Welcome to the Token Cost Calculator
This minimalist utility lets you estimate how much each message—or an entire 30‑message conversation—costs when using an LLM. Just enter your model’s input and output token prices plus your typical total‑token count. We assume completions account for a fixed 35 % of total tokens.
How it works
The calculator uses two equations:
Average price per token
p_avg = ((1 - 0.35) × P_in + 0.35 × P_out) / 1,000,000
where P_in and P_out are your per‑million prices for prompt and completion tokens.
Cost per message
cost_msg = T × p_avg
with T being the total tokens (prompt + completion) in a single exchange.
You can multiply the per‑message figure by the number of turns to price entire conversations automatically.