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Chore Rotation Calculator

Enter your chores, the people sharing them, and a week number.

How it is calculated

Both lists are split on commas and trimmed; empty entries are ignored. The chore in position i (counting from 0) goes to the person in position (i + w) mod P, where w is the week number (a decimal is cut to a whole number, a blank means 1) and P is the number of people. Each week the whole assignment slides by one person, so the pattern repeats every P weeks.

Week 0 gives the first chore to the first person. Negative weeks also work and rotate backwards. The tool prints one line per chore as “chore — person”, plus the counts of chores and people. If there are more chores than people, some people get more than one chore, and the same person can appear twice in a week; if there are more people than chores, some people get nothing that week.

Worked example

There are 4 chores (Dishes, Trash, Vacuum, Bathroom) and P = 3 people (Ayşe, Mehmet, Can), and we want week 2. Dishes is position 0: (0 + 2) mod 3 = 2, which is Can. Trash is position 1: (1 + 2) mod 3 = 0, which is Ayşe. Vacuum is position 2: (2 + 2) mod 3 = 1, which is Mehmet. Bathroom is position 3: (3 + 2) mod 3 = 2, which is Can again. So the schedule is Dishes — Can, Trash — Ayşe, Vacuum — Mehmet, Bathroom — Can.

Try this example →

Common mistakes

  • Separating names with semicolons or line breaks. Only commas split the lists, so “A; B” is treated as one single person called “A; B”.
  • Listing more chores than people and expecting an even split. With 4 chores and 3 people one person always gets two chores per week, because the first and fourth chore share a position in the cycle.
  • Expecting the schedule to repeat after the number of chores. It repeats after the number of people, so week 4 equals week 1 with 3 people.
  • Starting the count at week 1 and being surprised that week 0 looks different. Week 0 gives the first chore to the first person, and every week after shifts it by one.
  • Typing a person's name twice by accident. That person is then counted as two people and gets more turns than the others.

About this calculator

A fair chore schedule rotates every task through every person over time rather than assigning the same job permanently to one member of a household — this calculator generates that rotation using modular arithmetic, shifting the chore-to-person assignment by one position each week so that, given enough weeks, everyone cycles through every chore an equal number of times.

The method is popular with families, shared houses, and college roommates setting up a recurring cleaning or task schedule, since it removes the need to manually reassign duties and avoids the perception that any one person is stuck with the least pleasant job. Entering a week number instantly shows who's assigned to what, making it easy to print a schedule months in advance or settle a dispute over whose turn it is.

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