How do you convert K to R?

Multiply Kelvin by nine fifths to get Rankine.

Think of Kelvin as a temperature scale that starts at absolute zero and uses the same step size as Celsius, while Rankine also starts at absolute zero but uses the same step size as Fahrenheit. To convert from Kelvin to Rankine you multiply the temperature in Kelvin by nine fifths because each Kelvin degree equals nine fifths of a Rankine degree. That nine fifths factor comes from the ratio between the size of a Fahrenheit degree and a Celsius or Kelvin degree. So take the Kelvin value, multiply it by nine, then divide by five, and the result is the temperature in Rankine.

A common mistake is forgetting that Rankine uses Fahrenheit-sized steps so people sometimes try to add or subtract thirty two like they do between Celsius and Fahrenheit, which is wrong because both Kelvin and Rankine share the same zero point at absolute zero, so do not add or subtract thirty two; only multiply by nine fifths. Another slip is using the wrong fraction like five ninths instead of nine fifths, which gives the inverse result, so check the order of numerator and denominator before calculating. Also watch out for arithmetic errors when multiplying large numbers by nine and then dividing by five, and if you are unsure use a calculator and write the fraction clearly.

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Convert Kelvin to Rankine: Multiply by 9/5

1. Kelvin starts at absolute zero
2. Rankine uses Fahrenheit-sized steps
3. Multiply K by 9/5
4. Nine fifths equals Fahrenheit/Celsius ratio
5. Multiply by 9 then divide by 5

Common Kelvin to Rankine Conversion Errors

1. Adding or subtracting 32
2. Using five ninths instead of nine fifths
3. Arithmetic errors with nine and five

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