35 free calculators
Energy Calculators
Quick calculators for planning and sanity-checks. All estimates are simplified and meant for rough sizing. Confirm with a certified installer.
Bill Decoder
Turn a monthly bill into an effective ¢/kWh and a next-step plan.
Save MoneySolar ROI
Estimate payback and lifetime savings using state averages.
Save MoneyCost Estimator
Estimate bill impact and rough savings from partial solar offset.
Save MoneyRate Plan Optimizer
Estimate savings from shifting flexible usage to off-peak hours.
Save MoneySolar Sizing
Quick kW estimate based on your monthly kWh.
Go GreenEmissions Estimator
Convert kWh into CO2e using a state-level grid intensity multiplier.
Go GreenBattery Runtime
Estimate how long a battery can run a given average load.
Backup PowerUnit Converter
Convert energy and power units: kWh, MJ, BTU, kW, W.
Go GreenIncentive Finder
Find federal, state, and local incentives for solar, battery, EVs, and more.
Save MoneyIncentive Stack Calculator
Calculate exact dollar amounts for every federal, state, and utility incentive you qualify for — not a list, real numbers.
Save MoneyHome Energy Audit
Walk through your home room-by-room to estimate usage and find savings.
Save MoneyEV Charging Cost
Calculate your monthly EV charging cost and compare to gasoline.
Save MoneyHeat Pump Savings
Compare your current heating costs to a heat pump and see savings.
Save MoneyQuote Checker
Compare your solar installer quote to market benchmarks.
Save MoneyPanel Upgrade
Check if your electrical panel can handle new loads like an EV or heat pump.
Go GreenOutage Readiness
Score your home's resilience during a power outage.
Backup PowerPayback Comparison
Compare solar vs. solar+battery vs. community solar vs. doing nothing.
Save MoneySolar Monitor Interpreter
Upload your solar production data for a health check and performance analysis.
Go GreenSolar Production Tracker
Track your solar system's daily output vs PVWatts estimates. Persistent dashboard with performance alerts.
Go GreenNeighbourhood Solar Map
See how many homes near you have gone solar. Adoption rates, average savings, and rooftop potential by zip code.
Go GreenUtility Rate Lookup
Find your actual electricity rate by zip code. NREL tariff database with residential, commercial, and industrial rates.
Save MoneySolar Financing Calculator
Compare loan vs. lease vs. PPA vs. cash purchase with real APR modeling over 25 years.
Save MoneyCarbon Footprint Calculator
Estimate your household CO₂ across electricity, gas, vehicles, and waste using EPA data.
Go GreenGrid Carbon Intensity
Check how clean your state grid is. EPA eGRID data with state rankings and comparisons.
Go GreenFuel Cost Comparator
Compare electricity vs. natural gas vs. propane vs. heating oil across heating, driving, cooking, and more.
Save MoneyWater Heater Calculator
Compare 5 water heater types — electric, gas, tankless, heat pump — with lifetime costs and tax credits.
Save MoneyAppliance Energy Cost
See how much each appliance costs to run per year. 35+ appliances with standby power detection.
Save MoneyWeatherization ROI
Estimate savings from insulation, air sealing, and windows — adjusted for your climate zone with Section 25C credits.
Save MoneyGenerator Sizing
Size a backup generator based on your critical loads. Compare portable vs. standby with fuel cost estimates.
Backup PowerEnergy Mix Explorer
See where your electricity comes from — coal, gas, nuclear, wind, solar — with all-state rankings.
Go GreenWhat-If Simulator
Toggle policy levers — ITC, net metering, rates — and see how your solar ROI changes in real-time.
Save MoneyCost-of-Ownership Modeller
Model the true cost of your home over 25 years: do nothing vs. solar, battery, heat pump, or full electrification.
Save MoneyAI Data Explorer
Ask energy questions in plain English and get instant answers with charts and sources.
AI-PoweredPolicy Alerts
Track energy policy changes in your state — net metering, rate hikes, new incentives.
AI-PoweredAI Action Plan
Get a personalised energy action plan with costs, savings, and payback periods.
AI-PoweredGuided Pathways
Follow a step-by-step flow to answer common energy questions.
Where to start
- Bill Decoder — understand your current costs
- Solar ROI — estimate savings and payback
- Battery Runtime — plan backup for outages
Disclaimer
These calculators provide simplified estimates only. For quotes and final design, confirm with your utility and a certified installer. Real outcomes depend on roof conditions, shading, interconnection timelines, rate plans, and available incentives.