The 1-3-5 method is a daily planning rule: every day, you plan to accomplish 1 big task, 3 medium tasks, and 5 small tasks. That's it. No sprawling to-do list. No vague "get everything done" intention. Just 9 things, organized by size, and a realistic expectation about what you can actually finish in a workday.

The method is simple but surprisingly hard to follow consistently. Most people, when they try it, discover their "big task" is actually three big tasks, their "medium" tasks are each hour-long projects, and their "small" tasks are things they could delegate or drop entirely. The constraint forces honesty about what a day can hold.

Key Takeaways

• The 1-3-5 method works because it forces prioritization before the day starts, not during it

• The big task is non-negotiable: if you get nothing else done, this is what you finish

• Pair the 1-3-5 method with a tool like Lifestack to assign specific time slots to each task and prevent the day from being swallowed by meetings

How the 1-3-5 Method Works

Each evening or first thing in the morning, you write down your plan for the day:

• 1 big task: something that takes 2 to 3 hours and moves the needle on something important. This is your anchor for the day

• 3 medium tasks: things that take 30 to 60 minutes each. Meaningful work, but smaller in scope

• 5 small tasks: things that take 15 minutes or less. Admin, quick follow-ups, short reviews

Add them up: roughly 1 day's worth of focused work. Not every day will go perfectly, and that's fine. The structure gives you something to come back to when the day drifts.

Picking Your Big Task

The big task is where the 1-3-5 method earns its value. Most people start their day reacting: checking email, attending stand-ups, handling whatever shows up first. The 1-3-5 method says: before any of that, commit to what the most important thing today is.

Your big task should pass one test: if you finish only this thing today, will you feel like the day was worth it? If yes, it's the right task. If not, you haven't found it yet. This is closely related to the eat the frog approach: identify the most important thing and protect time for it above everything else.

Do your big task first if at all possible. Willpower and focus degrade through the day. Protecting the morning for your biggest task is not a preference; it's a structural advantage.

Picking Medium and Small Tasks

Medium tasks are real work: writing a report, reviewing a document, having a 45-minute call, completing a section of a project. Each one should be specific enough to finish. "Work on the proposal" is not a medium task. "Draft the executive summary for the proposal" is.

Small tasks are genuinely small: send a confirmation email, fill out a form, review a one-page document, make a quick decision. If a "small task" starts pulling you into complexity, it's not actually small. Reclassify it and plan accordingly.

The goal isn't to fill all 9 slots perfectly. It's to be honest about what the day actually holds. If you have four hours of meetings, your big task needs to fit in whatever focused time remains.

How the 1-3-5 Method Compares to Other Systems

Compared to the Eisenhower matrix, the 1-3-5 method is simpler: you're not categorizing tasks by urgency and importance, just by size and count. It's faster to apply day-to-day.

Compared to a standard daily checklist, the 1-3-5 method adds structure by forcing a limit and a size classification. A daily checklist can have 20 items with no sense of relative priority. The 1-3-5 list has exactly 9 items with a clear hierarchy.

It's not as detailed as time blocking, which assigns specific hours to each task. The 1-3-5 method tells you what to do; time blocking tells you when. They pair naturally: use the 1-3-5 to decide your task list, then block time on your calendar for each one.

Best Tool for the 1-3-5 Method

Lifestack works particularly well with the 1-3-5 method because it goes one step beyond the list: it auto-schedules your tasks into your actual calendar based on priority and available time. Your big task gets a morning block. Medium tasks fill the rest of the day. Small tasks get slotted in around meetings.

This closes the gap between planning and doing. The 1-3-5 method gives you the plan. Lifestack turns the plan into a daily schedule you can actually follow. Pricing: $7/month, $50/year, or $120 lifetime, with a 7-day free trial on the annual plan.

FAQ

What is the 1-3-5 method?

A daily planning rule: plan to do 1 big task, 3 medium tasks, and 5 small tasks each day. The method works by constraining your task list to a realistic amount of work and organizing it by size, so you always know what's most important.

What counts as a "big task" in the 1-3-5 method?

Something that takes 2 to 3 hours of focused work and that matters enough that finishing it would make the day feel successful. If you'd describe it as a project deliverable, a major piece of writing, or a complex problem you've been putting off, it's probably a big task.

Can I use the 1-3-5 method every day?

Yes, and that's the goal. The best version of the 1-3-5 method is one you plan the night before, so Monday morning starts with a clear intention rather than 20 minutes of "what do I do first." The daily routine approach pairs well with this.

What if I have more than 9 things to do?

You almost certainly do. The 1-3-5 method doesn't say ignore everything else. It says commit to these 9 and treat everything else as overflow. Keep a separate task list for overflow; if you finish your 9, pull from it. Don't let the overflow list become the plan.

Does the 1-3-5 method work for people with ADHD?

Better than most systems, actually. The constrained list reduces decision fatigue at the start of the day. The size hierarchy makes it clear which task matters most without requiring complex prioritization. And the big task is a natural anchor for when attention drifts. See our guide on ADHD task paralysis for more context.