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 →
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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 →
Guide9 min read

How Many Solar Panels for 20 kWh Per Day? (Sizing + Real Cost)

A home using 20 kWh per day needs a 6–8 kW solar system costing $14,000–$22,000 before incentives. …

Guide9 min read

How Many Solar Panels for 30 kWh Per Day? (Real System Size + Cost)

How many solar panels for 30 kWh per day? Get exact system sizes, 2026 installed costs, payback by …

Guide9 min read

How Many Solar Panels for a 40 kWh/Day Home? (Sizing + Cost Guide)

How many solar panels does a 40 kWh/day home need? Find system size, installed cost, payback period, …

Guide11 min read

Solar Panels for 35 kWh/Day — What Size System? (Cost Breakdown)

Solar panels for a home using 35 kWh per day need a 10–12 kW system costing $19,600–$25,200 after …

Guide11 min read

Solar System Size for 25 kWh/Day: What Does It Cost? (Calculator)

Find out what solar system size covers 25 kWh per day, how many panels you need, and what a 7–8 kW …

Guide10 min read

How Many 400W Solar Panels for a 3-Bedroom House? (Sizing Calculator)

How many 400W solar panels does a 3-bedroom house need? Real sizing formulas, state data, cost …

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