FTB-C000478 / Indicator

Bollinger Bands

Bollinger Bands are a moving center with upper and lower bands placed at a declared multiple of rolling price dispersion.

Also known asBBBollinger Bands indicator

Intermediate 2 linked topicsPublished

Definitions

In plain terms

The traditional form uses a 20-period simple moving average of close with bands two standard deviations above and below it.

Technical

A reproducible contract freezes price source, lookback, center type, population or sample deviation, multiplier, current-row inclusion, readiness, and display offset.

Scope

The defaults are configurable and band contact is not an automatic buy or sell signal.

Examples

  • A reviewer traces Bollinger Bands from aligned inputs through its first-ready row and edge cases before accepting a displayed value.

Common misconceptions

  • The defaults are configurable and band contact is not an automatic buy or sell signal.

Concept relationships

Prerequisites

Related

Required by

Where this concept is used

Tutorials planned

These catalogued topics use this concept, but their complete build has not shipped yet.

  • D07-F04-A03 Primary
  • D07-F04-A06 Prerequisite

Evidence and governance

  1. Bollinger Bands Rules John Bollinger · first party methodology

    Supports: preferred label, short definition, technical definition

    Limits: Interpretive rules do not prove forecasting power, trade profitability, or one universal parameter selection.

  2. Bollinger Bands TradingView · official platform documentation

    Supports: preferred label, short definition, technical definition

    Limits: Platform behavior and interpretation are not universal standards and do not replace the local frozen variant.

  3. TA-Lib Bollinger Bands TA-Lib · first party technical publication

    Supports: preferred label, short definition, technical definition

    Limits: TA-Lib permits moving-average variants beyond the local close-SMA and population-deviation contract.

Reviewed by
fintech-builder-batch-009
Last reviewed
2026-07-30
Next review
2027-07-30
Record status
published
Written by

Fintech engineer building market-data and financial systems, and the author of every article, glossary record, and reference implementation on The Fintech Builder.