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About this tool
Plan daily work with real-time draggable time blocks, reminders, notes, dashboard stats, filters, and local autosave.
Time blocking is the practice of assigning every hour of the working day to a named task in advance, so the calendar — not the inbox — decides what happens next. This planner turns a list of blocks into the numbers that matter: booked minutes against the length of your day, overlapping appointments, gaps too short to use, and the longest stretch of uninterrupted focus you have actually protected. It is for anyone running a maker schedule who wants the plan checked before the day starts.
Open Time Blocking Planner on AltFTool — it loads instantly in your browser.
Set 'Day starts' and 'Day ends' (defaults 09:00-18:00), then press 'Add block' and give each block a Title, Start, End, Category (Deep work, Shallow / admin, Meeting, Break or Personal) and Priority.
Drag blocks on the Day timeline or nudge a focused block with the arrow keys - they snap to 5-minute steps - and watch the Day utilisation card update Focus time, Breaks, Longest focus run and dead gaps under 15 minutes.
Press 'Copy day plan' to put the summary on your clipboard - the button flashes 'Copied!' - or Reset to restore the default day; the plan autosaves to browser local storage.
Every pair of blocks is compared, so a double booking is flagged with the exact overlap in minutes.
Recommended break time is sized from the 52/17 work-rest rhythm, not a guess.
The day autosaves to browser local storage; nothing is sent anywhere.
Aim for 60-80% booked, not 100%. Leaving a fifth of the day unblocked absorbs the overruns, the urgent request and the task that turns out to be twice as big as you thought — without that buffer, one slipped block cascades through everything after it.
Long enough to reach depth and short enough to finish: 60 to 120 minutes for focused work. This planner treats anything under 5 minutes as invalid and flags gaps under 15 minutes as dead time, because a quarter of an hour is roughly the floor for starting something that needs concentration.
About four hours is the practical ceiling. Cal Newport's Deep Work puts the limit at roughly one hour a day for beginners and up to four for experienced practitioners, so this tool warns once your deep-work blocks pass 240 minutes.
Roughly 17 minutes of break for every 52 minutes of work — about a third. That ratio comes from DeskTime's 2014 analysis of its most productive 10% of users, and it is what the planner uses to size the recommended break total against the focus time you have scheduled.