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It doesn't matter which you use as the numerator or denominator in a unit conversion calculation as long as you get your units straight. For example, if you use 1 inch is 2.54 centimeters:

You can write is as:

1 inch / 2.54 centimeters = x inches / y centimeters

and do either of the following:

  • You can plug in your known value for x and solve for Y
  • You can plug in your known value for Y and solve for X

You can also write it as:

2.54 centimeters / 1 inch = Y centimeters / X inches

and do either of the following:

  • You can plug in your known value for x and solve for Y
  • You can plug in your known value for Y and solve for X

This would work for any unit conversion as long as you know the conversion rule.

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8y ago
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Wiki User

8y ago

Well, numerators and denominators are not involved in unit conversion.

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Q: When converting units into another unit how do you know which one to use as the denominator?
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Related questions

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It is the units for the measurement which you are converting FROM.


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You place the unit which you are converting from in the denominator.


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These are the units which are used for the measurement that you are converting FROM.


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