You’ll find it under the Formulas tab, in the Formula Auditing group. Once you open it, just hit Add Watch and select the cells you want to monitor. The pop-up will show you the sheet name, cell ...

Independent analyses estimate that a medium-length GPT-5 response, which is about 150 to 200 words of output, or roughly 200 to 300 tokens, uses about 19.3 watt-hours ... to-calculate-yours-263252.