Free AI cost and readiness calculators
Five free tools for planning AI work: estimate ROI, LLM API spend and automation savings, and score how ready your organisation is and how complex the agent you want to build will be.
Perimattic AI Suite has five free calculators for planning AI work. Three put money on it: the AI ROI calculator (payback and 1- and 3-year ROI), the LLM cost calculator (monthly API spend from tokens and request volume) and the AI automation ROI calculator (labour hours and cost freed by automating a task). Two help you scope it: the AI readiness assessment scores five organisational dimensions out of 25, and the AI agent complexity estimator scores six build factors to a complexity tier and timeline band. Each page shows the formula it uses.
3 tools
Cost and return calculators
Use these when someone has to sign off a budget. Each one turns a handful of numbers you already have, such as what a process costs today, what a model charges per million tokens, or how many hours a team spends on a task, into a monthly or annual figure. The arithmetic is shown on each page, so finance can check it line by line.
AI ROI Calculator
Return on a whole AI initiative: savings on a process, less the cost of running the AI, against what it cost to build.
You enter: Current annual process cost, expected cost reduction (%), implementation cost, annual AI operating cost.
You get: Annual savings, net annual benefit, first-year and 3-year ROI, payback period in months.
Open the toolLLM Cost Calculator
Model API spend: tokens per request times requests per month, priced per million input and output tokens.
You enter: Model, average input and output tokens per request, requests per day, working days per month.
You get: Monthly and annual cost, cost per request, input/output cost split, monthly token volume.
Open the toolAI Automation ROI Calculator
Value of automating one recurring task: hours your team gets back, priced at their hourly cost, less tool fees.
You enter: People on the task, hours per week, hourly cost, automation rate (%), tool cost per month, implementation cost.
You get: Annual labour savings, net annual savings, ROI, payback, hours freed per week, FTE equivalent.
Open the tool2 tools
Readiness and scoping tools
Use these before you commit to a build. They are scored questionnaires rather than calculators: you pick the answer that best describes your situation, and the tool adds the points up. The result tells you where the gaps are and which size of project you are looking at, which is often the input you need before the cost tools above give a useful answer.
AI Readiness Assessment
How prepared your organisation is, from five questions scored 1 to 5 each, out of 25.
You enter: Data infrastructure, data quality, technical talent, process maturity, leadership buy-in.
You get: Readiness percentage, a readiness level, per-dimension scores and a next step for your weakest area.
Open the toolAI Agent Complexity Estimator
How hard an AI agent will be to build and run, from six factors scored 1 to 4 each, out of 24.
You enter: Tools and APIs, data sources, decision complexity, human-in-the-loop, compliance, request volume.
You get: Complexity tier (simple to enterprise), a timeline band and an infrastructure cost band.
Open the toolPick a tool
Which tool should you use?
Start from the question you have been asked. Each row names the tool that answers it and the figure you will come away with.
| Your question | Tool | What you get |
|---|---|---|
| Will this AI project pay for itself, and when? | AI ROI Calculator | Payback in months and ROI over one and three years |
| What will our model API bill be each month? | LLM Cost Calculator | Monthly and annual spend, and cost per request |
| Is it worth automating this specific task? | AI Automation ROI Calculator | Hours and FTEs freed, net savings and payback |
| Are we ready to start an AI programme? | AI Readiness Assessment | A score out of 25 and the weakest area to fix first |
| How big a build is the agent we have in mind? | AI Agent Complexity Estimator | Complexity tier, timeline band, infrastructure cost band |
Workflow
How to use the tools together
The five tools answer different questions, but they work best in order. A typical path from idea to approved budget looks like this:
- Check the foundations. Run the AI readiness assessment. If one dimension scores 1 or 2, such as data quality or process maturity, fix that first: a cost model built on a process nobody has documented will not hold up.
- Size the build. Describe the agent or workflow in the agent complexity estimator. The tier and timeline band give you a starting point for implementation cost.
- Price the running cost. Put your expected request volume and prompt sizes into the LLM cost calculator. The monthly figure, times twelve, is the model part of your annual operating cost.
- Make the case. Feed implementation and operating cost into the AI ROI calculator, or use the AI automation ROI calculator if the benefit is hours saved on a specific task.
What the tools do not do
None of the calculators knows your business. They do not adjust for ramp-up time, staff turnover, discount rates or currency, and the two scored tools put your answers into fixed bands. Use the results to compare options and to frame a conversation, then check them against real data. Once a system is in production, LLM observability and cost tracking gives you measured token cost per request, per feature and per user to compare with your estimate.
FAQ
Frequently asked questions
Are the Perimattic AI Suite calculators free?
Yes. All five tools are free to use and you can enter and change your numbers as often as you like. To see the full results we ask for a name and work email, so a Perimattic engineer can follow up if you want help. There is no charge and no account to create.
Which AI calculator should I start with?
Start with the AI readiness assessment if you have not picked a use case yet, because it shows which foundations are missing. If you already have a use case, use the AI ROI calculator for a whole initiative, or the AI automation ROI calculator for a single repetitive task, then size the model bill with the LLM cost calculator.
How accurate are the results?
The results are exactly as accurate as the numbers you enter. Each tool applies a fixed, published formula, so the arithmetic is right, but the expected cost reduction, automation rate or token counts are your estimates. Treat the output as a planning figure, then replace the assumptions with measured production data once the system is running.
Do the calculators include industry benchmarks?
No. The cost and ROI calculators work only from the numbers you enter, and the two scored tools use fixed bands written into the tool. The LLM cost calculator includes a per-million-token price table for each model it lists; check it against your provider’s current pricing page before you rely on the figure.
What is the difference between the AI ROI and AI automation ROI calculators?
The AI ROI calculator looks at a whole initiative: it starts from the annual cost of a process and an expected percentage reduction. The AI automation ROI calculator looks at one task: it starts from people, hours per week and hourly cost, then applies an automation rate. Use the second when you can count the hours.
Can I use these figures in a business case?
Yes, as long as you show the inputs alongside the result. Every tool page explains its formula and works through an example, so a reviewer can repeat the calculation. State where each input came from, such as a finance report, a time study or a provider price list, and note which numbers are still assumptions.
How does Perimattic AI Suite relate to these tools?
The calculators estimate; Perimattic AI Suite measures. AI Suite is an AI observability platform that traces each model call in production with its tokens, cost, latency and quality score on OpenTelemetry. Once a system is live, those traces replace the assumptions you entered here with real per-request cost and behaviour.
Turn the estimate into measured numbers
A calculator gives you a planning figure. Perimattic AI Suite traces every model call in production with its tokens, cost, latency and quality score, so you can check the estimate against what your AI systems actually do. Tell us what you are building and a Perimattic engineer will follow up.
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