Free LLM prompt cost estimator — calculate API spend for GPT, Claude, Gemini, and more before you send.
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The QuickToolz Prompt Cost Estimator calculates the exact USD cost of any prompt + expected completion across every major LLM — OpenAI, Anthropic, Google, Mistral, DeepSeek, and Meta. Pick your model, paste your prompt, set expected output length, and see input cost, output cost, and total cost instantly.
LLM bills can balloon quickly — a few cents per call multiplied by thousands of users per day becomes meaningful infrastructure spend. Estimating up-front lets you choose the right model, cache aggressively, and design prompts that fit your budget.
Everything you need, nothing you don’t. Built for speed and simplicity.
Public list prices for every major provider.
See cost per million tokens for both sides.
Multiply by daily request volume to project monthly spend.
Everything you need, nothing you don’t. Built for speed and simplicity.
GPT-5, GPT-4o, Claude 3.5 Sonnet, Gemini Pro, and more.
Got questions? We’ve got answers. Common questions about LLM Prompt Cost Estimator.
Input tokens are counted live.
Estimate completion length and see total cost.
Prompt cost estimator
Input $2.5/M • Output $10/M • Context 128k
Pricing snapshot
Prices reflect vendor list rates as of May 2026. Always verify with the vendor's official pricing page before committing to production volumes.