Know your solar numbers
before anyone calls you.
Real savings estimates, system sizing, ROI, and battery planning — powered by your actual bill and location, not a lead form in disguise.
Every calculator you need, in one place
From your first "what would I save?" question to sizing a battery for backup power, each tool answers one specific decision — instantly, in your browser.
Why PureEnergyTools is different
Most "solar calculators" online are lead forms wearing a calculator's clothes — you enter your name and phone number before you ever see a number, because the real product is your contact info, sold to an installer's sales team. Every tool here works the other way around: enter your bill or your appliances, get your answer immediately, and decide for yourself what to do next.
The math behind each calculator uses real, disclosed assumptions — regional peak sun hours instead of a flat national average, an 85% system efficiency derate instead of an optimistic best-case number, and 80% battery depth of discharge instead of a battery's full rated capacity. We explain these assumptions on every tool's page instead of burying them in fine print.
Where a genuine live data source exists, we use it instead of a static guess. Sun-hour figures come from NASA's POWER satellite database for your exact coordinates, not a rounded national average. Currency conversion uses live exchange rates fetched at calculation time, not a rate we hardcoded last year. Grid carbon intensity for the Carbon Offset Calculator reflects your specific country's current generation mix, not a single global figure applied everywhere. Where no reliable live source exists — appliance wattage, for instance, is a manufacturing spec, not a live feed — we say so plainly rather than dressing up a static number as something it isn't.
Who's Behind This
PureEnergyTools is an independent tools site, not affiliated with any solar installer, panel manufacturer, or utility company. We're not trying to sell you a system — we're trying to give you the numbers to evaluate one, whether that means talking to three local installers with realistic expectations or deciding solar doesn't make sense for your situation yet. Questions, corrections, or a calculator you wish existed — reach us at [email protected]. More on how we approach this on the About page.
Frequently Asked Questions
Is PureEnergyTools affiliated with a solar installer?
No. We're an independent tools site. Some pages include optional affiliate links to installer or equipment partners, clearly disclosed, but every calculator's math is identical whether or not you click one.
Do these calculators work outside the United States?
Yes. Our sun-hour and grid carbon-intensity data cover dozens of countries across North America, Europe, the Middle East, South Asia, and beyond, with currency selection built into the relevant tools.
How accurate are the results?
Each tool is built for realistic planning estimates, not guarantees — actual costs, savings, and system performance depend on your specific roof, equipment, and installer. Use these numbers to sanity-check quotes and compare options, then confirm final numbers with a licensed installer.