34 free calculators · Updated for 2026

Know exactly how much
you'll save with solar

Instant, unbiased calculators for solar panels, EVs, battery storage and home energy. Real data for all 50 US states — no signup, no sales pitch.

Solar Savings Calculator Browse all 34 calculators →
✓ No signup required ✓ No data sold ✓ Free forever
Quick estimate · National average
System cost (8 kW)$24,000
After 30% federal ITC$16,800
Annual electricity savings$1,540/yr
Payback period10.9 yrs
25-year net profit$21,700
Calculate your numbers →
34
Free calculators
50
US states covered
30%
Federal ITC 2026
$25k+
Avg 25-yr savings
All 34 Free Tools

Every calculator you need

Instant results, real state data, no signup. Pick the tool that matches your situation.

Solar panels

12 calculators
Solar Savings
Annual $ savings from your roof
Payback Period
Years until panels pay for themselves
Solar ROI
25-year return on investment
System Size
How many panels and kW you need
Tax Credit (ITC)
Federal 30% credit + state credits
Net Metering
Credits for power you sell back
Solar Output
Daily and annual kWh production
Solar Loan
Monthly payment and interest
Lease vs Buy
True 25-year cost comparison
PPA vs Buy
Power purchase agreement analysis
Off-Grid Solar
Full energy independence sizing
Solar + EV Savings
Combined solar and EV savings

Battery storage

5 calculators
Battery Storage
Capacity needed and payback
Powerwall ROI
Is a Tesla Powerwall worth it?
Battery Bank Size
DIY battery bank sizing guide
Self-Consumption
Solar used vs exported to grid
Time-of-Use Savings
Peak vs off-peak rate savings

Electric vehicles

5 calculators
EV vs Gas Cost
True annual fuel cost comparison
EV Charging Cost
Monthly home charging cost
EV Road Trip
Total charging cost for any trip
Charger Install Cost
Level 2 home charger total cost
Battery Degradation
Range loss over time by model

Home energy

7 calculators
Heat Pump Savings
vs gas furnace annual savings
Heat Pump Water Heater
Savings vs electric water heater
Home Energy Cost
Cost by appliance and usage
Insulation Savings
Heating and cooling savings
Smart Thermostat
Annual HVAC savings
LED Lighting Savings
Replace incandescent bulbs
IRA Rebate
Inflation Reduction Act eligibility

Specialty & commercial

5 calculators
Commercial Solar ROI
Business solar with MACRS
Agricultural Solar
Farm solar and USDA REAP grant
Wind Turbine
Home and farm wind energy output
Carbon Footprint
Home energy and transport CO₂
CO₂ Offset
Carbon savings from solar
No lead generation forms
Real EIA & NREL data
2026 federal ITC included
Free forever, no signup
Solar Data by State

Find your state's numbers

Electricity rates, peak sun hours and incentives vary widely. Select your state for a precise calculation.

AL
Alabama
13.4¢ 5.3h
$1659/yr est.
AK
Alaska
23.4¢ 3.1h
$1482/yr est.
AZ
Arizona
13.2¢ 6.5h
$2505/yr est.
AR
Arkansas
11.9¢ 5h
$1389/yr est.
CA
California
29.4¢ 5.8h
$3485/yr est.
CO
Colorado
14.2¢ 5.5h
$1824/yr est.
CT
Connecticut
24.8¢ 4.2h
$2433/yr est.
DE
Delaware
14.8¢ 4.5h
$1555/yr est.
FL
Florida
13.5¢ 5.7h
$2022/yr est.
GA
Georgia
13¢ 5.2h
$1776/yr est.
HI
Hawaii
40.8¢ 6h
$4288/yr est.
ID
Idaho
11¢ 5h
$1284/yr est.

¢ = avg electricity rate (¢/kWh) h = peak sun hours/day est. = estimated annual solar savings

View full data for all 50 states →
Why Green Energy Calculators

Straight answers.
No sales pitch.

Every other solar calculator we found was built to collect your phone number for an installer. We built these because real homeowners making real financial decisions deserve accurate tools — not lead generation funnels.

  • Uses EIA electricity rate data and NREL sun hour data for every US state
  • Includes 2026 federal 30% ITC and all major state incentives
  • Results update instantly as you adjust any input — no page reloads
  • Zero ads that track you, zero data sold, zero signup required
  • Methodology is transparent — every formula is documented
About our methodology →
Data sourced from
EIA
U.S. Energy Information Administration
NREL
National Renewable Energy Laboratory
IRS
IRS Publication 5695 — ITC guidelines
SEIA
Solar Energy Industries Association
DSIRE
Database of State Incentives for Renewables
Guides

Learn before you buy

All guides →
Guide12 min read

How Many Solar Panels Fit on a 1,000 sq ft Roof? (2026 Layout Guide)

How many solar panels fit on a 1,000 sq ft roof in 2026? Get panel counts, usable space …

Guide10 min read

How Many Solar Panels Fit on a 1,250 sq ft Roof? (2026 Layout Guide)

How many solar panels fit on a 1,250 sq ft roof in 2026? Layout rules, usable space, system size, …

Guide10 min read

How Many Solar Panels Fit on a 1,500 sq ft Roof? (2026 Layout Guide)

How many solar panels fit on a 1,500 sq ft roof? Most homes fit 20–30 panels. Learn the 2026 layout …

Guide11 min read

How Many Solar Panels Fit on a 500 sq ft Roof? (2026 Layout Guide)

How many solar panels fit on a 500 sq ft roof? Get panel counts, system sizes, layout rules, and …

Guide12 min read

How Many Solar Panels Fit on a 750 sq ft Roof? (2026 Layout Guide)

How many solar panels fit on a 750 sq ft roof? Most roofs hold 18–20 panels. Learn usable space …

Guide11 min read

How Many Solar Panels for a 4,200 sq ft House? (2026 Sizing Guide)

How many solar panels for a 4,200 sq ft house? Most homes need 28–36 panels and a 14–18 kW system in …

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