Power Cost Calculator

What does your rig actually cost to run? Annual kWh + dollars by load profile, with live-updating numbers.

CPU

GPU

Hours/day at full load

Hours/day idle (on, not gaming)

Days/week used

Electricity rate ($/kWh)

US 2026 residential average is ~$0.16/kWh. CA/NY/HI run $0.30+. Texas off-peak can be under $0.10.

Annual Electricity Cost

$148

923 kWh / year

AMD Ryzen 7 7800X3D + NVIDIA RTX 4070 Super · 450W full / 92W idle

Full-load draw450 W

Idle draw92 W

Full-load kWh/yr655

Idle kWh/yr268

Rate × kWh$0.16 × 923

That's the same yearly draw as a desktop fan (105W) left on 24/7 all year.

Cost over time

Daily average

$0.40

2.5 kWh/day

Monthly

$12.31

77 kWh/mo

5-year total

$738

4,616 kWh

10-year total

$1,477

9,231 kWh

How this is calculated

Full-load watts = CPU TDP + GPU TDP + 80W motherboard + 30W RAM/drives/fans baseline. Idle watts = 12% of CPU TDP + 8% of GPU TDP + 60W system baseline (drives, fans, board, PSU efficiency loss). Annual kWh sums (full-load watts × full-load hours) + (idle watts × idle hours) across 52 weeks. Annual cost = kWh × your rate. The equivalence above converts your annual kWh into an always-on appliance with the same energy draw.