Solar Calculators
Six free tools help you size a system, check your roof, plan backup and test the economics. Every one shows its assumptions and runs in your browser.
Choose a calculator
- Electricity Bill Savings Calculator: size and generation from your units
- Solar System Size Calculator: capacity, panels and area
- Solar ROI and Payback Calculator: use your own quote and tariff
- Solar Rooftop Area Calculator: capacity from roof dimensions
- Solar Battery Backup Calculator: battery size from your appliances
- Solar Panel Price Estimator: component list for your configuration
How to use them well
Start with your latest bill to find monthly units, measure usable roof area, then compare results across tools. The numbers are estimates, so treat them as a starting point for a site assessment.
Calculator limits to keep in mind
All tools use a single general assumption for sunshine and efficiency, so results will be higher or lower at specific sites. They do not model shading, equipment brands or tariff slabs. Treat them as a quick sanity check before a site assessment, and compare outputs from more than one tool to spot inconsistent inputs.
Frequently asked questions
Are these results a quotation?
No. They are illustrative estimates from the stated assumptions.