See Your Clean Energy Savings

Free calculators powered by real NREL and EIA data. Enter your ZIP code for location-based results.

What homeowners are saying

"The Solar ROI Calculator showed an 8.2-year payback for my roof — and the installer quote matched almost exactly. I felt like I actually understood what I was signing."

Solar panel buyer

CA

"The EV Charging Cost Calculator gave me a real TCO breakdown. Switching from gas saves me around $4,200 a year — I verified it myself before buying."

EV owner

FL

"The Heat Pump Savings Calculator projected a 5-year payback. My contractor's quote was within 8% of the estimate. That gave me the confidence to move forward."

Heat pump buyer

TX

20 Free Calculators

Choose a category to explore tools tailored to your goals.

Solar Panel ROI Calculator

Calculate your payback period and 25-year net savings with real NREL solar data.

How Many Solar Panels Do I Need?

Find exactly how many panels you need to power your home.

Solar Panel Cost Estimator

Get a cost estimate for your installation based on location and system size.

Federal Solar Tax Credit (ITC) Calculator

Calculate your federal solar Investment Tax Credit (ITC) savings.

Solar vs Grid Cost Comparison

Compare 25-year total costs of going solar versus staying on the grid.

Solar Battery Storage Calculator

Size your battery backup and calculate days of off-grid storage.

Solar Panel Degradation Calculator

See how panel output decreases over time and its long-term ROI impact.

Solar Net Metering Savings Calculator

Calculate your grid export credits and annual net metering savings.

Optimal Solar Panel Tilt Angle

Find the optimal tilt angle for your location to maximize solar output.

Solar Loan Payment Calculator

Estimate your monthly loan payments for a solar installation.

View All Solar Tools →

View All 20 Tools →

Powered by NREL PVWatts data

Electricity rates from EIA

Independent, no sales pitch

Data from: NREL PVWatts, U.S. Energy Information Administration