Explore solar calculators for installation cost, electricity bill savings, and solar payback.
These tools are designed for quick U.S. residential solar planning using simple, editable assumptions.
Solar Cost Calculator
Estimate the upfront cost of a home solar installation based on your electricity bill, system size, and planning assumptions.
Estimate Solar CostSolar Savings Calculator
Estimate monthly savings, annual savings, and bill reduction from a home solar system using simple planning inputs.
Estimate Solar SavingsSolar Payback Calculator
Estimate break-even timing, net cost after incentives, and long-term return from a residential solar project.
Estimate Solar PaybackHow to use these tools
The easiest way to use TheSolarMath is to move through the calculators in order. Each tool answers a different part of the solar decision, starting with upfront cost, then estimated savings, and finally payback.
- Start with the Solar Cost Calculator to estimate the upfront cost of a home solar installation based on your electricity bill, system size assumptions, roof conditions, and battery choice.
- Then use the Solar Savings Calculator to estimate monthly savings, annual savings, bill reduction, and long-term electricity cost savings from that system.
- Finish with the Solar Payback Calculator to compare project cost and annual savings, estimate break-even timing, and model long-term return using a simplified federal tax credit assumption.
Each calculator is designed as a planning tool for U.S. residential solar scenarios using simple editable assumptions. These tools are best used as a starting point before comparing real installer quotes, utility rules, and tax details.
If you want help understanding individual inputs and outputs, see the Solar Calculator Glossary for definitions, explanations, and examples from all three calculators.
Start with your solar cost estimate
If you are not sure where to begin, start with the Solar Cost Calculator and move through the savings and payback tools from there.