I got tired of doing mental math for API token costs, so I built a simple AI Prompt Calculator

I’ve been experimenting a lot with different AI models lately, and I realized I was getting incredibly annoyed having to constantly dig up pricing pages just to figure out what a prompt would actually cost. Trying to manually calculate input vs. output token prices across OpenAI, Anthropic, and Google was just a headache and breaking my workflow.

To fix my own annoyance, I put together a simple AI Prompt Calculator. It’s nothing crazy, just a basic tool to handle the math for me so I don't have to keep a spreadsheet open.

It’s completely free and just a side project, but I figured I'd share it here in case anyone else is dealing with the same annoyance.

If you end up trying it out, I'd really appreciate any feedback. Are there any specific models you use that I missed, or anything I can tweak to make it work better for your workflow? Let me know what you think.

Link: https://ai-prompt-calculator-5uja.bolt.host/