# Perfect OB Wheel

> Obstetrics calculator

Canonical page: [https://chrome-stats.com/d/id293656711](https://chrome-stats.com/d/id293656711)

## Overview

- **ID:** `id293656711`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Evan Schoenberg
- **Category:** Medical
- **Rating:** 4.90 / 5 (3,593 ratings)
- **Version:** 59.1
- **Last updated:** 2026-08-11
- **First published:** 2008-10-16
- **Size:** 14 MB
- **Data as of:** 2026-09-25
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/perfect-ob-wheel/id293656711)
- **Website:** [http://www.perfectobwheel.com](http://www.perfectobwheel.com/)
- **Privacy policy:** [https://regularrateandrhythm.com/privacy-policy.html](https://regularrateandrhythm.com/privacy-policy.html)

## Description

Perfect OB Wheel is a fast, thorough obstetrics calculator for pregnancy planning. It supports multiple input methods—LMP, conception date, EDC, and ultrasound dating—and lets you enter data via a numeric keypad or a bottom date wheel for rapid results.

The app delivers comprehensive results, including Estimated Due Date, LMP, Conception Date, 1st and 2nd Trimester End Dates, Gestational Age, Conceptional Age, and estimated fetal length and weight. Results are shown relative to today by default and can be quickly updated to any date. The tool also remembers your last inputs for streamlined workflows. An optional upgrade, Perfect OB Tracker, enables multi-pregnancy tracking, notes, postpartum tracking, and HIPAA-friendly passcode locking for privacy.”

## Rankings

- #29,862 — Overall

## Review summary

Users praise ease of use, speed, and the app's comprehensive, adaptable dating calculations with saved client data, making it a staple in OB practice. Major drawbacks cited are pricing with hidden add-ons, potential dating accuracy issues and lack of cycle-length adjustment, stability problems after updates causing crashes, and readability changes. Some request more infant-data fields. Overall it’s a widely used, trusted tool with a few usability and accuracy caveats.

### Pros

- Very easy to use and user-friendly interface.
- Flexible, fast dating calculations from multiple inputs (LMP, EDD, GA) with data-saving features.
- Indispensable in daily OB practice; saves time and helps prevent lost wheels.
- Widely used and trusted by nurses, midwives, and physicians; highly recommended.
- Notable credibility in the field (mentioned in Green Journal).

### Cons

- Pricing and hidden/extra in-app purchases beyond base price (base $1.99, then $4.99 for full features).
- Dating accuracy concerns (trimester dating off, disagreement with ACOG criteria) and lack of cycle-length adjustment leading to date discrepancies.
- Stability issues after updates; crashes or the app won’t open and can disappear after updates.
- Readability issues due to smaller font.
- Requests for more infant-data fields and additional customization (e.g., cycle-length, APGAR, weight).

## Similar extensions and apps

- [Perfect OB Tracker](https://chrome-stats.com/d/id581826761) — 4.90 / 5
- [OB Pregnancy Wheel Made Easy](https://chrome-stats.com/d/id6757496014) — 5.00 / 5
- [OB Wheel Pregnancy Calculator](https://chrome-stats.com/d/id6746731218) — 5.00 / 5
- [OB Wheels](https://chrome-stats.com/d/id969845527) — 2.30 / 5
- [OB Wheel+](https://chrome-stats.com/d/id6757197344) — 5.00 / 5
- [Preg Wheel](https://chrome-stats.com/d/id445303968) — 4.00 / 5
- [ezPregnancy](https://chrome-stats.com/d/id1035996935) — 3.00 / 5
- [The OB Wheel Pro 7](https://chrome-stats.com/d/id730081554) — 4.00 / 5
- [OB Wheel Due Date Calculator](https://chrome-stats.com/d/id6752916655)
- [OB Wheel](https://chrome-stats.com/d/id6473123188) — 4.30 / 5
- [OB Wheel & EDD Calculator](https://chrome-stats.com/d/id6742823689) — 4.70 / 5
- [OB App Suite](https://chrome-stats.com/d/id933612629) — 3.80 / 5

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Source: [Chrome-Stats](https://chrome-stats.com/d/id293656711)