Calculator hub
Choose the right solar calculation first
PVSize calculators stay focused: answer the planning question, show assumptions, and point to the next useful step.
- No signup required
- Assumptions shown
- Free to compare
Choose your starting point
Panel Count
See how many solar panels fit your roof and what the system could produce.
Open calculator →Savings
Estimate payback and annual savings from your electricity bill.
Open calculator →Battery Sizing
Match backup goals with a practical battery capacity estimate.
Open calculator →Carbon Reduction
Translate solar output into avoided emissions and impact framing.
Open calculator →Next step
When to use a guide or detailed plan
If you want deeper explanation, start with the relevant guide. If you want to share project details with PVSize for a more detailed plan, use the request page after you have a rough estimate.