Comprehensive Calculator Guide
The Pomodoro calculator splits the focus time you need into short sessions with breaks and gives you a timetable and a finish time. Four hours of focus is 10 sessions of 25 minutes with 7 short and 2 long breaks; starting at 8:00 you finish at 13:15. Change the session and break lengths to suit you.
The technique and the arithmetic
Francesco Cirillo devised it in the late 1980s, naming it after a tomato-shaped kitchen timer: 25 minutes of single-task focus, 5 minutes’ rest, and a longer break after every four sessions.
The calculator divides your focus time by the session length, rounding up; puts a long break after each set and short breaks elsewhere, none after the last session; and adds the total to your start time.
How to Use
- Enter the focus time you need in hours, and your start time.
- Adjust session and break lengths if you like.
- Press “Plan my sessions” to see the sessions, breaks, finish time and timetable.
Formula Used
Sessions = ⌈focus time ÷ session length⌉ | Long breaks = ⌊(sessions − 1) ÷ every⌋ | Short = sessions − 1 − long
Practical Examples
- Example 1
- 4 hours from 8:00 at 25 minutes: 10 sessions, 65 minutes of breaks, finish 13:15.
- Example 2
- 2 hours from 16:00 at 50 minutes with 10-minute breaks: 3 sessions, finish 18:50.
Important Tips
- Name one specific task before each session.
Common Mistakes to Avoid
- Skipping breaks and burning out two hours in.
Frequently Asked Questions
- How long is a pomodoro?
- 25 minutes of focus and 5 of rest, with a 15–30 minute break after four.
- How many pomodoros in 4 hours?
- About 10, taking around 5¼ hours with breaks.
- Does it work for studying?
- Yes — it’s one of the most popular ways to structure study.