Cost to run a NVIDIA RTX 4090 (24GB)
A NVIDIA RTX 4090 (24GB) (GPU) draws roughly 25 W at idle and up to 400 W under load. Run 24/7 at a typical ~138 W and the US average of $0.17/kWh, it uses about 1,209 kWh a year and costs roughly $205.51/year ($17.13/month). In higher-priced regions such as Germany (€0.40/kWh) the same device costs about €483.55/year. Adjust the calculator for your own draw and electricity price.
Source: HomelabWatts wattage database. Data as of 2026-06-13.
High-end GPU used for serious local LLM and ML workloads.
Idle vs load running cost
| Scenario | Power | Energy / year | Cost / year (US) |
|---|---|---|---|
| Idle | 25 W | 219 kWh | $37.23 |
| Typical 24/7 | 138 W | 1,209 kWh | $205.51 |
| Full load | 400 W | 3,504 kWh | $595.68 |
Card-only. Full 450 W TDP under sustained load; idle is modest but the host must also be running. Source: HomelabWatts wattage database, data as of 2026-06-13.
Cost by region (typical 24/7 draw)
| Region | Price/kWh | Cost / month | Cost / year |
|---|---|---|---|
| United States (avg residential) | $0.17 | $17.13 | $205.51 |
| Germany | €0.40 | €40.30 | €483.55 |
| France | €0.28 | €28.21 | €338.49 |
| United Kingdom | £0.25 | £25.19 | £302.22 |
| Spain | €0.25 | €25.19 | €302.22 |
Prices from electricity price presets (EIA / Eurostat), data as of 2026-06-01. Excludes standing charges and taxes.
Frequently asked questions
How much does it cost to run a NVIDIA RTX 4090 (24GB) per year?
At a typical 24/7 draw of about 138 W and the US average of $0.17/kWh, roughly $205.51 per year ($17.13/month). At €0.40/kWh in Germany it is about €483.55. Use the calculator above for your own price.
How many watts does a NVIDIA RTX 4090 (24GB) use?
Approximately 25 W at idle and up to 400 W under load. Card-only. Full 450 W TDP under sustained load; idle is modest but the host must also be running.
Are these figures measured or estimated?
Estimated. They are compiled from manufacturer specifications and community wall-meter measurements; your exact draw depends on configuration, firmware and attached storage. Measure at the wall for a precise figure.
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Last updated: 2026-06-13