AI API Cost Calculator

Frequently Asked Questions

How accurate are the preset prices?

Prices shown reflect published rates as of 2025. AI model pricing changes frequently, sometimes with short notice. Always verify current rates on the provider's official pricing page before committing a budget.

What counts as an input token?

Every token sent to the model counts: the system prompt, the user message, any retrieved context, and the full conversation history for multi-turn chats. Only the model's response counts as output tokens.

Does streaming affect cost?

No. Streaming returns tokens incrementally but you pay for the same total count whether the response is streamed or returned all at once.

How many tokens is my text?

A rough rule for English: tokens ≈ words × 1.3, or characters ÷ 4. Code and non-English languages tokenize differently. Use the provider's tokenizer playground for precise counts.

Are caching and batch discounts included?

No - this calculator uses standard on-demand rates. If you use prompt caching or batch APIs, your actual bill will be lower. Treat this estimate as an upper bound.

Provided by AllCalculators.io
Free online calculators for everyday. No registration required.

Estimates for informational purposes only.

Important Disclaimer: Estimates for informational purposes only.

This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.

JavaScript is required to use the interactive calculator above. The questions and answers below remain readable without JavaScript.

How It Works

AI language model APIs bill by the token - a unit roughly equal to four characters or three-quarters of an English word. Providers charge two distinct rates: a lower price for input tokens (your prompt, system message, and conversation history) and a higher price for output tokens (the model's generated response). Both rates are quoted per 1,000 or per 1,000,000 tokens.

This calculator multiplies your daily request count by the average token counts per request, converts to millions of tokens, applies the input and output prices separately, and rolls the daily cost forward to monthly (30 days) and annual (365 days) projections. Select a preset model to populate current prices automatically, or enter custom prices for any other provider or model.

Use Cases

Typical developer scenarios where this calculator helps:

Budgeting a new AI-powered feature before launch to ensure it fits within a cost envelope

Comparing two models - for example, GPT-4o versus GPT-4o mini - to quantify the cost-quality trade-off

Evaluating whether prompt caching or a batch API could materially reduce a bill

Planning capacity for a production chatbot with known daily active users and turn counts

Detecting cost spikes early by comparing projected versus actual spend

Tips

Keep these practices in mind when estimating and managing AI API costs:

Output tokens are typically 3-10 times more expensive per token than input tokens; a verbose model response dominates the bill even with a long prompt.

Prompt caching (available on Anthropic and OpenAI) stores repeated system prompts and re-bills cached portions at a fraction of the standard input rate.

The Batch API on OpenAI and Anthropic reduces prices roughly 50% for non-real-time workloads - ideal for bulk analysis or overnight jobs.

Routing simple queries to a cheaper model (GPT-4o mini, Claude 3 Haiku) while reserving powerful models for complex tasks can halve overall spend with minimal quality loss.

Multi-turn conversations re-send all prior turns as input on each call; token counts grow with conversation length, so monitor average context size in production.

FAQ