---
title: "Percentage-Based Stock Alerts: The Complete Guide"
description: "What a percentage-based stock alert is, why it needs a baseline, and how to combine conditions into one reliable watcher."
source: "https://onepage.live/concepts/percentage-based-stock-alerts/"
---
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## What a percentage-based alert is

A percentage-based alert notifies you when a stock or ETF moves by a set **percentage**, instead of crossing a fixed price. Onepage.live calls one of these rules a **watcher**: pick a ticker, a threshold, and a baseline, and it watches quietly until the condition is met.

## Why it needs a baseline

“Up 5%” or “down 8%” only means something relative to a starting point — the **baseline**. The same percentage move reads completely differently depending on what it’s measured against:

Baseline

What it catches

Opening price

Today’s intraday move

Previous close

Overnight gaps and reactions

7-day average

Short-term trend shifts, filters daily noise

30-day average

A calmer monthly baseline

90-day average

Quarterly context, less noise

52-week high/low

Distance from a recent peak or bounce off a bottom

Your own price

Any number you choose to anchor to

Picking the right baseline is what separates a useful alert from noise or a missed move.

## Layering conditions

A single threshold-plus-baseline is often not enough — it either fires on ordinary wobble or misses the real signal. Onepage.live lets you combine up to 5 logics into one watcher, for example: _up 5% vs the month_ **and** _above the opening price_. You only hear from it when every condition agrees.

## Where to go next

This page covers the concept end-to-end. For specific setups:

*   [Alert when a stock drops 5%](/guides/alert-when-stock-drops-5-percent) — a concrete walkthrough for a drop alert
*   [Stock percentage alerts vs fixed-price alerts](/guides/stock-percentage-alerts) — why percentage wins when you’re choosing a tool
*   [ETF price change alerts](/guides/etf-price-change-alerts) — why ETFs need slower baselines than single stocks

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