---
title: "What is the underlying formula used to calculate the default range in Renko charts for a script, given that it doesn't align with the conventional ATR14 method?"
description: "What is the underlying formula used to calculate the default range in Renko charts for a script, given that it doesn't align with the conventional ATR14 me"
category: arrow
subcategory: general
slug: what-is-the-underlying-formula-used-to-calculate-the-default-range-in-renko-char
canonical: https://support.arrow.trade/arrow/general/what-is-the-underlying-formula-used-to-calculate-the-default-range-in-renko-char/
---

# What is the underlying formula used to calculate the default range in Renko charts for a script, given that it doesn't align with the conventional ATR14 method?

> What is the underlying formula used to calculate the default range in Renko charts for a script, given that it doesn't align with the conventional ATR14 me

## Short answer

The default brick size uses the Caveman algorithm , not the conventional ATR14 method. This algorithm analyses 300 aggregated bars of data on your chart (approximately one year for daily charts and 5 hours for minute charts) and determines the default value.

The default range varies depending on the instrument you view.

## Related

- Browse more in [general](/arrow/general/)
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- Support: [support@arrow.trade](mailto:support@arrow.trade)

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Source: https://support.arrow.trade/arrow/general/what-is-the-underlying-formula-used-to-calculate-the-default-range-in-renko-char/
Publisher: Arrow / iRage Broking Services LLP