1-3-5 Rule
Also known as: 1-3-5 to-do list, 1-3-5 method
The 1-3-5 Rule is a daily planning method where you limit your to-do list to one big task, three medium tasks and five small ones. It fights procrastination by forcing you to choose in advance what matters, so an overwhelming backlog becomes a nine-item day you can realistically complete.
| Origin | Popularised by career site The Muse in the early 2010s; the idea of capping the daily list is much older |
|---|---|
| Time required | 5 minutes of planning per day |
| Best for | overwhelm, long to-do lists, prioritisation, daily planning |
| Difficulty | Very easy |
How to use 1-3-5 rule
- At the end of the day, or first thing, look at your full task list.
- Pick one big task: the thing that would make tomorrow a success on its own.
- Pick three medium tasks: real work, but under an hour each.
- Pick five small tasks: emails, calls, errands, each under 15 minutes.
- Write these nine on a fresh page and ignore the master list until tomorrow.
- If new work arrives, it either replaces an item of the same size or waits for the next day.
There is no direct research on the 1-3-5 Rule; it is a productivity heuristic, not a studied intervention. Its plausible mechanisms have support in adjacent work: choosing tasks in advance functions like an implementation intention, and a short, closed list avoids the choice overload and demotivation that very long lists produce. Treat the exact numbers as arbitrary but useful.
Gollwitzer, P. M., & Sheeran, P. (2006). Implementation intentions and goal achievement: A meta-analysis of effects and processes. Advances in Experimental Social Psychology, 38, 69–119. https://doi.org/10.1016/S0065-2601(06)38002-1
Common mistakes
- Smuggling a second big task into the medium column. The cap is the technique; break it and you are back to a wish list.
- Filling all nine slots on a day full of meetings. Scale down to 1-2-3 when your available hours are short.
- Choosing the big task by urgency alone. Ask what you are most likely to avoid, and put that first.
Related techniques
Ivy Lee MethodEat The FrogTime Blocking
Frequently asked questions
What is the 1-3-5 Rule for to-do lists?
You plan each day around exactly nine tasks: one big, three medium, five small. Everything else stays on a separate master list. The point is a daily list short enough to finish.
Is the 1-3-5 Rule backed by research?
No. It comes from career-advice writing, not from studies. But its core moves, deciding tasks in advance and capping the list, line up with well-supported findings on planning and follow-through.
What if I don't finish all nine tasks?
Carry unfinished items to tomorrow's nine, but notice the pattern. If your big task never gets done, it is probably too big for one day and needs splitting.