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Regularity Calculator
Many events or appointments regularly occur multiple times within a given period. Here, you can extrapolate how often these occur on average within a different, arbitrary time span. Please enter exactly one value in the left column and, if desired, a custom time span. The other values for the specified time spans and the custom time span will be calculated.
* One year is considered to be an average year with a length of 365.25636 days. If you want to have a normal year as the time span, you can specify 365 days for the custom time span.
For example, if you travel to and from work five times a week, you'll do this 260 times in one year and 782 times in three years. Of course, you have to round down here; this is the case with many appointments where there are no fractions. Vacations and days off are not included in this calculation; these must be subtracted to determine the true value.
As in the example above with the commutes, complete regularity is rarely present. There are always appointments that are canceled or don't take place for various reasons. Here, you should make a sensible estimate of what value to subtract from the extrapolated value. For commutes, 40 to 50 per year can be a good value for vacation days, holidays, and sick days, by which the calculated value is reduced. This would result in 210 to 220 of such travels per year, and 632 to 662 in three years. Making this calculation for shorter periods is not particularly useful.
Another example for using this calculator would be a machine that produces a certain number of units over a certain time. In such a case, significantly fewer missed dates may occur, but they will still occur sooner or later.
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Last updated on 07/01/2025. Author: Jürgen Kummer