Input cost
Input cost is based on what you send to the model: prompt text, instructions, context, and any repeated workflow calls.
Prompt cost calculator
Prompt Cost Calculator
Estimate how much an AI prompt could cost based on prompt size, expected answer length, pricing profile, and usage volume.
Calculator
Estimate your AI prompt cost
Paste a prompt, choose an example pricing profile, and estimate cost per prompt run, per day, and per month.
Quick examples
Input tokens are what you send to the AI model. Output tokens are what the model returns. API providers often price them separately.
Advanced settings
Prices are manual for now. Example: if your provider charges $2 input and $10 output per 1M tokens, enter 2 and 10.
Energy usage is a rough estimate. Actual energy depends on model, hardware, provider, datacenter efficiency, workload, and region.
Output cost
Output cost is based on what the model returns. Longer answers can cost more even when the prompt is short.
Cost per prompt run
PromptMeter combines estimated input tokens, expected output tokens, and manual example prices to estimate one run.
Monthly AI cost
Daily runs and days to estimate turn one prompt run into a rough monthly usage budget.
Example pricing profiles
Profiles are examples only, not official provider prices. Always verify real prices with your AI provider.
Simple monthly example
If one prompt costs only a fraction of a cent, it can still become meaningful when multiplied by daily runs, workflow steps, and days per month.
Prompt cost vs API cost
Prompt cost estimates one repeated prompt or workflow step. API cost planning adds users, requests, AI calls, and product-level monthly volume.
Same input, different output length
An 800-token input can cost very differently if the model returns 250, 750, 1,500, or 3,000 output tokens.
Manual pricing disclaimer
Do not treat the example profiles as provider pricing. Replace them with your own input and output prices before making decisions.
Same input, different output length
| Scenario | Input tokens | Output tokens | Cost behavior |
|---|---|---|---|
| Short answer | 800 | 250 | Output stays controlled |
| Medium answer | 800 | 750 | Balanced prompt and answer cost |
| Long answer | 800 | 1,500 | Output can become the main cost |
| Very long answer | 800 | 3,000 | Output dominates and monthly cost rises quickly |
Use the Output Token Cost Calculator to compare these scenarios with your own prices.
FAQ
Prompt cost calculator FAQ
How is prompt cost calculated?
The calculator multiplies estimated input and output tokens by the manual price per 1M tokens, then scales by usage volume.
Are the pricing profiles official prices?
No. They are example profiles to make the calculator usable quickly. Replace them with your provider’s real prices.
How can I reduce prompt costs?
Shorter prompts, shorter expected answers, fewer repeated calls, and lower-cost model choices can reduce estimated spend.
Why can output cost become large?
A compact prompt that asks for a long report, many JSON rows, or detailed analysis can spend more on output than input.