FTB-C000486 / Formula component

Bollinger Full Band Width

Bollinger Full Band Width is the price-unit distance between the upper and lower Bollinger bands.

Also known asabsolute Bollinger widthBB width

Foundation Formula defined 2 linked topicsPublished

Definitions

In plain terms

For symmetric bands it equals twice the multiplier times rolling standard deviation.

Technical

The absolute width is U_t minus L_t and is ready when both bands are ready; it may legitimately equal zero.

Scope

Unlike BandWidth, this raw distance is not divided by the middle band and changes with quote scale.

Formula

Full band width = upper - lower = 2 * k * standard deviation
LaTeX: W_t=U_t-L_t=2k\sigma_t
SymbolMeaningUnit
U_tupper bandprice units
L_tlower bandprice units
kdeviation multiplierratio
sigma_trolling standard deviationprice units

Output unit: price units

Examples

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

Common misconceptions

  • Unlike BandWidth, this raw distance is not divided by the middle band and changes with quote scale.

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 Important
  • D07-F04-A06 Prerequisite

Evidence and governance

  1. Bollinger Bands Rules John Bollinger · first party methodology

    Supports: preferred label, short definition, technical definition, formula

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

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

    Supports: preferred label, short definition, technical definition, formula

    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.