Will It Fit? Context Checker
Check if your document fits a model's context window in one call.
Results update automatically as you type.
Result
Yes — it fits in one call
53,000 tokens needed vs 128,000 tokens window
- Document
- 50,000 tokens
- Prompt / instructions
- 1,000 tokens
- Reserved for output
- 2,000 tokens
- Total needed
- 53,000 tokens
- Context window
- 128,000 tokens
- Docs of this size per call
- 2
Pasting a long document into a model? Enter its token size, your prompt and the output you need, then pick a model to see whether it fits in a single call — and how many documents of that size you could fit.
How this is calculated
This calculator uses the tokens formulas described in our methodology. All figures are estimates for planning; verify current pricing with each provider before relying on them.
Worked example (defaults)
With the default inputs above, here is the result:
Result
Yes — it fits in one call
53,000 tokens needed vs 128,000 tokens window
- Document
- 50,000 tokens
- Prompt / instructions
- 1,000 tokens
- Reserved for output
- 2,000 tokens
- Total needed
- 53,000 tokens
- Context window
- 128,000 tokens
- Docs of this size per call
- 2
Frequently asked questions
What if my document doesn't fit?+
Chunk it and use RAG, summarize sections first, or switch to a larger-context model like Gemini or Claude.
How many tokens is my document?+
Roughly characters ÷ 4 for English prose. Use our Token Counter for a closer estimate.