RandoziSpaced Repetition Schedule Calculator
Pick the day you first learn something and the intervals at which you want to review it. You get the date of every review with its day of the week, can push weekend dates to the next Monday, and can download a calendar file with one all-day reminder per review. Everything is computed in your browser.
Review schedule
5 reminders
Options
| # | Date | Day | Days after start | Note |
|---|---|---|---|---|
| 1 | 2026-11-03 | Tue | 1 | |
| 2 | 2026-11-05 | Thu | 3 | |
| 3 | 2026-11-09 | Mon | 7 | |
| 4 | 2026-11-16 | Mon | 14 | |
| 5 | 2026-12-02 | Wed | 30 |
Days since the start: date = start + interval. Gaps between reviews: each interval is added to the previous review. Dates are calendar days (UTC), up to 60 reminders. The presets are common rules of thumb, not a proven optimum. The calendar file is built in your browser; nothing you type leaves it.
How it works
- Choose the start date and a preset (1-3-7-14-30 or 1-2-4-8-16), or write your own intervals in days.
- Say whether the intervals count days since the start (the default) or the gap between one review and the next.
- Read the dates, and tick the weekend option if you do not want to study on Saturdays and Sundays.
- Copy the dates or download the .ics file and open it in your calendar app.
What people use it for
Studying for an exam
Plan when to revisit a chapter after the first reading so each review comes just as it starts to fade.
Learning vocabulary or a skill
Get a fixed list of review days for each new batch of words, with a reminder in your calendar.
Training habits and recalls
Schedule follow-up check-ins after a lesson, a course or a first session.
Questions
- How are the review dates calculated?
- In “days since the start” mode each interval is added to the start date: starting on 2026-11-01 with 1 and 3 gives 2026-11-02 and 2026-11-04. In “gaps between reviews” mode the intervals add up: the same 1 and 3 give 2026-11-02 and then 2026-11-05. Dates are calendar days, so month ends and 29 February come out right.
- Are these intervals scientifically the best?
- No. The 1-3-7-14-30 and 1-2-4-8-16 presets are common study rules of thumb, not a proven optimum for you or for every subject. Spacing out reviews tends to help memory, but the right rhythm depends on the material, and you can write your own intervals.
- What does moving weekends do?
- A review that falls on a Saturday or a Sunday is moved to the Monday after. The original date stays visible in the table, and the .ics file uses the moved date. Two reviews can then land on the same Monday.
- What is in the calendar file?
- One all-day event per review, titled “Review 1/5”, “Review 2/5” and so on, with your optional title in front. It is built in your browser and downloaded directly; nothing is uploaded. Limits: up to 60 reminders, each interval from 0 to 3,650 days.