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What is sitemap.xml/undefined as a percentage?

NaN% is the percentage you get when you try to turn the fraction sitemap.xml / undefined into a percent.

Since the denominator “undefined” has no numeric value, the whole expression cannot be calculated. That’s why the result shows up as “NaN”, which stands for “Not a Number”. It tells you that the math doesn’t make sense in the usual way.

In everyday work, you’ll rarely see a real fraction like this. If a tool or script tries to divide by something that isn’t defined, it will often return NaN% as a placeholder to warn you that something went wrong.

So whenever you spot NaN%, think of it as a signal to check the numbers you’re using, because the calculation can’t be completed as written.

Fraction Percentage is your source for tools to calculate fractions to percentages.
Convert Sitemap XML Values to Percentages – Free Online Tool