calculators · checked 2026-06-29

AI API Cost Calculator

Estimate monthly AI API spending from requests, input tokens, output tokens, and model rates.

Answer

What to know first

API costs usually come from input tokens, output tokens, request volume, and model selection.

Use conservative estimates for output tokens. Long answers and tool calls can make real usage much higher than a simple prompt test.

Before making a budget decision, replace example rates with verified current official model rates.

Local calculator

Requests per day Input tokens/request Output tokens/request Input $/1M tokens Output $/1M tokens

$0.00 / month

Example rates are for planning. Check the linked official pricing pages before making a budget decision.

Structured answer

Variable	What it means	Why it matters
Requests per day	How many times the workflow calls the model	Small automations become expensive when they run repeatedly.
Input tokens	Prompt, context, files, and retrieved text	Long context can dominate costs.
Output tokens	Generated answer length	Output tokens are often priced differently from input tokens.
Model rate	Cost per 1M tokens	Premium models can change the economics of a page or tool.

Source trail

FAQ

Should I calculate with average or worst-case usage?

Use both. Average tells you expected cost; worst case tells you whether automation can run away.