Estimate energy cost from device wattage, hours, and electricity rate. Currency selector for cost display.
Charging Cost Calculator
Results use the currency you select (display only — amounts are not converted).
How to Use
- Enter watts, hours, and price per kWh.
- Calculate kWh and cost.
Formula
kWh = (W × hours) / 1000. Cost = kWh × rate.
Worked Example
Example: 50 W for 4 hours at $0.15/kWh → 0.2 kWh → $0.03.
What the Result Means
Useful for device and small appliance estimates; utility bills use more factors.
Important Notes & Limitations
- Not a utility-grade audit.
Frequently Asked Questions
Where is price per kWh?
On your electricity bill or utility website.
Phone charging?
Phones use low watts; cost is usually very small.
EV charging?
Use wall power and session hours as an approximation.
Currency?
Applies to the cost display.
Related Calculators
See also: Battery Backup.
Disclaimer: Results are approximate and for educational and informational purposes only. They are not financial, tax, medical, or legal advice. Verify important decisions with a qualified professional.