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I’m adding multiple percentage fields in a form that should total 100% but it’s not working

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1 Answers

Answer by Anonymous ✅ (Accepted)

This is due to a rounding issue with floating point numbers in Javascript.

FBA stores percentages as a decimal, so 50% = 0.5

In Javascript, adding 0.7 + 0.2 + 0.1 = 0.999999999 instead of 1

As such you need to round as follows…

Math.round(<<TotalPercent>> * 100) / 100

This assumes you’re dealing with percentages to 0dp e.g. 50%

If you’re dealing with higher precision e.g. 1dp or 50.5% then you need to implement as follows…

Math.round(<<TotalPercent>> * 1000) / 1000

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