Adding weeks keeps the weekday fixed, which is the whole appeal of counting in sevens: six weeks from a Tuesday is a Tuesday, and there is nothing to check. This calculator turns a number of weeks into a date, and it is the natural tool for anything that recurs — a fortnightly rota, a six-week course, a twelve-week training block, a 40-week pregnancy count, a rolling notice period expressed in weeks.
British administration uses weeks more than most calendars do. Rent is often set weekly, statutory pay periods and school terms are counted in weeks, and a great deal of NHS scheduling is described in weeks from a referral. The result here is shown alongside the equivalent number of days so the two can be reconciled with a contract that mixes the units.
Two things to keep in mind. The weekday stays constant but the date of the month drifts, so a four-weekly cycle produces thirteen occurrences a year rather than twelve, and a payment schedule built on it will not line up with month-end. And the result can land on a bank holiday, which for anything scheduled — a class, a delivery, a clinic — usually means it moves. The weekday and any bank holiday clash are both shown with the answer.
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