CronKit

0 */3 * * * explained

On the hour, every 3 hours

On the hour, every 3 hours
The cron expression 0 */3 * * *. · 5-field cron

Next 5 runs (UTC)

#Run time (UTC)When
1Thu, Sep 17, 2026, 09:00:00 UTCin 2h 6m
2Thu, Sep 17, 2026, 12:00:00 UTCin 5h 6m
3Thu, Sep 17, 2026, 15:00:00 UTCin 8h 6m
4Thu, Sep 17, 2026, 18:00:00 UTCin 11h 6m
5Thu, Sep 17, 2026, 21:00:00 UTCin 14h 6m

Try it in your timezone

0 */3 * * *
Get this as JSON (developer API)
curl "https://cron.wrapper-agency.com/api/v1/cron?expr=0%20*%2F3%20*%20*%20*&tz=UTC"

Free cron API — no key during beta. Parsing is standard 5-field (or 6-field with seconds) cron, computed with cron-parser.

How to read this expression

FieldValueMeaning
Minute0exactly 0
Hour*/3every 3 step
Day of month*every value
Month*every value
Day of week*every value

Related schedules

0 0 1 */3 *
Quarterly (1st, every 3 months)
0 8 1-7 * 1
Day 1–7 and on Monday at 8 AM

FAQ

Is "0 */3 * * *" a valid cron expression?
Yes — it parses as a standard 5-field cron expression: On the hour, every 3 hours.
How do I use it?
Paste it into your crontab, CI scheduler, or job runner. Need a different schedule? Edit the fields in the builder above or browse all common cron expressions.

Looking for a phrase instead? See every minute, every 5 minutes, every 10 minutes, every 15 minutes.