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Home & UtilitiesGenerated accuracy model review: 2026-05-06

Refrigerator Running 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

  • Daily kWh = running watts / 1000 x 24 x duty cycle percent / 100. Annual cost = daily kWh x electricity rate x 365.

Test cases

Default input regression check

Generated from the checked-in default inputs and calculate function.

Inputs

  • Running Wattage: 180 W
  • Duty Cycle: 35%
  • Electricity Rate Preset: eia_us_residential_average
  • Electricity Rate: 0.18 $/kWh

Expected outputs

  • Annual Running Cost: $90.95
  • Monthly Cost: $7.58
  • Daily Energy Use: 1.51 kWh

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

  • Running Wattage accepts values in W.
  • Duty Cycle accepts values in %.
  • Electricity Rate Preset accepts one of the configured options.
  • Electricity Rate accepts values in $/kWh.
  • Annual Running Cost is displayed as currency.
  • Monthly Cost is displayed as currency.
  • Daily Energy Use is displayed in kWh.

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 refrigerator-running-cost-calculator calculator definition.

Change log

2026-05-06

Published default regression test documentation and metadata fallbacks for Refrigerator Running Cost Calculator.

Calculator transparency

Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.

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