toolbox #283 · developer productivity

Token Budget Planner

Stop guessing whether your prompt will fit. This planner estimates prompt size, reserves output headroom, and shows how much context you can safely add before the model starts side-eyeing your wall of text.

Best forAI coding sessions, prompt packing, context trimming, and output budgeting

OutputBudget split, utilization, headroom warnings, and copyable session notes

ModeDark UI, mobile responsive, SEO-ready, self-contained single HTML

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Budget inputs

ready

Model context window

Reserve for output

Reserve for system/instructions

Chars per token estimate

Current prompt characters

Desired context characters

Task summary

Budget notes

Optional context chunks

trim or include

Use the chunk list to decide what earns tokens. Shorter chunks are cheaper; high-value chunks should be sent first.

Budget summary

output

Prompt tokens—

Available tokens—

Safe context room—

Utilization—

Budget bar

Waiting for calculation.

Generated plan

copyable

Load a sample or enter your own numbers to generate a token budget plan.