The 1-3-5 Rule: A Simple Daily To-Do List Method

By Camellia · Updated Oct 12, 2026

The 1-3-5 rule is a daily planning method that limits your to-do list to nine tasks: one big task, three medium tasks and five small ones. The cap forces you to choose what matters before the day starts, instead of carrying a list so long that nothing on it feels finishable. It works best as a daily layer on top of a larger master list, not as a replacement for one.

Key Facts

• The rule says to accept that you can reasonably get one big thing, three medium things and five small things done in a day, and to keep your daily to-do list to just those nine items.
• Todoist's guide attributes the method to Alexandra Cavoulacos, co-founder of The Muse, and says it appeared in a Muse blog post and in the book The New Rules of Work, written with Kathryn Minshew.
• That same guide suggests rough sizes: a big task takes about 2 to 4 hours, a medium task 30 to 60 minutes, and a small task 5 to 15 minutes.
• The Muse says the numbers can flex. Someone in meetings most of the day might cut the list down, and someone with lots of surprises might leave slots blank.
• The Ivy Lee method, the older cousin of this rule, caps the day at six ranked tasks.

What the 1-3-5 Rule Is

Most to-do lists fail for a boring reason: they hold everything. A list with 40 items doesn't tell you what to do first, and it quietly turns every unfinished day into a small failure.

The 1-3-5 rule fixes the problem with a hard limit and a mix. You don't just cap the list at nine. You decide the size of each slot:

The time ranges come from Todoist's guide, and they're a guide, not a law. What matters is the proportion: one task that deserves your best energy, a few solid ones, and a handful of small ones that clear your head.

The Muse's own argument is simple. You only have so much time, and you can only get a finite number of things done in a day, so prioritization is the thing that works. The rule just makes the limit concrete.

Where the Method Comes From

The method is commonly credited to Alexandra Cavoulacos, who co-founded the careers site The Muse. According to Todoist's overview, it first appeared in a Muse blog post and was later described in The New Rules of Work, which she wrote with Kathryn Minshew. The original Muse article carries a byline of "The Muse Editors," so if you're citing it, attribute it to The Muse and say the credit to Cavoulacos comes from secondary sources.

None of this is evidence the method works. Treat the rule as a practical habit you can test for two weeks, not a proven productivity breakthrough.

How to Use the 1-3-5 Rule: Step by Step

You can run the whole thing with paper, a notes app or a task manager.

1. Keep a master list. Dump every task, request and idea into one place. This is where things live until they're chosen. The 1-3-5 list is never the master list. It's today's slice of it.
2. Size your tasks. Label each item big, medium or small. If a "big" task is really a project ("launch the new website"), break it down until one piece fits in a half-day. Overscoping is the most common way the method breaks, according to Todoist's guide.
3. Pick the big one first. Ask: if I only finish one thing today, which would I be glad I did? That's your big task. Choose it before the others, since it decides how much room is left.
4. Pick three mediums. Choose work that supports your goals this week, or that someone is waiting on. Resist filling medium slots with things that are merely noisy.
5. Pick five smalls. These are the replies, approvals, calls and tidy-ups. They're allowed to be dull. They're also what stops small stuff from piling up and eating your afternoon.
6. Plan the day the evening before, or first thing in the morning. Todoist's guide suggests planning the night before. Either works, as long as you pick the nine before you open your inbox.
7. Do the big task early. Todoist's guide recommends finishing it before lunch. Your energy and focus are usually better, and nobody has asked you for anything yet.
8. Review and reset. At the end of the day, check off what's done. Decide for each leftover item whether to reschedule it, move it back to the master list, or delete it.

Notice that the rule doesn't ask you to finish everything. It asks you to decide, in advance, what a good day looks like.

Ready-to-Copy Template

Copy this table into your notes app, a doc or a spreadsheet and fill it in daily.

And a short end-of-day check:

A filled-in example for a marketing manager:

1-3-5 Rule vs Other Task Methods

The 1-3-5 rule overlaps with several better-known approaches. They solve different problems, so it helps to know which one you need.

On the Ivy Lee method, James Clear's write-up says to list up to six tasks at the end of the workday, rank them by importance, and work them in order. The 1-3-5 rule keeps the same spirit (a short list, set in advance) but swaps ranking for sizing. If you tend to drown in small tasks, the Ivy Lee order may suit you better. If you tend to avoid small tasks until they become emergencies, the five small slots will help.

The Eisenhower method answers a different question. The Eisenhower Matrix sorts work into four groups: do first, schedule, delegate, and don't do. You can use it upstream of 1-3-5: sort the master list with the matrix, then pull today's nine from the "do first" and "schedule" groups. Our guide to the Eisenhower matrix walks through that sorting step.

Time blocking is a natural pairing too. Once you've picked your nine, put the big task in your best two- to four-hour window and cluster the small ones into a single block so they don't scatter your day.

Examples by Business Function

The rule is a shape, not a script. Here's how the same nine-slot structure could look across different roles. These are illustrations, not prescriptions.

Two things stand out. First, the big task is rarely the loudest one. It's usually the one that's easy to postpone because nobody is chasing you for it. Second, small tasks fit more easily into gaps between meetings, so they belong in the slack time, not your prime hours.

Do's and Don'ts

On that last point, the Muse article itself says to adjust. It suggests that if your day is mostly meetings, you might cut your number of items down, and if your job brings many unplanned requests, you might leave some slots blank to fill as things come up.

Common Mistakes

Mislabeling sizes. If every task is "big," the rule collapses into a long list. Be honest about how much time something needs. A quick check: if you can't picture finishing it in one sitting, it's a project, not a task.

Using it with no master list. The rule picks from a pool. Without that pool, you'll keep re-deciding what exists, and good ideas will get lost.

Doing the small stuff first. It feels productive to clear five quick items before lunch. But then the big task slides to 4 p.m., when you're tired. Small tasks are often a form of procrastination that looks like progress. Our guide on why personal productivity fails covers that pattern, and the productivity traps lists related ones.

Ignoring how long tasks really take. Work tends to expand to fill the time you give it, which is the idea behind Parkinson's law. Estimates help, but so does setting a time limit on the big task so it doesn't swallow the whole day.

Skipping the review. Without a daily reset, leftovers silently roll over until the list is bloated again.

Treating the rule as a goal system. The 1-3-5 rule decides what you do today. It doesn't decide what matters this quarter. For that, pair it with tiered goals and metrics and a habit of disciplined execution, so your big task is always tied to something that counts.

When the Rule Works and When It Doesn't

It tends to work well for knowledge workers with a mix of deep work and admin: managers, marketers, analysts, account owners, founders. It gives you a clear stopping point and a daily win.

It fits less well in jobs where the day is dictated by incoming demand, like some support or emergency roles. There, a fixed list gets overwritten by the queue. In that case, treat the rule as a loose guide for the portion of the day you control, and leave slots blank, as The Muse suggests.