Free tools to estimate and cut your LLM costs
Count tokens, estimate a monthly bill per model, check provider prices and work out what caching and routing could save. Free to use, figures in US dollars.
Last updated October 22, 2026
What free tools help you estimate and reduce LLM costs?
Perimattic offers a gateway savings calculator for caching and routing, a token calculator, an LLM cost calculator, an LLM observability cost calculator and per-provider API pricing guides. All are free and work with your own numbers (the savings calculator shows its result after a one-time free sign-up), so you can size a bill, compare models and test savings before changing anything.
Which LLM cost tool should you use?
| Tool | What it answers | Type |
|---|---|---|
| LLM gateway savings calculator | How much could caching and routing to cheaper models take off my monthly LLM bill? | Calculator |
| Token calculator | How many tokens is this prompt, and what does it cost on each model? | Calculator |
| LLM cost calculator | What will a model cost me each month at my request volume and prompt sizes? | Calculator |
| LLM observability cost calculator | What will tracing and monitoring my LLM calls cost? | Calculator |
| LLM API pricing guides | What does each provider charge per 1M input and output tokens? | Guide |
The savings calculator works from your total bill, so it needs no model prices. The other calculators and the pricing guides help when you need a per-model figure, such as the price gap between your current model and a cheaper one.
Which tool fits the question you have?
| If you want to… | Start with | Then |
|---|---|---|
| Estimate a bill before you build | Token calculator | LLM cost calculator |
| Cut a bill you already pay | Savings calculator | Pricing guides |
| Choose between two models | Pricing guides | LLM cost calculator |
| Budget for monitoring | Observability cost calculator | Perimattic AI Suite |
Every calculator uses the numbers you enter. Model prices change often, so check them against the provider's own page before you rely on a figure.
Where does Perimattic LLM Gateway fit in?
Perimattic LLM Gateway sits between your application and model providers. It offers one OpenAI-compatible API in front of multiple providers, routing rules with automatic fallback, exact-match and semantic caching, budgets and rate limits per team, API key or customer, and cost tracking by team, feature and customer with alerts. It runs in your own cloud (VPC) or managed.
Get started: Sign up and our team will get in touch, or read the LLM Gateway overview.
Guides that go with the tools
Questions about the free tools
Do I need to sign up to use these tools?
Only to see the savings calculator’s result. You can fill in the savings calculator freely, and a one-time free sign-up shows your result; after that it stays unlocked in your browser. The pricing guides are open to everyone. The calculators run in your browser and do not send or store what you enter; only the sign-up form is sent.
Which tool should I start with?
If you do not know your bill yet, start with the token calculator or the LLM cost calculator to estimate it per model. If you already know your monthly spend, go straight to the gateway savings calculator to see what caching and routing could take off it.
How do I get started with Perimattic LLM Gateway?
The tools on this page work on their own and do not need the gateway. To try Perimattic LLM Gateway itself, sign up on the LLM Gateway page and tell us which models and providers you use. Our team will contact you to understand your needs and set you up.
Want one API for every model, with costs under control?
Sign up to tell us which models and providers you use, and our team will get in touch to set up the LLM Gateway for your stack.
Sign up