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A PC drawing a steady 50 watts uses 1.2 kWh (units) a day, 36 kWh in a 30-day month, and 438 kWh in a 365-day year. To estimate the energy-charge cost in India, multiply that use by your applicable electricity tariff; the result depends on your state or utility, residential category, consumption slab, and subsidy. The examples below illustrate energy charges only, not the total bill.
How much electricity does a 50-watt PC use running 24/7?
Electricity use is measured in kilowatt-hours (kWh), commonly called units on Indian electricity bills. Convert watts to kilowatts, then multiply by the hours the device runs:
- Convert the load: 50 W ÷ 1,000 = 0.05 kW.
- Daily use: 0.05 kW × 24 hours = 1.2 kWh per day.
- 30-day month: 1.2 kWh × 30 = 36 kWh.
- 365-day year: 1.2 kWh × 365 = 438 kWh.
These figures assume the PC draws an average of 50 W at the wall for every hour. They do not establish the draw of a particular computer or include a monitor, router, or other equipment. If 50 W is only the PC’s draw, add any other equipment separately. An optional plug-in electricity usage monitor can help measure the connected setup’s actual consumption; no particular meter has been evaluated here.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteHow to estimate the cost on your electricity bill
Use the applicable tariff, not a national average
India does not have one residential per-unit rate that applies to every household. Check your current bill or utility tariff schedule for the applicable residential category, tariff period, consumption slab, and subsidy. If the tariff is telescopic, calculate each part of the extra 36 kWh at the rate for the slab it falls into. Your household’s existing consumption matters: the PC’s additional units may cross into a higher slab.
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Separate energy charges from the total bill
Multiplying units by a rate estimates the energy-charge component, not necessarily the PC’s full additional cost on the bill. Fixed charges may already apply and may not rise when you add the PC; electricity duty, surcharges, fuel adjustments, subsidies, and other items may be calculated differently. To estimate the actual extra bill amount, compare the bill with the PC against what it would have been without it, using the applicable tariff and bill rules.
Illustrative electricity costs at selected Indian tariffs
The calculations below apply the stated rate to 36 kWh for a 30-day month. These are examples from different jurisdictions and tariff years, not a current, like-for-like state ranking or full bill estimates.
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| Jurisdiction and category | Tariff basis | Energy-charge estimate for 36 kWh |
|---|---|---|
| Assam, Domestic-A, 0–120 units/month | ₹6.24 per unit after subsidy; Central Electricity Authority (CEA), 2025 compilation for FY 2024-25 | ₹224.64 per month |
| Bihar, DS-II Demand Based, 0–100 units | ₹4.12 per unit after subsidy; CEA, 2025 compilation for FY 2024-25 | ₹148.32 per month |
| Himachal Pradesh, Domestic, 0–125 kWh/month | ₹2.07 per unit after subsidy; CEA, 2025 compilation for FY 2024-25 | ₹74.52 per month |
| Chhattisgarh, domestic, first 0–100-unit slab | ₹4.40 per unit under the CSERC FY 2026-27 schedule; before applicable subsidy or other bill items | ₹158.40 for 36 additional units in the first slab |
| Lakshadweep, LTDS-II domestic, first 0–100-unit slab | ₹3.55 per unit under the Department of Electricity FY 2026-27 schedule; before other bill items | ₹127.80 for 36 units in the first slab |
The CEA examples are from its 2025 publication, which compiles FY 2024-25 tariffs and subsidies; they may not be the rates for a reader’s next bill. The Chhattisgarh State Electricity Regulatory Commission (CSERC) FY 2026-27 schedule says energy charges are telescopic, so a household whose added use falls across more than one slab must split the calculation across those slabs. Its schedule also identifies fixed charges as monthly minimum charges and notes that domestic consumers may receive subsidies under State Government orders. Lakshadweep is a Union Territory, not a state; its cited schedule also lists a fixed charge of ₹25 per kW/month. Fixed charges and other bill components are not included in the table’s energy estimates.
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The available examples do not establish the cheapest or most expensive state: they cover different tariff years and jurisdictions, and the CEA state table cited here covers FY 2024-25. For a current personal estimate, use your utility’s applicable schedule and your bill.
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What can change the estimate?
- Actual wall draw: 50 W is an assumption, not a measurement of every PC. Power use can vary with the computer and its workload.
- Equipment included: a monitor, router, or other connected hardware adds consumption if it is not already included in the 50 W assumption.
- Billing period: 36 kWh assumes a 30-day month; use 1.2 kWh multiplied by the actual number of days for another billing period.
- Household slab: applicable rates can depend on total household consumption and whether the added use crosses a slab boundary.
- Subsidy and bill items: eligibility and the calculation of duty, fixed charges, and other adjustments affect the amount payable beyond the energy-charge arithmetic.
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