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 its electricity cost in India, apply your current residential tariff and subsidy to that extra consumption. The rupee examples below are energy-charge calculations—not complete bill estimates—and come from different jurisdictions and tariff years.
How much electricity does a 50 W PC use in 24/7 operation?
Convert watts to kilowatts, then multiply by the number of hours:
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- 50 W ÷ 1,000 = 0.05 kW
- 0.05 kW × 24 hours = 1.2 kWh per day
- 0.05 kW × 24 × 30 days = 36 kWh in a 30-day month
- 0.05 kW × 24 × 365 days = 438 kWh in a 365-day year
These figures assume the PC draws an average of 50 W at the wall continuously. They do not establish the draw of any particular computer or include a monitor, router, capture hardware, or other equipment. If 50 W describes only the PC, calculate those other devices separately.
What would 36 extra units cost at the cited Indian tariffs?
These examples apply published residential energy rates to 36 kWh for a 30-day month. They illustrate how costs vary; the sources differ in tariff year and jurisdiction, so they are not a current state-by-state ranking or a prediction of your bill.
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| Jurisdiction and source | Published residential rate | Energy-charge calculation for 36 kWh |
|---|---|---|
| Assam, Domestic-A, 0–120 units/month; Central Electricity Authority (CEA), 2025 compilation for FY 2024-25 | ₹6.24 per unit after subsidy | 36 × ₹6.24 = about ₹224.64/month |
| Bihar, DS-II Demand Based, 0–100 units; CEA, 2025 compilation for FY 2024-25 | ₹4.12 per unit after subsidy | 36 × ₹4.12 = about ₹148.32/month |
| Himachal Pradesh, Domestic, 0–125 kWh/month; CEA, 2025 compilation for FY 2024-25 | ₹2.07 per unit after subsidy | 36 × ₹2.07 = about ₹74.52/month |
| Chhattisgarh, domestic schedule; Chhattisgarh State Electricity Regulatory Commission (CSERC), FY 2026-27 | ₹4.40 for 0–100 units | 36 × ₹4.40 = ₹158.40/month before any applicable subsidy or other bill items |
| Lakshadweep, LTDS-II domestic; Department of Electricity, FY 2026-27 | ₹3.55 for 0–100 units | 36 × ₹3.55 = ₹127.80/month before other bill items |
The CEA figures are from its 2025 publication, which compiles tariff and subsidy information for FY 2024-25. They may not match rates on a later bill. For Chhattisgarh, the FY 2026-27 domestic schedule describes energy charges as telescopic and says subsidies may apply under State Government orders. Lakshadweep is a Union Territory example, not a state tariff comparison; its listed FY 2026-27 schedule also includes a fixed charge of ₹25 per kW per month.
How to calculate your own electricity cost
- Confirm what the 50 W represents. The estimate applies only to the equipment included in that assumed wall draw. Add separate loads, such as a monitor or router, if you want a whole-setup estimate.
- Use the matching billing period. For 30 days, the assumed 50 W load adds 36 kWh. For another period, multiply 0.05 kW by its hours of operation.
- Find the applicable tariff. Check your current utility bill or tariff order for your state or utility, residential consumer category, consumption slab, tariff year, and subsidy eligibility.
- Apply the rate or slab calculation. For a flat applicable rate, multiply the extra kWh by that rate. For a telescopic tariff, calculate each portion in its own slab. CSERC’s FY 2026-27 order says, “Energy Charges are telescopic”: its example applies the first-slab rate to the first 100 units and the next rate to consumption beyond that.
- Separate energy charges from the rest of the bill. Fixed charges, electricity duty, fuel adjustments, surcharges, and subsidies may affect the amount payable. Their treatment depends on the applicable bill and tariff order.
For the extra cost caused by the PC, compare the bill with and without its additional consumption rather than treating every bill charge as a new PC cost. Fixed charges may already apply to the household and may not rise when the PC is added; variable duties or other items can be calculated separately.
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How to check whether your PC really averages 50 W
The calculation is only as accurate as the assumed draw. An optional plug-in electricity usage monitor can help measure the connected equipment over a representative period. No particular meter or PC setup has been evaluated here. Check what is plugged into the meter: measuring the PC alone will not include a display, router, or other devices elsewhere in the setup.
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Electricity cost is not set by one national household per-unit rate. The examples mix different jurisdictions and schedules: the CEA figures are FY 2024-25 data, while the Chhattisgarh and Lakshadweep examples are FY 2026-27. Consumer category, consumption slab, subsidy, and bill components also matter. A fair state comparison would require current, like-for-like tariffs across utilities; these examples do not establish which state is cheapest or most expensive.
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