OpenAI GPT API Pricing Calculator

❓ What do “tokens” mean in the calculator?
A token is a small chunk of text used to measure length. It can be as short as one character or as long as one word.
For example, the sentence:
“The cat sat on the mat.” → ~6 words → about 7–8 tokens.
The OpenAI API calculator uses tokens to estimate both input and output costs — and more tokens = higher price.

❓ What does “input tokens per call” mean?
Input tokens are the tokens you send to the AI model (like GPT-4 or GPT-4o) as a prompt.
Example: You send this to GPT → “Write a product description for a red running shoe.” → ~10 words → ~15–20 tokens.
Longer prompts = more input tokens = more cost, which the OpenAI pricing calculator will help estimate.

❓ What are “output tokens per call”?
Output tokens are the tokens the AI generates in its response.
Example: The AI replies → “This red running shoe is lightweight, durable, and perfect for runners.” → ~12 words → ~18–22 tokens.
The GPT API cost calculator adds up input and output tokens to help you understand your total usage costs.

❓ What does “number of API calls” mean?
This is how many times you run the request through the OpenAI API.
Example:

• You run the tool once → 1 API call

• You process 100 product descriptions → 100 API calls
  The calculator estimates costs like this:
  (input tokens + output tokens) × number of API calls,
  helping developers and AI teams track OpenAI API pricing efficiently.

❓ How do I use this GPT cost calculator?

1. Select the OpenAI model (GPT-3.5, GPT-4-turbo, or GPT-4o)

2. Enter the average input tokens per call (ex: 500)

3. Enter the expected output tokens per call (ex: 1,000)

4. Enter the number of API calls (ex: 100)

5. Click Calculate Cost to get your GPT API pricing estimate

❓ What’s the difference between the models?

• GPT-3.5 Turbo: Cheapest, great for chatbots and summaries

• GPT-4 Turbo: Smarter, more accurate, higher pricing

• GPT-4o: Fastest, most capable, and ~50% cheaper than GPT-4-turbo
  This OpenAI price calculator lets you compare these models’ token costs side by side.

❓ Does this calculator reflect my actual OpenAI billing?
No — it’s just an OpenAI API cost estimator. Always monitor your real usage in the OpenAI dashboard and check the official OpenAI Pricing Page for up-to-date rates. You can read more about the pricing and details there.