# Percent Change (PCTCHANGE)

> QuantNexus indicator page for rolling percentage change.

**Route**: `/quantnexus/indicators/pctchange/`

## What It Does

PCTCHANGE measures the percentage change in price over the selected lookback period.

## Formula

`PctChange = ((Price(t) - Price(t - period)) / Price(t - period)) * 100`

## Parameters

- `period` - default `30`

## C++23 API

```cpp
#include <nonabt/indicators/pctchange.hpp>
auto pctChange = std::make_unique<nonabt::PCTCHANGE>(data().close(), 30);
```

## Common Usage

- Use it to compare momentum in percentage terms.
- Helpful for normalizing moves across assets with different price scales.
- Pair it with trend or volatility filters for cleaner interpretation.