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

# Estimate Tokens Heuristic • Rust AI Agent SDK

> estimate_tokens_heuristic: Estimate tokens for a string using heuristic (4 chars ≈ 1 token).

# estimate\_tokens\_heuristic

<div className="flex items-center gap-2">
  <Badge color="teal">Function</Badge>
</div>

> This function is defined in the [**context**](../modules/context) module.

Estimate tokens for a string using heuristic (4 chars ≈ 1 token).

## Signature

```python theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
def estimate_tokens_heuristic(text: &str) -> usize
```

## Parameters

<ParamField query="text" type="&str" required={true}>
  No description available.
</ParamField>

### Returns

<ResponseField name="Returns" type="usize">
  The result of the operation.
</ResponseField>

## Uses

* `average`

## Source

<Card title="View on GitHub" icon="github" href="https://github.com/MervinPraison/PraisonAI/blob/main/src/praisonai-rust/praisonai/src/context/mod.rs#L319">
  `praisonai/src/context/mod.rs` at line 319
</Card>

***

## Related Documentation

<CardGroup cols={2}>
  <Card title="Rust Token Management" icon="coins" href="/docs/rust/token-management" />

  <Card title="Rust Budget" icon="wallet" href="/docs/rust/budget" />
</CardGroup>