Home Energy Audit Calculator

Estimate annual energy costs, emissions, and savings from efficiency upgrades.

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What This Calculator Does

Estimate annual energy costs, emissions, and savings from efficiency upgrades.

It combines Monthly Electricity, Monthly Natural Gas, Electricity Rate, Gas Rate to estimate Annual Energy Cost, Estimated Annual Savings, Post-Upgrade Cost.

Formula & Method

Annual cost C=12(kWh\cdot rate_e)+12(Therms\cdot rate_g). Upgrade savings S=C\cdot improvement\% and post-upgrade cost C'=C-S. Emissions scale similarly from energy-use factors.

Notation used in the formulas: R = Annual Energy Cost; x_{1} = Monthly Electricity; x_{2} = Monthly Natural Gas; x_{3} = Electricity Rate; x_{4} = Gas Rate; x_{5} = Efficiency Improvement.

Method summary: inputs are normalized to consistent units, core equations are evaluated, then secondary values are derived and rounded for display.

Use this calculator for quick scenario analysis. Start with baseline values, change one driver at a time, and compare how sensitive the results are to each input shown above.

Inputs Used

Monthly Electricity: Used directly in the calculation.
Monthly Natural Gas: Used directly in the calculation.
Electricity Rate: Used directly in the calculation.
Gas Rate: Used directly in the calculation.
Efficiency Improvement: Used directly in the calculation.

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