Homelab Operator
Power cost for homelab operators: what your 24/7 server actually costs
Calculate yearly cost as watts x 8.76 x your kWh rate. A 100W server at $0.30/kWh costs $263/year. Measure idle power separately, it dominates the bill.
Homelab operators often underestimate the yearly electricity cost of a 24/7 server. A 100W home NAS at $0.30/kWh costs $263 per year. A 300W rack server at the same rate costs $789. A 500W GPU rig costs $1,315. These numbers compound across a rack.
Why this matters for you
The formula is simple: watts x hours x 365 / 1000 x rate. A 100W device running 24/7 consumes 876 kWh per year. At $0.30/kWh (typical European rate), that's $263. At $0.12/kWh (cheap US rate), it's $105. The biggest lever is idle power: a server that idles at 80W and peaks at 300W averages maybe 120W if it's idle 80% of the time, not 300W. Measure with a wall-socket power meter before estimating.
Verdict
Calculate yearly cost as watts x 8.76 x your kWh rate. A 100W server at $0.30/kWh costs $263/year. Measure idle power separately, it dominates the bill.
Other persona guides
Related tools
RAID Calculator
Calculate usable capacity and fault tolerance for RAID 0, 1, 5, 6, and 10.
Use tool ➜Data Read Visualizer
Visualize the massive speed difference between CPU cache, RAM, and storage.
Use tool ➜RAM Latency Calculator
Convert DDR3/DDR4/DDR5 timings (CL, tRCD, tRP, tRAS) into true latency in nanoseconds.
Use tool ➜