A **conversion factor** *changes* something to a different version or form. A factor is something that brings results or a cause, while conversion is an action of changing the "version" of a thing.

In mathematics, specifically algebra, a *conversion factor* is used to convert a measured quantity to a different *unit of measure* without changing the relative amount. To accomplish this, a ratio (fraction) is established that *equals* one (1). In the ratio, the conversion factor is a multiplier that, when applied to the larger unit, converts the larger unit into the smaller unit, by multiplication with the measured amount.

- 24 hrs/1 day = 1 or 43,560 square feet/1 acre = 1
- 3 days = 3 × 24 hours = 72 hours (conversion factor is 24)

- Note: If a=b, then a/b=1 and b/a=1

Days are converted, to hours, by multiplying the days by the conversion factor as 24. The conversion can be reversed by dividing, the hours, by 24 to get days; however, the reciprocal 1/24 could be considered the reverse conversion factor for an hours-to-days conversion, where 1/24 ~= 0.0416666666667. Hence, the term *"conversion factor"* is the multiplier which yields the result, not a divisor from that viewpoint. To yield hours, the conversion factor is 24, not 1/24, so: hours = days × 24 (multiplying by the factor).

Read more about Conversion Factor: Common Conversion Factors For Water and Wastewater

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