Anthropic's documented pixels-to-tokens formula, applied to three real image sizes, with the resize ceiling that caps what any single image can cost.
An image sent to Claude is billed as input tokens, and the count is a function of its pixel dimensions rather than its file size. Anthropic publishes the arithmetic, which means you can price a vision workload before you send a single request.
The documented formula
Anthropic’s vision documentation gives the estimate as width in pixels multiplied by height in pixels, divided by 750:
tokens ≈ (width_px × height_px) / 750
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