PC Electricity Cost Calculator
Estimate desktop or gaming PC running costs across active work, idle time, sleep and standby. Add monitors separately and use either measured wall power or component DC power with PSU losses.
Inputs
Wall measurements already include PSU losses. Exclude monitors from PC power to avoid counting them twice.
For seasonal use, count only days the appliance runs.
PC electricity cost
Estimated month running cost
67.44 units (kWh) in 30 usage days| Period | Units (kWh) | Cost |
|---|---|---|
| Usage day | 2.248 | ₹17.98 |
| Month (30 usage days) | 67.44 | ₹539.52 |
| Year (365 usage days) | 820.52 | ₹6,564.16 |
- Active PC
- 1.6 kWh/day
- Idle PC
- 0.28 kWh/day
- Sleep
- 0.04 kWh/day
- Off / standby
- 0.008 kWh/day
- Monitor(s)
- 0.32 kWh/day
Remaining off time: 8 h/day. Non-usage days assume the setup is disconnected. PSU capacity is not actual consumption; presets are examples, not measurements.
Running energy cost only. Fixed charges, taxes, subsidies and utility-specific tariff rules are excluded.
How this calculator works
Separate wall power from PSU capacity
A PSU’s wattage rating is its output capacity, not a measurement of continuous PC consumption. Wall measurements already include conversion losses. If you instead enter component DC power for active and idle states, the calculator divides it by the entered PSU efficiency.
Account for a full 24-hour operating day
Active, idle and sleep hours must sum to at most 24. Remaining hours are assigned to the off/standby wattage. Monitor energy uses its own hours and can overlap PC operation; it is not an additional PC operating state. Non-usage days are assumed disconnected and contribute no energy; choose 365 usage days to model this schedule all year.
Avoid counting peripherals twice
PC active and idle inputs should exclude monitors. If a whole-setup wall meter already includes screens, enter zero separate monitor watts. Sleep and off inputs are wall values, so no second PSU efficiency adjustment is applied to them.
Calculation formulas
PC wall W (component mode) = Component DC W ÷ PSU efficiency fractionOff hours = 24 − Active hours − Idle hours − Sleep hoursDaily kWh = [Active wall W × Active h + Idle wall W × Idle h + Sleep W × Sleep h + Off W × Off h + Monitor W × Monitor h] ÷ 1,000Worked example
Illustration: 400 W active for 4 h, 70 W idle for 4 h, 5 W asleep for 8 h, 1 W off for the remaining 8 h, and a 40 W monitor for 8 h total 2.248 kWh/day. At an example ₹8/kWh, a 30-day month costs ₹539.52. These are example inputs, not a measurement of your PC.
Understanding the estimate
All prefilled powers, usage patterns and rates are editable examples. This tool runs locally in your browser. Energy-only estimates are not complete electricity bills, and comparisons are scenarios rather than guaranteed savings.
Frequently asked questions
Should I enter my 750 W PSU as PC power consumption?
No. PSU capacity is not actual demand. Use measured wall-socket power at each operating state, or component DC totals with an appropriate efficiency assumption.
Are PSU losses counted twice in wall-power mode?
No. Wall-power mode uses active and idle inputs directly. Only component-power mode divides active and idle watts by efficiency. Sleep, off and monitor figures always represent wall power.
Do monitor hours count toward the PC’s 24-hour limit?
No. A monitor is a separate simultaneous load. The PC’s active, idle and sleep hours must total no more than 24, while monitor hours independently range from 0 to 24.