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Prompt footprint calculator

Pick a disclosed or independently measured per-prompt figure, set a usage pattern and a grid, and see what it adds up to.

7,300 prompts per year on OpenAI

Electricity
0.00 kWh
  • ≈ 207 smartphone charges
  • ≈ 14.6 km in an electric car
Water (on-site scope)
0.00 L
  • ≈ 4.67 500 mL bottles
  • ≈ 474 teaspoons
Carbon on World average
0.00 kg
  • ≈ 7.01 km driven (petrol car)
  • ≈ 19.9 minutes of a gas boiler
OpenAI→Google

Switching from OpenAI to Google saves 29.4% of the electricity — 730 Wh per year.

Electricity
2.48 kWh→1.75 kWh
−730 Wh per year
Water (on-site)
2.34 L→1.90 L
−438 mL per year
Carbon (World average)
1.19 kg→841 g
−350 g per year

Same prompts, same grid; only the provider changes. Carbon here uses the grid you picked for both, so it shows efficiency, not each company’s clean-energy deals — see the profiles for those. Figures labelled estimate carry roughly ±3× uncertainty.

Equivalents assume 12 Wh per phone charge, a 10 W LED, 0.17 kWh/km for an EV and 170 gCO₂/km for a petrol car. Per-prompt figures are medians or averages; long documents, images and agentic workflows cost far more. How estimates are built.