⚡ The Power Estimator
Estimate. Optimize. Save Power.
Power calculators for the questions you actually have, whether you own the house, wire it, or design it.
I own a home
Understand your electric bill, size a generator, and see whether your service can handle an EV charger or heat pump.
Homeowners →I’m an electrician
NEC 2023 dwelling load calculations, standard and optional methods side by side, with a permit-ready PDF.
Electricians →I’m an engineer
Load calculations today, with voltage drop, fault current, three-phase and transformer sizing tools planned.
Engineers →Free Power Calculators
Get accurate power estimates with our professional-grade calculators. No signup required.
Appliance Power
Calculate how much energy your appliances use and what they cost to run.
- Common appliance presets
- Custom power ratings
- Monthly cost estimates
- Energy usage breakdown
EV Charging
Estimate the cost to charge your electric vehicle at home.
- Battery size calculator
- Charge level estimator
- EV vs gas comparison
- Monthly charging costs
Solar Savings
Find out how much you can save with solar panels.
- Panel requirement calculator
- Savings estimates
- ROI calculations
- Sun hours by location
Generator Costs
Calculate fuel costs for whole home generators and compare fuel types.
- Multiple fuel types
- Load level estimates
- Daily & weekly costs
- Fuel type comparison
Bill Analyzer
Analyze your electric bill to understand usage and find savings.
- Usage breakdown by category
- Compare to average homes
- Time-of-use comparison
- Personalized saving tips
Home Load
Find out how much electrical service your home needs and what size standby generator would cover it.
- Simplified NEC 220.82 optional method
- Calculated load in amps
- Minimum service size
- Standby generator sizing
Why Choose The Power Estimator?
Accurate Results
Industry-standard calculations used by professionals worldwide.
Free to Use
All basic calculators are completely free, no account required.
Pro Features
Upgrade for NEC 2023 load calculations, PDF exports, and contractor features.
Stay Powered Up with Our Newsletter
Get energy-saving tips, new calculator updates, industry insights, and exclusive content delivered straight to your inbox.
Ready for Professional Tools?
Upgrade to Pro for advanced calculators, PDF exports, and contractor-grade features.