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Home & UtilitiesGenerated accuracy model review: 2026-05-06
Home Office Electricity Cost Calculator accuracy and testing
This page documents how Calwarden builds trust for this calculator: source notes, regression-style default tests, limitations, assumptions, unit handling, rounding, and visible change history.
Formula source
- Monthly cost = (computer watts + monitor watts + accessory watts) / 1000 x hours per workday x workdays per month x electricity rate.
Test cases
Default input regression check
Generated from the checked-in default inputs and calculate function.
Inputs
- Computer Power: 120 W
- Monitor Power: 60 W
- Accessory Power: 40 W
- Hours per Workday: 8 hr
- Workdays per Month: 22 days
- Electricity Rate Preset: eia_us_residential_average
- Electricity Rate: 0.18 $/kWh
Expected outputs
- Monthly Electricity Cost: $6.38
- Monthly Energy Use: 38.72 kWh
- Annual Cost: $76.57
Known limitations
- This page documents the checked-in calculator logic and does not certify results for every real-world edge case.
- Use the result as a planning estimate unless the calculator page states a stricter purpose.
Assumptions
- All prices, rates, taxes, and usage values are entered by the user.
- Calculations run locally in your browser and are not stored by Calwarden.
- This is planning math, not financial, tax, engineering, or legal advice.
Unit handling
- Computer Power accepts values in W.
- Monitor Power accepts values in W.
- Accessory Power accepts values in W.
- Hours per Workday accepts values in hr.
- Workdays per Month accepts values in days.
- Electricity Rate Preset accepts one of the configured options.
- Electricity Rate accepts values in $/kWh.
- Monthly Electricity Cost is displayed as currency.
- Monthly Energy Use is displayed in kWh.
- Annual Cost is displayed as currency.
Rounding rules
- Number displays use up to 2 decimal places in the calculator UI.
- Currency outputs are displayed with standard US dollar formatting.
- Input precision follows configured step values where provided.
Version history
1.0.0 - 2026-05-06
Generated accuracy and testing page from the current home-office-electricity-cost-calculator calculator definition.
Change log
2026-05-06
Published default regression test documentation and metadata fallbacks for Home Office Electricity Cost Calculator.
Calculator transparency
Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.