Prompt Token Estimator: Free AI Cost Calculator

You’ll get a token estimate and a live cost comparison across eight current Claude, GPT, and Gemini models — before you spend a single API call.

Your prompt: 0 Characters, 0 Words, 0 estimated tokens. Estimate only—not a real tokenizer. Verify current pricing on the provider’s own pricing page before committing to production spend—token pricing has moved at least once per lab since mid-2026. Code—roughly 3.2 characters per token and 0.5 words per token.

Key takeaways

• Multiply an estimated per-item token count by the number of items before you queue ten thousand API calls, not after.
• For an exact number, use the token count a provider’s own API returns in the response or their published tokenizer library.
• Why do different AI models count tokens differently?

Two blocks of text with an identical character count can differ noticeably in token count depending on how much of that text is code versus prose.

Read the full article: https://www.ainvasion.com/prompt-token-estimator/