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A/B Testing Token Usage (Monthly) Calculator

Estimate the monthly input, output and total AI token usage and API cost for an A/B test.

Your Details

Overview

Use this A/B testing token usage calculator to estimate monthly AI token volume and token-based API cost. Enter expected test participants, request frequency, average prompt and response size, variant count, and your current input and output token prices.

How it works

The calculator first multiplies monthly participants by requests per participant to estimate total test requests. It then multiplies that request count by average input and output tokens to calculate each token category. Total tokens are the sum of input and output tokens. Estimated cost is calculated separately for input and output tokens using the entered price per million tokens, then added together. The per-variant figure assumes an equal traffic split.

How to use this calculator

  1. 1Enter the expected number of participants exposed to the test each month.
  2. 2Add the average number of AI requests each participant is likely to make.
  3. 3Enter average input and output tokens for a typical request.
  4. 4Set the number of control and treatment variants.
  5. 5Add your provider's input and output prices per one million tokens.
  6. 6Review the monthly token estimate and projected token API cost.

Example Calculation

Monthly test participants

10000

Requests per participant

3

Number of variants

2

Average input tokens per request

800

Average output tokens per request

400

Input price per 1 million tokens

$3

Output price per 1 million tokens

$15

Estimated monthly token usage

36,000,000 tokens

With 10,000 participants making three requests each, the test makes 30,000 requests and uses about 36,000,000 total tokens monthly. At the example prices, the estimated token API cost is $252.00.

Frequently asked questions

How do I calculate token usage for an A/B test?

Multiply the number of test participants by average requests per participant, then multiply the result by average input and output tokens per request. Add the two token totals for combined usage.

Does adding A/B test variants automatically increase total token use?

Not necessarily. If each participant is assigned to only one variant and overall traffic stays the same, total token use is mainly driven by requests and token size. Variants divide traffic between experiences; they do not inherently multiply it.

Why are input and output tokens priced separately?

Many AI providers charge different rates for tokens sent in prompts and tokens generated in responses. Calculating them separately gives a more useful cost estimate.

What should I include in input tokens per request?

Include system instructions, user messages, conversation history, retrieved documents, tool context and any other text sent to the model.

Why might actual token usage be higher than this estimate?

Usage can rise because of longer conversations, retries, larger retrieval contexts, unexpected traffic, tool calls, multiple model passes or output responses that are longer than average.

Does this calculator include cached-token discounts or other provider charges?

No. It estimates standard input and output token charges from the prices you enter. Add separate allowances for caching, tools, storage, batch processing or other billable features if applicable.

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Assumptions and warnings

Assumptions

  • Each participant makes the stated average number of requests during the month.
  • Each request uses the entered average input and output token counts.
  • Participants are allocated evenly across variants when calculating average tokens per variant.
  • Costs include only input and output token charges and are estimates based on the prices entered.
  • The calculation does not include fixed platform fees, tool calls, caching, retries, storage or taxes.

Warnings

  • This calculator provides a usage and cost estimate only; actual provider billing can differ because of model settings, caching, rounding, retries and pricing changes.
  • Check your provider's current pricing and token accounting before setting a production budget.