LLM Token Calculator
Calculate tokens and estimate API costs for all major language models
Text Input
Quick Cost Estimates
Context Windows
Model Pricing Comparison
| Model | Provider | Context | Input / 1M | Output / 1M | Your Cost |
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When to Use Token Calculator
Cost Estimation
Calculate API costs before running expensive operations. Estimate budget for production applications and optimize spending
Prompt Engineering
Optimize prompts to fit within token limits while maintaining quality. Test different prompt variations for efficiency
Document Processing
Check if documents fit within model context windows. Determine if you need to split large texts into smaller chunks
Model Comparison
Compare costs across different models to choose the most cost-effective option for your use case
Chatbot Development
Design conversation flows that stay within token budgets. Monitor token usage for multi-turn conversations
Learning & Research
Understand how different models tokenize text. Study the relationship between text length and token count
Frequently Asked Questions
What is a token in the context of Large Language Models?
A token is a basic unit of text that language models process. It can be a word, part of a word, or punctuation. For example, "running" might be one token, while "ChatGPT" could be split into multiple tokens. On average, 1 token is approximately 4 characters in English or 0.75 words. Understanding tokens is crucial because LLM APIs charge based on token count.
Why is understanding token count important?
Token count is important for several reasons: 1) API costs are calculated per token, so knowing your token usage helps estimate expenses, 2) Models have maximum token limits (context windows) that constrain how much text you can process at once, 3) Response quality can depend on efficient token usage, and 4) Token counting helps optimize prompts to reduce costs while maintaining effectiveness.
How accurate is this token calculator?
Our calculator uses estimation methods that provide accurate approximations for most use cases. The estimates are based on standard tokenization patterns: roughly 4 characters per token for English text. For precise token counts, especially for non-English languages or special characters, refer to the official tokenizer tools provided by each AI provider.
Does token count differ between models?
Yes, different models use different tokenizers and may count tokens differently for the same text. GPT models use the tiktoken encoding, Claude uses its own tokenizer, and Gemini has its own system. However, the differences are usually minor for standard English text. Our calculator provides estimates that work well across most models.
How are API costs calculated?
API costs are calculated based on the number of input and output tokens used. Most providers charge per 1 million tokens, with different rates for input (prompt) and output (completion) tokens. Some models also offer discounted rates for cached content. Our calculator shows the cost per token and total estimated cost for different models based on current pricing.
What is the context window or token limit?
The context window is the maximum number of tokens a model can process in a single request, including both input and output. For example, GPT-4 has a 128K token context window, while Claude Opus supports up to 200K tokens. If your text exceeds this limit, you'll need to split it into smaller chunks or use a model with a larger context window.
Is this token calculator free to use?
Yes, our token calculator is completely free to use with no registration required. You can calculate unlimited tokens and estimate costs for all major LLM models without any fees. Your data is processed locally in your browser and never sent to our servers.
Which AI models are supported?
Our calculator supports all major LLM providers including OpenAI (GPT-5, GPT-4o, GPT-4.1), Anthropic (Claude 4.5 Sonnet, Claude 4.5 Haiku, Claude 4.5 Opus, Claude 4), Google (Gemini 2.5, Gemini 2.0), and other popular models. We regularly update pricing information to reflect the latest rates from each provider.
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