AI voice agent cost calculator
Four meters run during every AI phone call: telephony, speech-to-text, the LLM, and text-to-speech. Build your stack from real, continuously verified model prices and see what a call actually costs.
Estimates use live prices from the open Hail costs dataset. Share this exact configuration by copying the page URL.
How the estimate works
Telephony and speech-to-text bill on call duration. Text-to-speech bills on the characters the agent speaks — we assume 150 words per minute of conversation with the agent talking 50% of the time, at 5 characters per word. The LLM bills per token: 4 turns per minute, each resending a 1000-token system prompt plus the growing transcript (1.33 tokens per word). All model prices come from the open Hail costs dataset, refreshed daily.
FAQ
How much does an AI phone call cost?
It depends on four meters running at once: telephony (per minute), speech-to-text (per minute of audio), the LLM (per token), and text-to-speech (per character). With a budget stack a five-minute call lands around $0.10–$0.30; premium voices and frontier LLMs push it several times higher. Use the calculator above with your own stack for a real number.
Where do the prices come from?
From the open Hail costs dataset (CC-BY-4.0) — per-model LLM, STT, and TTS prices verified against provider pricing pages and refreshed continuously. The calculator re-fetches it daily.
What assumptions does the estimate make?
A conversational pace of 150 words per minute across both speakers, the agent speaking 50% of the time, 4 LLM turns per minute with a 1000-token system prompt resent each turn, 1.33 tokens and 5 characters per word. Real calls vary — treat results as a planning estimate, not a quote.
Is this calculator free?
Yes — free, no signup, and the underlying dataset is CC-BY-4.0 licensed on GitHub.
More free tools: SMS Length & Segment Calculator · Email Deliverability Checker · all tools