Quickly calculate project durations, start dates, or end dates based on a given number of weeks. This tool adheres to the ISO 8601 standard for accurate scheduling.


246+ iOS apps curated and reviewed
If you already know Calendar Week Calculator, this is the deeper bench. 246+ calendar week calculator apps for iPhone, all reviewed and ranked by user rating, recency, and download trend as of October 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 | Free | — | No | No | May 2026 | ||
| 2 | Free | 4.7★ (9.9K) | Yes | No | Oct 2026 | ||
| 3 | Free | 4.4★ (10K) | Yes | Yes | Oct 2026 | ||
| 4 | Free | 4.7★ (876) | Yes | No | Oct 2026 | ||
| 5 | Free | — | No | No | May 2026 | ||
| 6 | Free | 4.3★ (3) | No | No | Oct 2026 | ||
| 7 | $0.99 | — | No | No | Oct 2026 | ||
| 8 | Free | 3.3★ (13) | Yes | Yes | Oct 2026 |


Quickly calculate project durations, start dates, or end dates based on a given number of weeks. This tool adheres to the ISO 8601 standard for accurate scheduling.



Calculate the exact number of days, hours, and seconds between any two dates. This tool also allows you to find the date before or after a specified period, making it useful for tracking deadlines, events, or financial products.






This app offers a highly customizable calendar experience with multiple view options and automation tools. It allows for easy event management, integration with popular calendar services, and includes features like weather forecasts and calendar insights. An optional Pro version unlocks additional widgets and features.