Use this solar savings calculator to estimate how much a home solar system could reduce your electricity costs.
Enter your monthly electricity bill, electricity rate, system size, and battery choice to estimate monthly savings, annual savings, bill reduction, and long-term savings potential.
- Estimated monthly savings
- Estimated annual savings
- Estimated bill reduction
Not sure what a field means? See the Solar Calculator Glossary for quick definitions and examples.
Estimate your solar savings
Your savings estimate
Enter your details and calculate to estimate how much a solar system could reduce your electricity costs.
Long-term view
Estimated savings over the next 12 months under the current assumptions.
A simple long-term savings view before tax credits, financing, or local incentive modeling.
A broad long-term estimate based on stable electricity and production assumptions.
How this solar savings calculator works
This calculator estimates your current annual electricity spend using your monthly electricity bill and electricity rate. It then uses your estimated system size and a simplified annual solar production assumption to estimate how much electricity your solar setup could generate each year.
From there, it applies a simplified savings factor to estimate how much of that solar production becomes real bill reduction. The results are shown as estimated monthly savings, annual savings, bill reduction percentage, and simple long-term savings scenarios.
Assumptions used in this calculator
This tool is designed as a U.S. residential solar planning calculator. By default, it uses a solar production factor of 1,200 kWh per kW per year, which is a simplified assumption for annual solar output.
It also uses a simplified savings factor to estimate how much solar production turns into actual electricity bill reduction. This matters because not every unit of solar production always offsets your bill at the full retail electricity rate.
If your local conditions differ, you can adjust the calculator’s Advanced options to fine-tune the production and savings assumptions instead of relying only on the defaults.
What affects solar savings most
- Your electricity rate
- Your estimated system size
- Your annual solar production
- Whether battery storage is included
- How much solar production becomes real bill offset
- Your utility’s net metering or export credit rules
In simple terms, higher electricity rates and stronger solar production usually produce stronger savings. Battery storage can improve how much of your solar energy is used when you actually need it, but the exact impact depends on your usage pattern and local utility rules.
Real-world savings context
Recent consumer-facing solar data shows why savings can vary so much from one home to another. EnergySage says the average U.S. homeowner may save around $61,000 over 25 years, while broader ranges can run from roughly $37,000 to $148,000 over 25 years depending on electricity prices, system size, and local conditions.
That variation is one reason this calculator should be used as a planning tool rather than a final quote. If your electricity rate is relatively low, your savings may look modest even with a decent solar system. If your electricity rate is high, the same size system can look much more attractive financially.
For more context, see EnergySage’s guide to solar savings and its net metering explainer.
Why real savings can differ from a simple estimate
The U.S. Department of Energy notes that solar output can be affected by season, time of day, clouds, dust, obstructions, and shading. DOE also notes that storage can help shift solar value into periods when the sun is not shining. That means actual bill savings depend not only on how much your system produces, but also on when you use electricity and how your utility compensates solar exports.
For more detail, see the U.S. Department of Energy’s solar and storage basics and its overview of grid-connected renewable systems.
What this estimate does not include
- Federal tax credits or local incentives
- Solar financing or loan terms
- Electricity price inflation over time
- Utility-specific export compensation rules
- Installer-specific production modeling
That is why this calculator should be used as a planning estimate for electricity bill savings, not as a final financial decision by itself.
FAQ
How accurate is this solar savings calculator?
This calculator is designed for planning and comparison. It gives you a useful estimate based on simplified assumptions, but actual savings depend on your utility, solar production, export rules, and local conditions.
Does this include battery savings?
Yes. If you select battery storage, the calculator uses a different savings factor to estimate how storage may improve usable bill savings.
Why is bill reduction different from total solar production?
Not every unit of solar production automatically turns into full bill reduction. That depends on how much energy you use directly, how your utility credits exported electricity, and how much value storage adds to your setup.
Can I use this calculator without the Cost Calculator?
Yes. You can enter your own estimated system size manually, or use the Cost Calculator first to get a starting point.
Next step: estimate your solar payback
Once you have a savings estimate, the next step is to compare those savings against system cost, incentives, and long-term return. Use the Payback Calculator to continue the process.