Solar financingKnow your
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8 MIN READ
LIVE ESTIMATE
Quick Solar System Estimator
Estimate panel count and system size for your home in seconds.
900 kWh/mo
4.5 hrs/day
Based on standard 400W solar panels, 78% system derate factor, and 100% annual energy offset.
ESTIMATED PANELS NEEDED
22 panels
System Capacity8.8 kW
Est. Annual Generation11,274 kWh
THE RIGHT TOOL FOR YOUR NEXT STEP
What would you like to work out?
Choose a topic or search for a question.
Every tool includes its method and assumptions.
Showing 20 calculators
Electric Vehicles 4
- Worldwide · use your local inputsEV Charging Cost CalculatorCalculate EV charging cost in 95 currencies, kilometres or miles. Compare home, public fast charging, and petrol or gasoline anywhere in the world.Open calculator
- Worldwide · use your local inputsEV Charging Time CalculatorEstimate how long it takes to charge your electric vehicle from your battery size, charger power, and charge levels.Open calculator
- Worldwide · use your local inputsEV vs Gas Savings CalculatorCompare EV and petrol or gasoline costs in 95 currencies, kilometres or miles. Calculate annual savings and purchase-price break-even.Open calculator
- Worldwide · use your local inputsEV Range CalculatorEstimate how far you can drive on your current charge, in kilometres or miles, from any efficiency unit — kWh/100 km, Wh/km, km/kWh or mi/kWh.Open calculator
Solar 13
- Local inputs · NEC controller marginRV 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.Open calculator
- Worldwide · use your local inputsSolar Power Calculator — kWh, Cost & SavingsEstimate solar system size, installed cost, production and savings using local prices in your currency.Open calculator
- Worldwide · use your local inputsSolar Payback Period & ROI CalculatorEstimate solar payback, ROI and 25-year cash flow in your currency using local installation costs, electricity prices and export rates.Open calculator
- Local grid inputs · EPA comparisonsSolar Panel CO₂ Savings CalculatorEstimate the annual and 25-year CO2 emissions avoided by your PV system, using EPA eGRID 2024 grid emission factors.Open calculator
- US standards · engineering referenceSolar Fuse Size CalculatorEstimate DC fuse size using NEC-based assumptions. A US engineering reference; confirm local electrical requirements.Open calculator
- Worldwide · use your local inputsSolar Panel Size Calculator — Panels from kWhFind system size, panel count and roof area in square metres or feet using your electricity use and local sun hours.Open calculator
- Worldwide · use your local inputsSolar Pool Pump CalculatorEstimate pool pump and solar array size in metric or US units, then calculate savings in your local currency.Open calculator
- Worldwide · use your local inputsSolar Loan CalculatorEstimate your monthly solar loan payment, total interest, and net monthly cost — search your country, price it in 95 currencies, on flat or reducing-balance rates.Open calculator
- US standards · engineering referenceSolar Panel Snow Load CalculatorEstimate panel snow loads using ASCE-based assumptions. A US engineering reference; confirm local structural requirements.Open calculator
- Worldwide · use your local inputsHybrid Solar System CalculatorSize a grid-tied hybrid solar system: PV array kW, battery kWh, hybrid inverter capacity, and annual self-consumption.Open calculator
- United States · tax rulesUS Solar Tax Credit CalculatorUS-only residential solar tax and state incentive estimates. Verify eligibility and installation-date rules.Open calculator
- United States · tax rulesUS Solar ITC CalculatorUS-only business solar investment tax credit estimates. Includes the tax assumptions and eligibility limits of the model.Open calculator
- Worldwide · use your local inputsSolar Feed-in Tariff CalculatorCalculate solar export income and self-consumption savings from your local electricity and feed-in tariff rates in your currency.Open calculator
Home Finance 2
- Multiple currencies · fixed-rate modelMortgage CalculatorEstimate fixed-rate mortgage payments in your currency, with optional local taxes, insurance and extra payments. US-style PMI is optional.Open calculator
- Multiple currencies · fixed-rate modelRefinance CalculatorCompare fixed-rate loan refinancing in your currency, including payments, fees, interest and the break-even month.Open calculator
NEW TO SOLAR?A little clarity.
A little clarity.
A confident next step.
Start with the big picture, then work out the details before comparing installer quotes.
- 01Is solar worth it for me?
Estimate your payback period and long-term return.
- 02How many panels will I need?
Turn your electricity use into a system and panel count.
- 03What could my system cost?
Explore installation costs and projected savings.
BEYOND THE CALCULATOR
All guidesUnderstand the bigger picture.
Sources you can check
Find the data sources, formulas, worked examples, and limitations on each calculator page.
Space to make it your own
Adjust the assumptions to your home, vehicle, and local prices. Results are estimates, not quotes.
Private calculations
Calculator inputs are processed in your browser. No account is needed. See our privacy policy for site analytics.
A FEW USEFUL ANSWERS
Before you calculate.
Which solar calculator should I use first?
Start with solar payback and ROI if you are deciding whether to install solar. Use the panel size calculator to estimate the number of panels, then the solar power calculator to explore installation costs and savings.
Are all of the calculators free?
Yes. All 20 calculators are free to use without creating an account. Each tool includes information about its inputs, calculations, assumptions, and limitations.
Can I use these tools outside the United States?
Yes. Cost tools support 95 currencies, solar sizing accepts local sun hours, and EV tools offer kilometres or miles. US tax credits and NEC/ASCE engineering references remain country-specific and are labelled in the directory. Currency selection does not automatically supply local prices or convert amounts.
How accurate are the results?
Results depend on your inputs and the stated assumptions. Shading, roof orientation, tariffs, equipment, and installation quotes can change real outcomes. Use the estimates for planning and compare them with local quotes and professional advice where needed.