AI Token Cost Calculator
Calculator Inputs
ResultsLive Estimate
Results update automatically as you adjust inputs.
An AI token calculator is an essential planning tool for developers, startups and businesses that integrate large language models into their products. Every API call to models such as OpenAI GPT, Anthropic Claude, Mistral or DeepSeek is billed based on the number of tokens consumed: input tokens (the prompt you send) and output tokens (the response generated). Estimating this consumption before you launch is critical to controlling your infrastructure budget and avoiding surprise invoices. Our simulator lets you enter your typical prompt and response lengths, the volume of requests per day and the model of your choice. It instantly returns the estimated cost per request, per day, per month and per year. The integrated token counter also estimates how many tokens a given text represents, with a tokenizer approximation adapted to the language (English, French or automatic detection). Use it to size your AI integration, compare the pricing of the main providers, and make an informed choice for your production environment.
🧮Methodology & Formula
Methodology & Formula
This simulator works in two modes.
1. Cost estimation. The price of each request is calculated from the provider's public price per million tokens, in euros, as follows:
cost per request = (input price × input tokens + output price × output tokens) / 1,000,000
The daily cost multiplies this by the number of requests per day; the monthly estimate uses a 30-day basis and the annual estimate a 365-day basis. Prices are indicative and based on the public pricing grid in force in 2026. They exclude taxes, discounts, batch pricing, context caching and prompt caching. We invite you to check the official pricing page of each provider.
2. Token counter. The number of tokens is estimated from the number of characters using a tokenizer heuristic:
tokens ≈ characters / characters per token
On average, 1 token represents about 4 characters in English and 3.5 characters in French (accented words are cut more finely by tokenizers). In automatic mode, the presence of accented characters switches the estimate to the French ratio. The real token count depends on the tokenizer of each model and can vary; for precise billing, use the official tokenizer of the provider.