Free tools for a smarter energy day
Your home energy.
A little clearer.
From the cost of a full charge to how long a battery lasts. Make sense of the numbers with simple, transparent energy calculators.
Explore the calculators✓ Free to use✓ No sign-up✓ Calculated in your browser
YOUR EVERYDAY ENERGY☀
EXAMPLE · 300 kWh × $0.25/kWh$75.00 estimated electricity cost
Less guessworkDESIGNED FOR REAL-LIFE QUESTIONSElectricity / EV charging / Solar / Battery
01 / The toolkit
Start with your question.
Use your own rates and equipment details. We'll show you the math.
Electricity
Electricity Cost
What does your energy really cost?
ElectricityAppliance Energy Cost
Find the cost of everyday appliances.
EV chargingEV Charging Cost
Know the cost before you plug in.
EV chargingEV Charging Time
Plan a home charging window.
SolarSolar Energy Generation
Turn sunlight into a first estimate.
SolarSolar Self-Consumption Value
Understand where solar value comes from.
BatteryBattery Backup Time
How long could your essentials run?
BatteryHome Battery Size
Start with the loads you care about.
No black boxes
A number is only useful
if you know what it means.
Every tool includes a formula, a worked example and the assumptions behind the estimate. Prices are yours to enter, wherever you live.
Built by Zhang Guangpeng, drawing on a background in digital energy software.
How our calculators work ↗