1-3-5 Task Prioritization Calculator
Time Breakdown
| Big Task (1) | 120 min |
| Medium Tasks (3) | 135 min |
| Small Tasks (5) | 75 min |
| Planned Task Time | 330 min |
| Interruptions & Buffer | 30 min |
| Total Planned Time | 6.0 hrs (360 min) |
| Available Time Today | 8.0 hrs (480 min) |
| Day Utilization | 75.0% |
| Total Planned Time | 6.0 hrs |
Summary Statistics
What Is the 1-3-5 Method?
The 1-3-5 method is a daily planning system built on a deliberately small structure: one big task that must be completed, three medium tasks that move meaningful projects forward, and five small tasks that clear the little things. The method exists because unconstrained to-do lists fail in a predictable way — everything on the list looks equally urgent, the big task gets postponed because it feels heavy, and the day ends with ten half-finished items instead of one finished one. By capping the plan at nine items and forcing a single headline task, the 1-3-5 method turns planning into triage: the big task defines the day's real objective, the three medium tasks protect progress on secondary goals, and the five small tasks keep logistics from rotting. This calculator applies a time budget to that structure, so you can see not just what is on the list but whether the list fits the hours you actually have. The one-big-task rule is the part people skip first, which is exactly why the big task gets its own dedicated time input and its own share-of-day statistic in the results.
How the Time Budget Is Calculated
The calculation converts each tier of the plan into minutes and stacks them into a single daily budget. The big task is entered in hours and converted to minutes — two hours becomes 120 minutes. The medium tier multiplies the number of medium tasks by the minutes allotted to each one, so three tasks at 45 minutes each contribute 135 minutes. The small tier works the same way, five tasks at 15 minutes each adding 75 minutes. The three tier subtotals sum to the planned task time, and the interruption buffer — a reserve for email, meetings, and the unplanned — is added on top to produce the total planned time for the day. The feasibility check then divides that total by the available working hours: a 5.5-hour plan inside an 8-hour day is 68.75 percent utilization, leaving a visible buffer; a plan that exceeds the available hours goes over 100 percent and is flagged. The big-task share divides the big task's minutes by the total planned time, showing how much of the day the headline objective consumes — the statistic that keeps the method honest, because a plan with a small big-task share is usually a plan that deferred the real work. Every row in the breakdown traces back to one of the inputs, so adjusting the buffer, the task counts, or the per-task times flows through to the total, the utilization, and the final fit verdict in a single calculation.
Understanding Your Results
Read the results in one glance: the total planned time tells you whether the day is realistically full, and the fit banner at the bottom gives the verdict — spare minutes if the plan fits, or an overrun figure if it does not. When the plan overruns, the breakdown shows exactly which tier to cut: reducing the interruption buffer and the small-task time are the least costly levers, while shrinking the big task means renegotiating the day's real objective. The big-task share deserves deliberate attention — if the headline task consumes less than a third of the day, the plan is probably weighted toward small wins, and the method's entire premise is that the big task comes first. The day-utilization figure has a practical ceiling: sustained plans above 85 percent of available time leave no room for the interruptions that always arrive, which is why the buffer input exists and why the default plan sits comfortably below capacity. Re-run the calculation whenever scope changes mid-day — the calculator is designed to be rebalanced, not just built once in the morning. Used daily, the 1-3-5 structure turns an overwhelming list into a bounded, reviewable plan, and the time budget makes the trade-offs explicit before you commit to the day rather than after it has escaped you.
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