AI Prompt Token Cost Calculator

Estimate the cost of AI API calls based on input/output token usage across popular models.

~750 words ≈ 1,000 tokens. A typical prompt is 100–2,000 tokens.
A short reply ≈ 100–500 tokens; a long essay ≈ 1,000–4,000 tokens.

Formula

Input Cost per Request = (Input Tokens ÷ 1,000) × Input Price per 1K Tokens

Output Cost per Request = (Output Tokens ÷ 1,000) × Output Price per 1K Tokens

Total Cost per Request = Input Cost per Request + Output Cost per Request

Total Cost = Total Cost per Request × Number of Requests

Example: 500 input tokens + 300 output tokens × 1,000 requests on GPT-4o mini:
Input = (500/1000) × $0.00015 = $0.000075/req → $0.075 total
Output = (300/1000) × $0.0006 = $0.00018/req → $0.18 total
Grand Total = $0.255

Assumptions & References

More Calculators

Browse All 1861 Free Calculators at National Calculator Authority

Read Next

How to Get Help for Vibe Coding This page covers the primary barriers practitioners encounter when seeking assistance, the criteria for evaluating qualified... Vibe Coding: Frequently Asked Questions The term was popularized by Andrej Karpathy in a February 2025 post, and it has since become a recognized category in... Vibe Coding Tools and Platforms: A Complete Reference This reference catalogs the major platform categories, their underlying mechanics, classification boundaries, and known tradeoffs.