Energy

PC Electricity Cost Calculator

Estimate how much electricity your desktop or gaming PC uses — and what it costs per day, month, and year. Use simplified mode for a quick figure from average draw, or advanced mode to split gaming load, idle time, and monitors. An estimate from entered draws, never an exact metered bill.

Last updated: September 30, 2026

Your inputs

Results update instantly as you type.

Calculator mode

Quick average, or a detailed gaming/idle split.

PC power draw(W)

Average wall draw in watts — not the PSU rating. Example: a mid-range gaming PC often averages 250–400 W under load.

Hours per day(h)

Total hours the PC is on, gaming or otherwise.

Gaming power draw(W)

Wall draw while gaming — GPU-heavy load. Measure with a plug meter for best accuracy.

Gaming hours per day(h)

Idle / light-use draw(W)

Browsing, video, or idle desktop draw — often 40–120 W.

Idle hours per day(h)

Monitor power (optional)(W)optional

Per-monitor draw, often 20–40 W. Leave blank for no monitor.

Number of monitors (optional)optional

Blank with monitor watts entered counts as one monitor.

Days per month

Electricity rate(per kWh)

Your price per kilowatt-hour, from your bill.

Currency

Changes display only — it does not look up your local tariff.

Your result · Monthly PC cost

₹504.00

Monthly energy: 63kWh
Daily cost: ₹16.80
Annual cost: ₹6,048.00

Daily energy: 2.1kWh
Annual energy: 756kWh

Free · No signup · Math stays in your browser

What your result means

Monthly PC cost is what the entered usage adds to a billing month at your rate. Monthly energy shows the same answer in kilowatt-hours for comparison with your meter.

In advanced mode the total blends three parts — gaming load, idle time, and monitors — because a PC that games 3 hours and idles 5 costs very differently from one at full load all day.

How the calculation works

Multiply each draw by its hours and divide by 1,000 to get kilowatt-hours: gaming, idle, and monitors separately.
Add the parts for daily energy, scale by days for the month and by twelve for the year.
Multiply each energy figure by your per-kWh rate. Simplified mode skips the split and uses one average draw.

Formula

daily kWh = (gaming W × gaming h + idle W × idle h + monitor W × count × on-hours) ÷ 1000; cost = energy × rate

Gaming energygaming watts × gaming hours ÷ 1000
Idle energyidle watts × idle hours ÷ 1000
Monitor energymonitor watts × count × (gaming + idle hours) ÷ 1000
Daily totalgaming + idle + monitor energy
Costenergy × electricity rate

Worked examples

Example: 350 W average, 6 h/day, 30 days at 8/kWh
mode: simplepcWatts: 350hoursPerDay: 6daysPerMonth: 30rate: 8currency: INR
Result: Daily energy 2.1 · Monthly energy 63 · Annual energy 756 · Daily cost $16.80 · Monthly PC cost $504.00 · Annual cost $6,048.00
Example: 450 W gaming 3 h + 80 W idle 5 h + 1 monitor, at 8/kWh
mode: advancedgamingWatts: 450gamingHours: 3idleWatts: 80idleHours: 5monitorWatts: 25monitorCount: 1daysPerMonth: 30rate: 8currency: INR
Result: Daily energy 1.95 · Monthly energy 58.5 · Annual energy 702 · Daily cost $15.60 · Monthly PC cost $468.00 · Annual cost $5,616.00

Assumptions

What this calculation takes for granted — check these before relying on the result.

Assumptions:

Default values are an example starting point — replace draws with your hardware figures.
Entered watts are treated as wall power (what the meter sees), including PSU losses.
Monitors are assumed on for all gaming + idle hours.
One flat rate applies; time-of-use and slab differences are not modelled.
Annual figures repeat the month twelve times.
Currency selection changes display only; it does not fetch tariffs.

Limitations

Why your real figure may differ:

A PSU wattage rating is a maximum, not consumption — a 750 W PSU in an efficient build may draw 100 W at idle. Only a plug meter gives exact figures.
Real draw swings with CPU/GPU load, game scene complexity, power plans, background tasks, overclocks, and PSU efficiency curves.
Peripherals (speakers, chargers, RGB hubs, external drives, routers) are excluded unless you fold them into the draw.
Sleep vs. shutdown vs. always-on behaviour is not modelled — measure off-hours too.
Fixed charges, taxes, and tiered tariffs mean this is not your exact bill.

Frequently asked questions

Does a 750 W PSU use 750 watts?

No. The rating is the maximum it can deliver; actual wall draw follows what the components demand plus efficiency losses. A 750 W PSU may draw under 100 W browsing the web.

What affects my PC’s real power consumption?

CPU and GPU load, the game or workload, number and brightness of monitors, connected peripherals, OS power settings, PSU efficiency at a given load, and how much time the machine idles versus sleeps.

How do I get an exact figure?

Use a plug-in power meter for a week of normal use, then divide by hours for a true average. This calculator estimates from entered draws — it cannot replace measurement.

Do monitors matter much?

A 25 W monitor over 8 hours a day is 6 kWh a month — small next to a gaming GPU, but meaningful across two or three bright displays left on all day.

Should I include my UPS or speakers?

Only approximately: fold small always-on extras into the idle draw. Large additions (a second PC, a server) deserve their own calculation.

New

Energy