CALCULATOR DIRECTORY
All calculators
Every calculation runs directly in your browser and requires no account. More solar, EV, and home electricity calculators are on the way.
Electric Vehicles
- EV Charging Cost CalculatorCompare EV charging cost per mile at home, on public DC fast chargers, and against gasoline, using EIA electricity rates for your state.
- EV Charging Time CalculatorEstimate how long it takes to charge your electric vehicle from your battery size, charger power, and charge levels.
- EV vs Gas Savings CalculatorCompare fuel cost and total ownership savings between an electric vehicle and a gas car based on your driving and local prices.
- EV Range CalculatorEstimate how many miles you can drive on your current charge, based on battery size, efficiency, and conditions.
Solar
- RV Solar CalculatorSize an RV solar setup in seconds. Get panel wattage, battery Ah, charge controller and inverter sizing using an NEC 690.8 safety margin.
- Solar Panel Estimate CalculatorEstimate your 2026 solar system size, installed cost, payback period, and 25-year savings using current EnergySage and EIA benchmarks.
- Solar Payback Period & ROI CalculatorFind out how long your solar panels take to pay for themselves, with 2026 electricity rates and incentive data for all 50 states plus ROI, IRR, and year-by-year cash flow.
- Solar Panel CO₂ Savings CalculatorEstimate the annual and 25-year CO2 emissions avoided by your PV system, using EPA eGRID 2024 grid emission factors.
- Solar Fuse Size CalculatorSize DC fuses for any PV string, battery bank, or inverter, using Isc and continuous-current NEC 690.9 rules.
- How Many Solar Panels Do I Need?Find how many solar panels you need from your monthly kWh, sun hours, and panel wattage, with roof area and production estimates.
- Solar Pool Pump CalculatorSize a solar-powered pool pump and array. Get required flow, pump wattage, panel size, and dollar savings versus your existing pool pump.
- Solar Loan CalculatorEstimate your monthly solar loan payment, total interest, and net monthly cost after estimated bill savings.
- Solar Panel Snow Load CalculatorCompute flat- and sloped-roof snow loads with per-anchor shear demand, built on ASCE 7 ground snow values.
- Hybrid Solar System CalculatorSize a grid-tied hybrid solar system: PV array kW, battery kWh, hybrid inverter capacity, and annual self-consumption.
- Solar Tax Credit CalculatorWork out your federal Section 25D residential solar tax credit, your state credit, and how much you can actually claim this year.
- Solar Investment Tax Credit CalculatorEstimate your Section 48E ITC, MACRS depreciation tax shield, and net cost for a U.S. commercial or business solar project.
- Solar Feed-in Tariff Calculator (U.S. Net Metering)Estimate your annual solar export revenue and self-consumption savings, covering NEM 1.0 retail credit and NEM 3.0-style avoided-cost export rates.
Home Finance
- Mortgage CalculatorEstimate your full monthly mortgage payment including PMI, property tax, insurance and HOA, plus total interest and payoff date.
- Refinance CalculatorCompare your current mortgage against a new one to find your monthly saving, break-even point, and whether refinancing costs you more interest overall.