Focus & productivity
Time blocking calculator
Enter your start and finish times and a block length to see how many focus blocks fit your day and when each starts.
This calculator leaves a 15-minute gap after each block for breaks, buffer and overruns. Reserve your sharpest hours for your most demanding work.
What time blocking does
Time blocking turns an open calendar into a sequence of named appointments with yourself. Instead of reacting to whatever lands in your inbox, you decide in advance when each piece of work happens. The calculator divides your working window into equal focus blocks, adds a short gap after each one for breaks and overruns, and shows the start time for every block.
| Block length | Best for |
|---|---|
| 25-45 minutes | Admin, email batches, quick tasks |
| 60-90 minutes | Writing, coding, analysis, design |
| 90-120 minutes | Deep work when you can protect the time |
How to use your blocks
Give each block a single clear outcome before it starts, not a vague theme. Put the work that needs the most concentration early, while your energy is highest, and leave lighter tasks for the afternoon dip. Guard the gaps between blocks as real rest, because switching straight from one task to the next leaves attention residue that slows you down. If a block runs over, let the buffer absorb it rather than stealing from the next block. Review your plan at the end of the day and adjust block length until the schedule matches how you actually work.
Frequently asked questions
How long should each block be?
Match the block to the task. Sixty to ninety minutes suits most focused work because it is long enough to make progress but short enough to stay sharp. Use shorter blocks for admin.
Why does the calculator leave gaps between blocks?
A 15-minute gap after each block gives you time to rest, handle anything urgent and absorb overruns. Back-to-back blocks look efficient but collapse the moment one task runs long.
What if meetings break up my day?
Block around fixed meetings first, then fill the remaining windows. Even two protected blocks a day beats an open calendar where focused work never gets a reserved slot.