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Troubleshooting precision errors in large number calculations using Adaptive Forms in Adobe Experience Manager 6.5

Last update: Mon Sep 22 2025 00:00:00 GMT+0000 (Coordinated Universal Time)

If Adaptive Forms in AEM 6.5 are not producing accurate results for large number calculations with four-decimal precision, consider using open-source JavaScript libraries like decimal.js or bignumber.js. These libraries help ensure compliance and accuracy in critical use cases such as financial forms.

Description description

Environment

  • Product: Adobe Experience Manager (AEM) Forms
  • Version: AEM 6.5 (On-premises) (Foundation + core components)

Issue/Symptoms

Adaptive Forms do not accurately calculate large numbers (typically 7–10 digits) with four-decimal precision. This can affect financial or compliance forms, where exact values are required without rounding errors. This behavior is caused by a floating-point precision loss in the current product implementation.

Examples:

  • Multiplication:

    Expected: 7384921.1234 × 84275931.56 = 622,347,918,234,567.7890

    Actual: 622347918234567.78

  • Subtraction:

    Expected: $193,847,562,983,745.4321 - $6,789.1234 = $193,847,562,976,956.3087

    Actual: $193,847,562,976,956.3100

The default Adaptive Forms functionality does not support this level of precision.

Resolution resolution

To resolve this issue:

  1. Use open-source JavaScript libraries such as decimal.js or bignumber.js for high-precision arithmetic. For more information, refer to decimal.js GitHub Repository and bignumber.js GitHub Repository.

  2. Include the library in your project. Create a custom function using the library to perform calculations with four-decimal accuracy.

    • Note: Adobe does not provide or support these third-party libraries out-of-the-box, and is not responsible for their implementation or performance. When including any third-party library, even well-known ones, always validate for security risks, client footprint impact, and ensure thorough testing in all relevant environments.

For advanced customization or integration, consult a developer with experience in high-precision arithmetic and AEM Forms.

Introduction to Custom Functions for Adaptive Forms based on Core Components in AEM Sites WKND Tutorials.

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