Token Budget Allocator
Split max_tokens across system / user / output
📚 Learn more — how it works, FAQ & guide Click to expand
Learn more — how it works, FAQ & guide
Click to expand
Token budget allocator
Plan your token allocation across all parts of a prompt to avoid overflow errors.
How to use this tool
- 1
Enter context window
Your model’s total limit (e.g. 200K for Claude, 128K for GPT).
- 2
Enter component sizes
System prompt, few-shots, expected user input, desired output.
- 3
See if it fits
Warnings when you overflow + recommendations.
Frequently Asked Questions
Why this matters?
Overflowing context = hard API error, or silent truncation = wrong answers. Planning ahead lets you know max user input size before a request fails in production.
Hidden overhead?
Tool definitions, chat role delimiters, safety system prompts from providers — these add 200-2000 tokens. Budget 5-10% buffer for "invisible" system overhead.
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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.