How to Count AI & LLM Tokens and Estimate API Costs Online§
Managing context window limits and optimizing API expenditure when building Large Language Model (LLM) applications requires accurate token estimation.
The NexaTools AI Token Counter calculates exact BPE (Byte Pair Encoding) token counts and estimates API costs.
Supported Models & Features§
- Multi-Model Support: Tokenize text for GPT-4o, Claude 3.5, Gemini 1.5, and open-source Llama 3.
- Real-Time Cost Calculator: Estimate prompt input and response output pricing in USD.
- Privacy First: Prompts are calculated client-side in memory and never sent to external servers.
How to Count Tokens§
- Open the NexaTools AI Token Counter.
- Paste your prompt or system instructions.
- View total token count, character ratio, and estimated API cost breakdown.