AI Prompt Grader
Paste any prompt and get an instant score out of 100 — with a breakdown of role, context, constraints, and format, plus the exact fixes to make it better.
What we grade — and why it matters
The model is the same engine for everyone. What changes the output is what you put in front of it. Every great prompt is built from four parts:
Role
Who you tell the AI to be. "Act as a senior strategist" beats no role every time — it sets the expertise and voice.
Context
Your real situation: audience, goal, budget, constraints. Without it the AI defaults to safe and generic.
Constraints
What to prioritize and what to rule out. This is the difference between a wandering answer and a focused one.
Format
Exactly how to deliver the output — a numbered plan, a table, a template. The difference between advice and a deliverable.
About the free AI prompt grader
The TopAIPrompts prompt grader is a free tool that scores how well any ChatGPT prompt, Claude prompt, or Gemini prompt is engineered. Paste a prompt and you get an instant 0-100 rating, a per-dimension breakdown of role, context, constraints, and format, and concrete, paste-ready fixes that raise the score. It's the fastest way to learn prompt engineering — you see exactly which part of your prompt is letting the output down. You get 12 free grades per day with no signup. When you'd rather not engineer prompts by hand, try the free AI prompt generator to get a high-scoring prompt for your goal, or browse the free prompt library to see the quality firsthand.
Frequently Asked Questions
What is an AI prompt grader?
An AI prompt grader analyzes a prompt and scores how well it's engineered to get a high-quality result from an AI model like ChatGPT, Claude, or Gemini. Instead of guessing whether your prompt is good, you paste it in and get a 0-100 score broken down across the four things that actually move output quality: role, context, constraints, and format — plus specific fixes.
How is the score calculated?
Every prompt is graded on four dimensions, each worth up to 25 points. Role: does it tell the AI who to be? Context: does it supply your real, specific situation? Constraints: does it tell the AI what to prioritize and rule out? Format: does it specify exactly how to deliver the output? A vague one-line question usually scores under 35; a fully engineered prompt scores 85 or higher.
Is the prompt grader really free?
Yes. You get 12 free grades per day with no signup or credit card required. Each grade includes the full breakdown and concrete suggestions for improvement. If you'd rather skip engineering prompts yourself, our generator and packs ship prompts that already score in the 90s.
Does it work for ChatGPT, Claude, and Gemini prompts?
Yes. The grader evaluates the universal qualities of a well-engineered prompt — role assignment, context, constraints, and output format — which improve results on every major model, including ChatGPT (GPT-4o), Claude (Sonnet and Opus), and Gemini. The same engineered prompt works across all of them.
What should I do after I get my score?
Apply the fixes listed under your score — they're written to be pasted straight into your prompt. Re-grade to see the score climb. If you'd rather not do it manually, use our free AI prompt generator to produce a tailored, high-scoring prompt for your exact goal, or browse our packs of pre-engineered prompts.