Result
$5.49
This home office setup costs about $5.49 for the entered month.
- Total watts
- 195 watts
- Monthly kWh
- 34.32 kWh
Estimate only. Verify wattage, utility rates, equipment ratings, and safety requirements before relying on this cost. Read the full disclaimer.
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At a glance
- Cost
- Free
- Login
- Not required
- Best use
- Estimate home office electricity cost from computer, monitor, lighting, peripherals, hours, workdays, and kWh rate.
- Output
- Browser result with print and PDF options
- Reviewed
- 2026-09-04
Result summary
Quick answer
With the sample inputs, this calculator returns $5.49. Total watts: 195 watts. A hypothetical 120 W computer, 45 W monitor, and 30 W of accessories total 195 W. At 8 hours for 22 workdays and $0.16/kWh, the cost is $5.49.
Publisher Published by EverydayCalc Editorial Editorial standards and limitations
Each calculator shows its formula and defines the inputs. Worked examples make the math checkable. The page also names the limits that can change the result.
Last calculation review:
Instructions
How to use this calculator
Open the short walkthrough for choosing and checking inputs.
Enter the average operating draw for your computer, monitors combined, and other devices that follow the same work schedule. Add hours per workday, workdays in the month, and your electricity rate. Calculate devices with different schedules separately or use the electricity calculator's multi-device planner.
Page guide
On this page
Jump directly to the part of the calculator you need.
Calculation details
Formula and methodology
See the exact math used to produce the result.
Total watts = computer watts + monitor watts + other office watts. Monthly kWh = total watts / 1,000 × hours per workday × workdays. Cost = monthly kWh × rate per kWh.
Before acting
Assumptions to check
Review the real-world details that can change the estimate.
All components use the same entered hours and workdays at their entered draw. The model does not add sleep, overnight, weekend, room heating, or cooling energy unless you include it in compatible inputs. Workdays defines the entered month; no average-month multiplier is applied.
More guidance Examples, methodology, and planning checks Open the worked example, review notes, reference tables, and practical next checks.
What to verify before acting
Check what stays on after work. Adding a 24-hour router or an intermittently used printer to an eight-hour shared schedule will misstate its use. Separate schedules before deciding whether power-management changes matter.
Computer rating versus actual workday draw
A power-supply capacity is not a measurement of normal computer consumption. Use draw representative of your workload and account for sleep or idle time. ENERGY STAR describes power-management features; the calculator does not assume a particular certified model or savings percentage.
When to use this calculator
- Budgeting electricity for a shared office schedule
- Comparing work-from-home day counts
- Separating office-hours devices from continuous background loads
Tips for better estimates
- Add all monitors only when their schedules match.
- Use representative workload watts instead of power-supply capacity.
- Price overnight loads separately before adding totals.
How this calculator is reviewed
This page is checked for inputs, formulas, examples, assumptions, topic fit, and related links. For this calculator, the review also covers watts, hours used, local electricity rate, duty cycle, seasonal use, and efficient alternatives.
The sample result is covered by automated tests, and the page links to related calculators and, where available, supporting guides so readers can check the assumptions before acting. If a formula, label, or assumption looks off, send the page URL and your inputs through the contact page.
Sources to verify assumptions
The linked references provide context for energy units, rates, and the equipment topics they cover. The examples below are hypothetical calculations using the stated inputs, not measurements or current utility price quotes.
Worked example
Example inputs: Computer watts: 120 watts; Monitor watts: 45 watts; Other office watts: 30 watts; Hours per workday: 8; Workdays per month: 22; Electricity rate: $0.16 /kWh. With those values, the calculator returns $5.49. This home office setup costs about $5.49 for the entered month.
Home office costs for different work months
| 10 workdays | 15.6 kWh; $2.50 |
|---|---|
| 22 workdays | 34.32 kWh; $5.49 |
| 26 workdays | 40.56 kWh; $6.49 |
Example scenarios
- Hypothetical setup: 120 + 45 + 30 = 195 W across the devices used together.
- 195 W / 1,000 × 8 hours × 22 workdays = 34.32 kWh; at $0.16/kWh the cost rounds to $5.49.
- A separate 10 W device running 24 hours for 30 days uses 7.2 kWh and costs $1.15 at the same rate. Price it separately instead of giving it the office's eight-hour schedule.
Quick reference chart
| Sample result | $5.49 |
|---|---|
| Total watts | 195 watts |
| Monthly kWh | 34.32 kWh |
| Best next step | Check what stays on after work. Adding a 24-hour router or an intermittently used printer to an eight-hour shared schedule will misstate its use. Separate schedules before deciding whether power-management changes matter. |
FAQs
Home Office Electricity Cost Calculator questions
Can I enter the wattage printed on my PC power supply?
That is usually a capacity rating, not normal consumption. Use a representative operating draw for the workload, or measured average watts over the period you want to price.
How do I include two monitors?
Add their watts in Monitor watts if they follow the same schedule. If one is used for fewer hours, calculate it separately or use the multi-device electricity planner.
Does this include nights and weekends?
Only if the entered hours and workdays cover them. Equipment that runs continuously needs its own schedule; the calculator does not infer background operation.
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Common planning mistakes
Treating PSU capacity as measured draw, counting a device twice under accessories, or assuming an eight-hour work schedule includes overnight consumption.
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