Free AI calculators
What do you want to calculate?
Start with the numbers you have. No account needed.
Most used toolTokens to USD
Turn input and output token counts into an estimated API cost. Compare a single token count, or enter separate input and output counts to estimate the total.
Open Tokens to USD →
Words to Tokens
Estimate token counts from text before you send a request.
For a draft prompt or document.
Monthly API Cost
Plan spending from requests per day and tokens per request.
For an app, chatbot, or monthly budget.
Compare Model Prices
Compare input and output rates across your model shortlist.
For choosing between models.
A quick way to check your API cost
- Find input and output token counts in your API response or usage dashboard. A total token count alone cannot identify the split.
- Open Tokens to USD, choose “Input + output,” and enter both counts.
- Find your model and check its rate date. Caching, reasoning, tools, and other billing categories can change the final invoice.