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Home & UtilitiesGenerated accuracy model review: 2026-05-06
Gas vs Electric Appliance 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
- Gas cost = gas units x gas price + gas-only fees. Electric cost = kWh x electricity rate + electric-only fees.
Test cases
Default input regression check
Generated from the checked-in default inputs and calculate function.
Inputs
- Gas Use: 80 units/yr
- Gas Price: 1.6 $/unit
- Gas Extra Fees: 0 $/yr
- Electric Use: 900 kWh/yr
- Electricity Rate Preset: eia_us_residential_average
- Electricity Rate: 0.18 $/kWh
- Electric Extra Fees: 0 $/yr
Expected outputs
- Lower Operating Cost: Gas is lower
- Gas Annual Cost: $128.00
- Electric Annual Cost: $148.32
- Annual Difference: $20.32
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
- Gas Use accepts values in units/yr.
- Gas Price accepts values in $/unit.
- Gas Extra Fees accepts values in $/yr.
- Electric Use accepts values in kWh/yr.
- Electricity Rate Preset accepts one of the configured options.
- Electricity Rate accepts values in $/kWh.
- Electric Extra Fees accepts values in $/yr.
- Gas Annual Cost is displayed as currency.
- Electric Annual Cost is displayed as currency.
- Annual Difference 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 gas-vs-electric-appliance-cost-calculator calculator definition.
Change log
2026-05-06
Published default regression test documentation and metadata fallbacks for Gas vs Electric Appliance Cost Calculator.
Calculator transparency
Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.