Formula
Watts ÷ 1000 × hours × days = kWh. The calculator multiplies energy by the price you enter.
This is not a utility-bill calculator. Tiered rates, fixed charges, taxes, seasons, and whole-home use vary by location. Use the result to compare the incremental cost of a NAS.
Improve the estimate
Drive sleep and workloads vary. A smart-plug average measured for three to seven days is more useful than a maximum power rating.
Related checks
Compare capacity by drive count and review the hard-drive buying checklist.