Convert token volume and cost per 1K tokens into an estimated API spend.
Overview
LLM APIs bill by tokens. Planning cost means multiplying usage by the published rate for the model and direction (input vs output).
Enter tokens and cost per 1,000 tokens. Estimated cost = (tokens ÷ 1000) × rate.
Blend input and output rates outside the tool if your traffic mix uses different prices.
Steps
Prompt plus completion tokens for the period.
Vendor rate for the model/direction.
Review estimated cost.
Multiply tokens for monthly projections.
Swap rates for cheaper or larger models.
Math
estimatedCost = (tokens / 1000) × costPer1k
Cost scales linearly with tokens at the per-1K price.
Worked cases
500×0.002 = $1.00
$1.00 estimated cost.
5,000×0.002 = $10
$10 estimated cost.
500×0.01 = $5
$5 estimated cost.
Why use this
Questions