AI Calculators
Last updated: October 2026
LLM API Cost Calculator
Work out what an LLM API workload costs from input tokens, output tokens and the number of requests, priced at current OpenAI, Anthropic Claude and Google Gemini list prices.
AI Token Counter
Estimate how many tokens a text uses in OpenAI GPT, Anthropic Claude, Google Gemini and Meta Llama models from its word or character count, using each provider’s published rule of thumb.
ChatGPT vs Claude API Cost
Price the same workload on OpenAI GPT (the models behind ChatGPT) and Anthropic Claude side by side, with Gemini for reference, counting the extra tokens Claude’s tokenizer uses for the same text.
AI API Monthly Budget Calculator
Turn daily request volume and average prompt and reply length into a monthly AI API bill, cost per request, per day and per year, at current GPT, Claude and Gemini prices.
Context Window Calculator
See how many words, pages or lines of code fit in a model’s context window, and what share of it a document of a given length uses, for Claude, GPT-6, Gemini and Llama.
Prompt Caching Savings Calculator
Estimate what prompt caching saves on a repeated prompt prefix: cache-write premium, cache-read discount and the number of requests, with the break-even point, for Claude, GPT and Gemini.
Batch API Savings Calculator
See how much the Batch API saves on a large LLM job: the same requests processed asynchronously at a discount (50% at OpenAI, Anthropic and Google), with the batch cost per request.
LLM VRAM Calculator
Estimate the GPU memory (VRAM) needed to run a large language model locally: weights at FP16, INT8 or 4-bit, plus the KV cache for your context length and batch size, plus overhead.
Tokens per Second Calculator
Work out how long a model takes to write a response from the output length, generation speed in tokens per second and time to first token, with the words-per-minute equivalent.
AI Subscription vs API Calculator
Compare a monthly AI chat subscription such as ChatGPT Plus or Claude Pro with paying per token through the API for the same usage, and find the break-even number of messages.