a pre-recorded channel, the guide to continuing a YouTube playlist after it runs out explains a playback issue without changing the electricity calculation: units still depend on combined watts and actual run time.
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FAQ
How much electricity does a desktop use for YouTube?
There is no single useful figure for every desktop. Measure the computer and monitor together during representative playback, then multiply their average watts by the hours used and divide by 1,000 to get units. A power-supply rating is not a reading of actual consumption.
How much will a PC add to my monthly electricity bill in India?
Calculate its monthly units, then price those units using the marginal energy rate or slabs that apply to your connection and billing period. Your state, distribution company, category, existing consumption and bill components matter, so a national monthly price would be misleading. Treat fixed charges separately from added energy charges.
What is the cost to run a computer for eight hours a day?
You need the combined desktop-and-monitor watts and your applicable tariff. As an illustration rather than a measured typical value, 80 W for 8 hours daily over a 30-day month is 19.2 units. Apply the relevant slab rates to those units; if they cross a slab boundary, split them as the tariff requires.
Does the total bill increase by the same amount as the energy estimate?
Not necessarily. Duties, adjustments, subsidies and fixed or load-based charges may affect the bill, and they do not all follow the same calculation. Use the energy estimate as the added energy-charge component, then check the current official tariff and the bill for other applicable items.