LLM API Cost Calculator
Estimate GPT, Claude and Gemini API spend per call and per month.
About the LLM API Cost Calculator
Enter token counts or paste your prompt, set output length, call volume and prompt-cache ratio, then compare cost per call, per run and per month across every major model. Prices are editable so you can model your own negotiated rates.
Examples
1k calls
1,000 in / 500 out on GPT-4oOutput
$7.50 totalKeyboard shortcuts
- Copy the main outputCtrl / ⌘ + Shift + C
- Download the resultCtrl / ⌘ + S
- Share this toolCtrl / ⌘ + Shift + S
- Reset the inputsAlt + R
- Open the tool search paletteCtrl / ⌘ + K
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Frequently asked questions
Read more
- How LLM tokens really work (and why your word count is a bad estimate)
BPE splits words, punctuation and whitespace into pieces. Here is how tokens are counted, why context windows overflow, and how to plan a prompt that fits.
Version 1.0.0 · Updated 2026-08-14 · Runs entirely in your browser