Calculator Inputs
Enter current prompt metrics and benchmark targets. Larger screens use three columns, smaller screens use two, and mobile uses one.
Formula Used
The calculator combines outcome quality, operational economy, execution speed, and prompt design into one weighted score.
| Estimated Cost | (Prompt Tokens + Response Tokens) / 1000 × Cost per 1,000 Tokens |
|---|---|
| Outcome Index | (Success Rate × 0.50) + (Accuracy × 0.30) + (Consistency × 0.20) |
| Token Index | min(100, Benchmark Tokens / Total Tokens × 100) |
| Cost Index | min(100, Benchmark Cost / Estimated Cost × 100) |
| Economy Index | (Token Index × 0.50) + (Cost Index × 0.50) |
| Speed Index | min(100, Benchmark Latency / Actual Latency × 100) |
| Iteration Index | min(100, Benchmark Iterations / Actual Iterations × 100) |
| Execution Index | (Speed Index × 0.60) + (Iteration Index × 0.40) |
| Design Index | (Clarity Score × 0.50) + (Reusability Score × 0.50) |
| Prompt Efficiency Score | (Outcome × 0.40) + (Economy × 0.25) + (Execution × 0.20) + (Design × 0.15) |
How to Use This Calculator
- Enter prompt and response token counts from a recent run.
- Add measured success, accuracy, consistency, clarity, and reusability scores.
- Provide average latency, cost per 1,000 tokens, and iterations required.
- Set benchmark values representing your target or current best prompt.
- Click Calculate Score to display the result above the form.
- Review the breakdown table, graph, and optimization notes.
- Download the CSV or PDF summary for reporting and comparisons.
Example Data Table
This sample shows one realistic benchmark comparison for a strong prompt setup.
| Scenario | Prompt Tokens | Response Tokens | Success % | Accuracy % | Latency (s) | Estimated Cost ($) | Score | Grade |
|---|---|---|---|---|---|---|---|---|
| Support Automation Prompt | 650 | 900 | 92 | 88 | 6.5 | 0.0186 | 93.54 | A+ |
| Verbose Drafting Prompt | 1200 | 1600 | 82 | 79 | 11.2 | 0.0336 | 72.11 | C+ |
| Template-Based Summary Prompt | 500 | 700 | 89 | 86 | 5.4 | 0.0144 | 91.08 | A+ |
8 FAQs
1) What does this calculator measure?
It measures how efficiently a prompt produces useful results relative to cost, speed, token usage, consistency, and prompt design quality.
2) Why are benchmark values required?
Benchmarks create a comparison target. Without them, token, cost, latency, and iteration efficiency cannot be normalized into meaningful index scores.
3) What is a good Prompt Efficiency Score?
Scores above 90 are excellent, 75 to 89 are strong, 60 to 74 are moderate, and below 60 usually signal costly or inconsistent prompt design.
4) Can I use this for different AI tasks?
Yes. It works for summarization, coding, support, research, classification, and content generation, as long as you measure quality and set suitable benchmarks.
5) Why does a shorter prompt sometimes score better?
Shorter prompts often reduce token cost and latency. However, they only improve the score when accuracy, consistency, and task success remain strong.
6) Should I always optimize for the highest score?
Not always. Some business tasks justify higher cost or latency for better accuracy, safety, or completeness. Use the score as a decision aid.
7) What lowers the score most often?
The common causes are too many tokens, slow responses, repeated retries, vague instructions, and prompts that do not transfer well across similar tasks.
8) How can I improve prompt efficiency quickly?
Clarify the goal, tighten output rules, remove redundant context, add one good example, and compare versions with controlled benchmark testing.