Four free calculators for the decisions that actually move your budget — buying vs. renting, which car really costs less, and whether solar pays for itself. No signup, no guesswork.
Each one is a self-contained tool — open it, enter your own numbers, and see the full breakdown. Nothing is saved or sent anywhere.
Weigh buying against renting — mortgage, fees, service charges, and appreciation, laid out side by side so you can see the real monthly cost, not just the headline price.
Compare cars the way your bank account feels them — fuel or charging, insurance, depreciation, and upkeep — instead of just the sticker price.
Size a solar water heater for your household — tank capacity, collector area — and see the payback period against your current electric bill.
Estimate panel count, system size, and expected bill offset from rooftop solar — sized to your home or business’s own consumption.
Buying a home, choosing a car, or considering solar — each calculator is built around one real decision, not a generic form.
Rent, fuel prices, roof size — whatever the tool asks for is yours to fill in. Defaults are there to guide, not to guess for you.
Every tool shows its working, not just a final number, so you can see exactly where the total comes from.
Short explainers behind the numbers — read before you run the calculators, or after, to sanity-check what you got.
Sunlight, system size, degradation, electricity prices — the variables that actually decide whether solar pays off.
Read article →How much hot water your household really needs, and why getting the tank size right changes the payback.
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