Floating point can’t hold a cent. BigDecimal can, until commonMain.

📰 Medium · Programming

Learn how to store money in Kotlin Multiplatform using three different methods and understand the limitations of each approach, especially with BigDecimal in commonMain

intermediate Published 13 Jun 2026
Action Steps
  1. Choose a data type to store money, such as Float or Double
  2. Use BigDecimal for precise calculations, considering its limitations in commonMain
  3. Implement a custom solution using integers to represent monetary values
  4. Test and validate the chosen approach for accuracy and reliability
  5. Consider the trade-offs between precision, performance, and complexity when selecting a method
Who Needs to Know This

Software engineers and developers working on financial applications in Kotlin Multiplatform will benefit from understanding the best practices for storing monetary values, and team leads should be aware of the potential pitfalls of using BigDecimal in commonMain

Key Insight

💡 BigDecimal is not a reliable choice for storing money in commonMain due to its limitations, and a custom solution using integers may be necessary for precise calculations

Share This
💡 Did you know that floating point can't accurately store a cent? Learn how to store money in Kotlin Multiplatform using BigDecimal and other methods

Key Takeaways

Learn how to store money in Kotlin Multiplatform using three different methods and understand the limitations of each approach, especially with BigDecimal in commonMain

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