ChatGPT API Cost Calculator
Calculate the cost of using ChatGPT API based on token usage and model selection.
Input Values
Results
Monthly Input Tokens
1,500,000 tokens
Monthly Output Tokens
3,000,000 tokens
Total Monthly Requests
3,000 requests
Estimated Monthly Cost
$2.03
Based on current OpenAI pricing (February 2026)
Cost per Request
$0.0007
Average cost for each API call
Share your results
Estimate your monthly OpenAI API costs before you start building. This calculator helps developers and businesses understand ChatGPT API pricing based on actual usage patterns.
Enter your expected number of requests, average tokens per request, and select your model to get an accurate cost estimate.
How This Calculator Works
- Select your model - Different GPT models have different pricing
- Enter your usage - Estimate requests per day and average tokens
- Get instant estimate - See your projected monthly cost
The calculator uses OpenAI's official pricing:
- Input tokens: What you send to the API
- Output tokens: What the API returns (usually costs 2-4x more)
Pricing Formula
Monthly Cost = (Input Tokens x Input Price + Output Tokens x Output Price) / 1,000,000
Current Prices (per 1M tokens, February 2026)
| Model | Input | Output | |-------|-------|--------| | GPT-4o (2024-11-20) | $2.50 | $10 | | GPT-4o Mini (2024-07-18) | $0.15 | $0.60 |
Pro Tips
- โข GPT-4o Mini offers the best value for most applications
- โข Reduce costs by caching common responses
- โข Use shorter system prompts to reduce input tokens
- โข Consider batch API for non-real-time workloads (50% cheaper)