AI & Prompt Tools · Free tool
AI Output Length Estimator
Predict how many tokens an LLM will generate for summaries, rewrites, code, or essays — budget your max_tokens.
Updated April 2026
Predict how many output tokens a prompt will likely produce so you can budget context window and cost.
Ratio
0.25x
Output tokens
250
~ Words
188
Summaries compress content to roughly a quarter of the input.
Rough averages across popular models. Always set a hardmax_tokenscap in production.
Found this useful?Email
Advertisement
What it does
Estimate how long an LLM response will be by task type — budget max_tokens without truncation.
Runs entirely in your browser — no upload, no account, no watermark. For more tools in this category see the full tools index.
How to use it
- Pick the task type.
- Enter input tokens.
- Read the output estimate.
Advertisement