About LLM-Calculator.com

Our Mission

LLM-Calculator.com was created to provide developers, researchers, and AI engineers with accurate, privacy-first token counting for Large Language Models. We believe that understanding tokenization is crucial for building efficient, cost-effective AI applications.

Why We Built This

Working with LLM APIs can be expensive, and costs are determined by token count, not character count. We noticed developers often struggled with:

• Accurately predicting API costs before making requests
• Understanding how different models tokenize the same text
• Optimizing prompts to fit within context windows
• Finding reliable, privacy-focused tokenization tools

Our Approach

Privacy First

All tokenization happens in your browser using WebAssembly. Your text never leaves your device, ensuring complete privacy and security. We don't track users, store data, or use analytics cookies.

Accuracy

We use the official tokenization libraries for each model, ensuring our counts match exactly what you'll see when using the actual APIs. No approximations or estimates.

Multi-Model Support

Support for the most popular LLM tokenizers in one tool, making it easy to compare efficiency across different models and make informed decisions.

Supported Models

Educational Content

Beyond the calculator, we provide comprehensive educational resources:

• Expert blog articles on tokenization concepts and best practices
• Cost optimization guides and real-world examples
• Model comparison studies and performance benchmarks
• Prompt engineering techniques for token efficiency

Technical Implementation

Our tool is built with modern web technologies:

• WebAssembly: Native performance tokenization in the browser
• Client-side JavaScript: No server-side processing required
• Official libraries: tiktoken, llama3-tokenizer-js, and other official implementations
• Responsive design: Works on desktop, tablet, and mobile devices

Open Source Philosophy

We believe in transparency and community contribution. While our calculator is free to use, we're committed to sharing knowledge and best practices with the AI development community through our educational content and resources.

Future Plans

We're continuously working to improve and expand our offerings:

• Support for additional LLM models and tokenizers
• Advanced features like batch processing and API integration
• More educational content and interactive guides
• Community-requested features and improvements