TL;DR: Start with three to five meaningful tasks a day, plus small fixed jobs grouped into one item. Count how many you actually finish for a week, then plan to that number. Leave room for interruptions, make tasks small enough to finish, and keep the rest of your list out of sight.
There's a particular feeling at six o'clock when today's to-do list still has eleven items on it. You worked hard all day. You're tired. And the list says you failed.
Usually the list is the problem, not you. Most people plan far more than a day can hold, then feel bad about the gap every evening. Getting the number right is one of the simplest changes you can make, and it changes how the whole day feels.
Why we overplan
Two things push us towards long lists.
We underestimate how long tasks take. This is so common it has a name, the planning fallacy, first described by Daniel Kahneman and Amos Tversky. We imagine the task going smoothly and forget the interruptions, the false starts and the bit we didn't know about. Studies since have found it holds even when people have done the same task before.
We forget about everything that isn't on the list. Meetings, messages, lunch, the colleague who needs five minutes, the email that turns into an hour. A typical knowledge worker has far less uninterrupted time in a day than the hours on their contract suggest.
Put those together and a plan that looks reasonable at 9am is fiction by 11.
A good starting number
For most people, three to five meaningful tasks is a good starting point. "Meaningful" here means a task that moves something forward and takes real attention: drafting a section, designing a page, preparing a presentation, fixing a bug.
On top of that, you'll have small fixed jobs: pay an invoice, book an appointment, reply to a few emails. Group these into one line ("admin: invoices, dentist, emails to Jo and Sam") so they don't crowd the list.
Some well-known methods land in the same range:
- The Ivy Lee method uses six, ranked.
- The 1-3-5 rule suggests one big task, three medium and five small.
- Eat the Frog focuses on just one, done first.
They all agree on the principle: a short list, chosen on purpose.
Find your real number
Rather than trust a rule, measure. For one week:
- Plan your day as normal.
- At the end of the day, count how many meaningful tasks you finished.
- Write the number down.
After five days, take the average. That's your real daily capacity right now. Plan to that number, or one less, for the next fortnight.
Most people find the number is lower than they expected, often by half. That's not a sign you're slow. It's a sign your days have more interruptions than your plans allow for.
Make tasks finishable
The other half of the problem is task size. If one item on your list is "write the report", you can work on it all day and still not tick it off. The list feels as long at 6pm as it did at 9am.
Break big work into steps you can finish in one sitting: "draft the summary", "pull Q2 numbers", "write the recommendations section". Now the same day's work produces three ticks instead of zero, and you can see your progress. My guide to breaking down a big project shows how.
Leave slack
A day with no slack breaks at the first surprise. Plan roughly 60 to 70% of your available time and let the rest absorb whatever comes up. If nothing does, you finish early and choose another task, which feels much better than the reverse.
Keep the rest out of sight
A short daily list only helps if you look at it instead of the full list. Your full list might have a hundred items across every project. Looking at it while you work keeps reminding you how much isn't getting done.
Keep two things separate:
- The full list: everything, organised by project.
- Today's list: the three to five you chose.
During the day, only look at today's list. In Tatask that's the Today list: star the tasks you've chosen and they appear on their own, wherever they live in your projects. On the web, the count beside the star tells you how many are left.
What about urgent tasks that appear mid-day?
Write them down. Then ask whether it really has to happen today. Most "urgent" things can wait until tomorrow's plan. If it can't, swap it in and drop something else, so the list stays the same length. Adding without removing is how a plan for five becomes a list of nine.
A worked example
Priya is a product designer. Her usual daily list has nine items, and she finishes four or five. Every evening she moves the rest to tomorrow and feels behind.
For one week she counts what she actually finishes: 4, 5, 3, 5, 4. Her average is a little over four, so she plans four meaningful tasks a day for the next fortnight, plus one admin line.
She also notices that two of her usual items are too big. "Redesign onboarding" appears on her list most days and never gets ticked off. She breaks it into "sketch three options for the welcome screen", "review options with Tom" and "build the chosen option in Figma". Now it produces a tick most days, and she can see it moving.
By the end of the fortnight she finishes her four most days, and on good days adds a fifth. She ends the day with fewer unfinished items than before, despite planning less, because the list now matches the day she actually has. Her output hasn't dropped either: the tasks she drops from the plan were mostly the ones that used to roll over anyway.
The lesson isn't that four is the magic number. It's that her number, measured honestly, was lower than her ambition, and planning to it made the days calmer.
Signs you've got the number right
- You finish your list most days.
- When you don't, it's because something unusual happened, not because of the plan.
- You end the day knowing what you got done rather than what you didn't.
- The number creeps up over time as tasks get better defined and you protect your focus.
That last one is worth noticing. Capacity isn't fixed. Fewer context switches, clearer tasks and a protected first hour all raise it. But you get there by planning honestly to today's number, not by writing tomorrow's ambitions on today's list.
Try it
Tonight, plan tomorrow with exactly three meaningful tasks and one admin line. Do them in order. If you finish early, add one more. At the end of the week, see how it felt compared with your usual list. For the bigger routine around this, read how to plan your day.
Frequently asked questions
How many tasks should be on a daily to-do list?
Three to five meaningful tasks is a good starting point, plus a few small fixed jobs. Adjust after a week based on how many you actually finish.
Why do I never finish my to-do list?
Usually because the list holds more than a day can, or because tasks are too big to finish in one go. Plan fewer, smaller tasks and leave room for interruptions.
Should small tasks count?
Group them. "Reply to five emails" or "admin batch" counts as one item, rather than five lines that crowd out important work.