# Cron Next Run Calculator

> See the next fire times for a cron expression, with each field explained.

A cron expression has five fields — minute, hour, day of month, month and weekday — and this calculator expands them to show exactly when a job next runs. It handles ranges, steps, lists, month and day names, @daily shortcuts, and the rule that day-of-month and day-of-week combine with OR rather than AND.

**URL:** https://convertto.tech/t/cron-next-run
**Category:** Developer Tools (https://convertto.tech/c/developer-tools)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Supports:** Ranges, steps, lists, names, six-field second precision and @daily shortcuts
- **Handles the OR rule:** Day-of-month and day-of-week are ORed when both are restricted
- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Enter or paste your cron expression.
2. Set the show next.
3. Enter or paste your starting from.
4. Turn "Six fields (seconds first)" on or off as needed.
5. The result appears immediately — copy or download it.

## FAQ

### Why does my job run more often than expected?

Almost always the day-of-month and day-of-week OR rule. If both fields are restricted, cron fires when either matches — so "0 0 13 * FRI" runs on the 13th of every month and on every Friday, not only on Friday the 13th.

### What does */15 mean?

Every 15 units counting from the lowest value in the range. In the minute field that gives :00, :15, :30 and :45 — it is a step, not "every 15 minutes from now".

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