Energy & Utilities Calculators
Solar panel ROI, electricity cost analysis, EV charging costs, home energy audit savings, commercial utility demand charges, and generator sizing calculators for homeowners, contractors, and facility managers.
6 calculators available
Solar Panel ROI Calculator
Calculate solar system payback period, 25-year savings, and ROI based on system size, installation cost, utility rate, net metering, and federal ITC tax credit using 2026 rates where residential credit expired but commercial 30% ITC remains through 2027.
Use CalculatorElectricity Cost Calculator
Calculate monthly and annual electricity costs from kWh usage and utility rate with optional appliance-level breakdown showing cost per device using 2026 national average of 18.05¢/kWh.
Use CalculatorEV Charging Cost Calculator
Compare EV charging cost per charge and per mile vs gasoline at 2026 prices ($2.90/gallon gas, 17¢/kWh home charging, 40¢/kWh DC fast charging) with battery efficiency and MPGe analysis.
Use CalculatorHome Energy Audit Savings Estimator
Project annual savings from insulation upgrades, HVAC replacement, air sealing, and window improvements with upfront cost, payback period, and 10-year net savings using 2026 energy prices and tax credits.
Use CalculatorCommercial Utility Bill Analysis Calculator
Analyze demand charges, power factor penalties, time-of-use rates, and load factor optimization for commercial electricity bills with rate schedule comparison and cost reduction strategies.
Use CalculatorGenerator Sizing Calculator
Calculate required generator wattage for residential and commercial backup power from critical loads including HVAC, appliances, and equipment with transfer switch sizing and fuel consumption estimates.
Use CalculatorHomeowners, contractors, and facility managers face energy decisions that impact costs and environmental footprint. From calculating solar panel ROI and electricity cost analysis to estimating EV charging costs, home energy audit savings, and generator sizing, energy math affects budgets. Our energy and utilities calculators help consumers and professionals evaluate energy solutions and optimize utility spending.
Why Use Our Energy & Utilities Calculators
Energy calculations blend technical specifications with economic analysis. Solar ROI depends on system size, local incentives, and utility rates. Electricity costs vary by rate structure (flat vs time-of-use). EV charging costs depend on miles driven, kWh prices, and charger efficiency. Generator sizing requires load analysis. Our calculators apply DOE data and utility rate structures for accurate projections.
Who Are These Calculators For?
- Homeowners evaluating solar and energy efficiency upgrades
- Electric vehicle owners calculating charging costs
- Contractors sizing generators and backup systems
- Facility managers optimizing commercial utility spending
- Sustainability professionals quantifying energy savings
Key Features
- Solar panel ROI and payback period calculations
- Electricity cost analysis by rate structure and usage
- EV charging cost estimation by vehicle and mileage
- Home energy audit savings projections
- Generator sizing and commercial utility analysis
How to Choose the Right Calculator
For renewable energy, use the Solar ROI Calculator with local incentives and utility rates. The Electricity Cost Calculator helps understand your bill and identify savings opportunities. EV owners need the Charging Cost Calculator to compare fuel costs vs gasoline. For backup power, the Generator Calculator sizes systems by load requirements. Facility managers should use the Commercial Utility Calculator to analyze demand charges.
Frequently Asked Questions
How do you calculate solar ROI?
ROI = (Annual savings × System lifetime - Total cost) / Total cost × 100. Factors: System size (kW), Production (kWh/year), Utility rate ($/kWh), Incentives (30% federal tax credit + state/local), Financing method. Typical payback: 6-10 years. Our calculator includes all factors with regional adjustments.
How much does EV charging cost?
Cost per mile = (kWh per mile) × (Electricity rate per kWh). Example: 0.3 kWh/mile × $0.13/kWh = $0.039/mile. Compare to $0.15/mile for 25 MPG gas at $3.75/gallon. Home charging is cheaper than public fast charging ($0.15-$0.40/kWh). Our calculator compares EV vs gas costs.
Do you store energy usage or home data?
No. All calculations run entirely in your browser. We do not collect, transmit, or store any utility bills, energy usage, or property information. Your energy data remains private.
Disclaimer
Energy calculators provide estimates based on DOE data, utility rates, and the inputs you provide. Actual energy production, costs, and savings vary by location, equipment specifications, weather, and utility rate changes. Solar production depends on orientation, shading, and weather patterns. These tools are for planning and estimation purposes. Consult with solar installers, energy auditors, and utility providers for site-specific assessments and current rate schedules.