Calculators

ChatGPT Prompt Cost Calculator

Estimate ChatGPT prompt token usage, API cost per request, monthly cost, and savings from shorter prompts.

ChatGPT Cost Tool

ChatGPT Prompt Cost Calculator

Estimate prompt token usage, cost per request, monthly API cost, and possible savings from shorter prompts. Use this for ChatGPT-style apps, AI tools, content workflows, and API budget planning.

Prompt input

Paste a prompt to estimate tokens. You can also override the input token count manually.

Prompt text

Token count is an estimate. Actual tokenization can differ by model and language.

Model

Lower-cost model for high-volume prompts, tools, and general workloads.

Manual input tokens

tokens

Optional. Leave blank to use the text estimate.

Expected output tokens

tokens

Cached input tokens

tokens

Use 0 if you are not using prompt caching.

Requests per day

requests

Usage days per month

days

Local currency

Choose the currency you want to use for the local estimate.

USD to local currency rate

Enter how much 1 USD is worth in your selected local currency. Examples: KRW 1400, JPY 155, EUR 0.92.

Prompt cost results

These estimates use the selected model price per 1 million tokens.

Cost per prompt

$0.00362

Input + cached input + output cost

Monthly API cost

$10.8585

100 requests/day × 30 days

Monthly cost in USD

$10.86

Rate: 1 USD per $1

Yearly API cost

$130

Monthly cost × 12

Yearly cost in USD

$130.30

Yearly cost converted to selected local currency

Estimated input tokens

Estimated from prompt text

Prompt characters

128

19 words detected

Monthly token volume

2,478,000

Input + cached input + output tokens

Prompt savings simulator

See how much you could save by shortening repeated prompt text while keeping the same output size.

Prompt reduction

Example: 20 means the input prompt becomes 20% shorter.

Reduced input tokens

20% shorter input prompt

Monthly savings

$0.0117

Estimated monthly cost reduction

Monthly savings in USD

$0.01

Converted to selected local currency

Yearly savings

$0.1404

Monthly savings × 12

Yearly savings in USD

$0.14

Converted to selected local currency

Model price breakdown

Current constants are based on standard pricing per 1 million tokens. Update the constants if model pricing changes.

Input price

$0.75 / 1M tokens

Prompt and input tokens

Cached input price

$0.075 / 1M tokens

Cached prompt tokens when applicable

Output price

$4.50 / 1M tokens

Generated answer tokens

Prompt cost formulas

Input cost

Input tokens ÷ 1,000,000 × input price

Output cost

Output tokens ÷ 1,000,000 × output price

Monthly cost

Cost per prompt × requests per day × usage days

This calculator gives estimates only. Actual API cost can vary based on model, exact tokenization, prompt caching, tools, retries, service tier, taxes, and pricing changes.

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What this ChatGPT prompt cost calculator helps you estimate

This ChatGPT prompt cost calculator helps developers, creators, and teams estimate the cost of running repeated AI prompts.

It estimates input tokens from pasted text, combines that with expected output tokens, and applies model pricing per 1 million tokens.

The tool is useful for planning AI apps, content workflows, support bots, automations, and internal tools.

It can also estimate savings from reducing prompt length, which is helpful for high-volume API usage.

The results are estimates only. Actual costs can vary by model, exact tokenization, caching, tools, retries, service tier, taxes, and pricing changes.

Common uses for a ChatGPT prompt cost calculator

Estimating ChatGPT API cost per prompt
Planning monthly OpenAI API budget
Estimating token usage from prompt text
Comparing prompt cost across models
Calculating savings from shorter prompts
Budgeting AI workflows for websites, apps, and automations

Common ChatGPT prompt cost examples

A long repeated system prompt can increase monthly API cost at high request volume

Reducing input prompt length by 20% can reduce input-token cost for repeated prompts

Monthly cost depends on input tokens, output tokens, model price, requests per day, and usage days

How this ChatGPT prompt cost calculator works

Paste a prompt to estimate input tokens from the text.

Choose an AI model and enter expected output tokens, requests per day, and usage days per month.

The calculator estimates cost per prompt, monthly API cost, yearly API cost, and local-currency cost.

Use the savings simulator to estimate how much shorter prompts could reduce monthly and yearly costs.

Frequently Asked Questions

How do you estimate ChatGPT prompt cost?

Estimate input tokens and output tokens, divide each by 1,000,000, then multiply by the selected model's token prices. Multiply cost per prompt by request volume to estimate monthly cost.

Is the token estimate exact?

No. This calculator estimates tokens from text. Actual token counts can vary by model, tokenizer, language, formatting, and API features.

Can shorter prompts reduce API cost?

Yes. If a repeated prompt is shorter, input-token cost can decrease, especially for high-volume applications.

Are ChatGPT subscription and API costs the same?

No. ChatGPT subscriptions are separate from API usage. API costs are usually billed by token usage for apps, websites, or developer projects.

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ChatGPT Prompt Cost Calculator