Energy decisions
What will energy cost
in your home?
A bill, a charger, a solar quote, or a backup plan — get a number you can check.
Start with the decision
What are you trying to find out?
Tap a question. The tool opens with sensible defaults you can change.
What will charging cost?
Turn battery size, charge added, electricity rate, and charging losses into a cost per charge.
Calculate charging cost ↗02 · ElectricityWhy is my bill this high?
Estimate appliance or household running cost from watts, hours, and your local price per kWh.
Estimate electricity cost ↗03 · BackupHow long will backup last?
Check runtime from battery capacity, load, inverter efficiency, and the reserve you want to keep.
Check backup runtime ↗04 · SolarHow much solar do I need?
Size an array from daily use, sun hours, system losses, and the roof or budget you have.
Size a solar system ↗Make it local
Use the numbers from where you live.
Choose your region in the header to set a currency and unit defaults. If your market is not listed, use the generic tools and enter the rate on your bill.
Browse electricity prices by country ↗United States planning
Start with your utility rate.
Use the electricity price on your bill, or compare residential rates by country. For time-of-use plans, test both off-peak and peak charging scenarios.
See the United States rate ↗Canada planning
Start with your provincial rate.
Enter the rate on your bill and test seasonal or time-of-use pricing separately. Keep the currency in CAD for a clearer local estimate.
See the Canada rate ↗European planning
Start with your tariff and tax rules.
Use the unit price and standing charge from your bill. For an EV or battery, compare the rate you pay at home with any off-peak tariff.
Browse country rates ↗Australasia planning
Start with your retailer’s rate.
Enter the electricity price and daily supply charge from your bill. Solar and battery results are first-pass estimates—check local export and installation rules.
Browse country rates ↗India planning
Start with your state and DISCOM.
Slab tariffs vary by state and connection. Use the state bill tool when it fits your tariff order; otherwise enter the marginal or average rate from your bill.
Estimate an Indian state bill ↗Bangladesh planning
Start with your tariff order.
DESCO, DPDC, BPDB, and other utilities can apply different charges. Use the slab bill tool for a planning estimate, then compare it with your own bill.
Estimate a Bangladesh bill ↗Explore by system
A practical path through energy.
These are transparent estimates, not electrical designs, installation approvals, vehicle specifications, or financial guarantees. Verify consequential decisions with your bill, product documentation, and a qualified professional.