> ## Documentation Index
> Fetch the complete documentation index at: https://docs.truemath.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Input formats

> Enter Playground calculations as natural language or as structured text.

The Playground accepts two input formats: **natural language** prose and **structured text** `key: value` lines. Use natural language to explore, and structured text when you know the exact [variables](/concepts/variables) and target you want. (The [API](/api/calculate) adds a third, JSON, for programmatic use.)

For the full grammar of each format — values, units, tables, scenario selectors, and how omitted lines are inferred — see [Input formats](/concepts/input-formats).