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Calixo

Prompt Token Estimator

Get a quick estimate of how many tokens a piece of text will use.

Inputs

Saved Scenarios

— select 2+ to compare

Estimated Tokens

1,000

Spark says

How it's calculated

Formula

Tokens≈Characters4Tokens \approx \dfrac{Characters}{4}
4
— Approximate average characters per token for English text

What is the Prompt Token Estimator?

Tokenization splits text into sub-word pieces, and the exact count depends on the model's tokenizer — but ~4 characters per token is a widely-used, reasonably accurate rule of thumb for English text.

How to use it

  1. 1 Enter (or paste-count) the number of characters in your prompt.

Worked examples

4,000 characters

About 1,000 tokens.

Try it

Limitations

  • •This is an approximation, not an exact tokenizer — code, non-English text, and unusual formatting can tokenize quite differently from plain English prose. For exact counts, use your provider's official tokenizer.

Frequently asked questions

Is 4 characters per token exact?

No — it's a widely-cited approximation. Actual tokenization varies by model and content type; use it for quick estimates, not billing-critical calculations.