AI Token Counter & Cost Calculator
Estimate token count and API cost for GPT-4o, Claude, Gemini & more
Drag to estimate your expected output length
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Cost Breakdown
Note: Token counts are estimated using a heuristic algorithm and may differ slightly from actual API token counts. Pricing is based on published rates as of July 2026. Always verify with the official API tokenizer for critical calculations.
How to Use This Token Counter
- 1.Paste your prompt, text, or code into the input box above.
- 2.Select the AI model you plan to use (GPT-4o, Claude 3.5, Gemini, etc.).
- 3.Adjust the output token slider to estimate your expected response length.
- 4.Review the token count, context window usage, and estimated cost.
- 5.Copy the results with one click for your records or team sharing.
Why Token Counting Matters for API Costs
Every API call to an LLM (Large Language Model) is billed based on token usage. Tokens are chunks of text that the model processes - they are not the same as words or characters. Understanding your token usage is critical for:
- • Budgeting your AI project costs before deployment
- • Optimizing prompts to reduce unnecessary token waste
- • Comparing costs across different models (GPT-4o vs Claude vs Gemini)
- • Avoiding context window overflow errors
- • Setting usage limits and alerts for your application
Supported AI Models
| Model | Context Window | Input $/M | Output $/M |
|---|---|---|---|
| GPT-4o | 128K | $2.50 | $10.00 |
| GPT-4o mini | 128K | $0.15 | $0.60 |
| Claude 3.5 Sonnet | 200K | $3.00 | $15.00 |
| Claude 3.5 Haiku | 200K | $0.80 | $4.00 |
| Gemini 2.0 Flash | 1M | $0.10 | $0.40 |
| DeepSeek V3 | 64K | $0.27 | $1.10 |
Prices updated July 2026. Visit official pricing pages for the most current rates.
FAQ
How accurate is this AI token counter?
Our token counter uses a heuristic algorithm calibrated against the GPT BPE tokenizer. For English text, estimates are typically within 5-10% of actual token counts. For Chinese and other CJK languages, estimates may vary by 10-15%. We recommend verifying with the official API tokenizer for production-critical calculations.
How are API costs calculated?
API costs are calculated using the formula: (tokens / 1,000,000) × price per million tokens. Input and output tokens are priced separately. We use the latest published pricing from OpenAI, Anthropic, Google, and DeepSeek as of July 2026. Volume discounts and batch API pricing are not included.
What is a context window?
A context window is the maximum number of tokens (input + output) that a model can process in a single request. For example, GPT-4o has a 128K context window, meaning the combined input and output cannot exceed 128,000 tokens. Exceeding this limit will result in an API error.
How many characters are in one token?
For English text, 1 token approximately equals 4 characters or 0.75 words. For Chinese text, 1 token approximately equals 1.5 characters. Code and special characters may have different token ratios. This is why a dedicated token counter is more accurate than simple character counting.
Is this tool free to use?
Yes, this AI token counter is completely free. No signup, no API key, no limits. All calculations happen in your browser - your text never leaves your device.