# ESPR Calculator — Erection Size Percentile Rank > App to assess erection size and rank against the adult male population. (iPhone/iPad app by OhsOwn LLC.) - Source: https://appshunter.io/ios/app/espr-calculator/id1482061603 (this page in markdown: same URL + `.md`) - Developer: [OhsOwn LLC](https://appshunter.io/developer/1482061602) - Category: Entertainment - Price: $0.99 - Rating: 4.50/5 from 2 App Store ratings · 1 written reviews indexed - Age rating: 12+ - Requires: iOS 12.2 · 0 MB - Languages: English - Released: 2019-10-04 - Data updated: 2026-06-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/espr-calculator/id1482061603/reviews.md ## What is ESPR Calculator? Conceived, designed, and produced entirely by a retired career urologist, ESPR (Erection Size Percentile Rank) Calculator is a simple, discreet app which gives a man the ability to assess his total erection size and rank compared to the overall adult male population. By using publicly available historical research erection size data and combining this with some logical assumptions regarding statistical distribution and penile geometry, an easy-to-understand percentile scoring system ranking overall erection size was created - ESPR.   How and why is ESPR better? More thorough - Most reports of erection size focus only on length. However, girth is actually a more important contributor to overall penile volume. ESPR takes both length and girth into account and thus gives a better representation of overall penile size. More informative - Prior to ESPR, erection sizes were classified along the lines of "small" or "about average" or "huge", etc. Now, with ESPR, a man can have a much more accurate sense of how he actually measures up; not only with the percentile-based score system, but also by being able to directly compare size against multiple different reference objects as well. More inclusive - Measurements of erection size done in a clinical setting by a health care professional have been shown to be consistently smaller than self-reported assessments done at home, and almost all reports of erection size data exclude the latter category. ESPR includes both categories of data in its final algorithm as the true answer almost certainly lies somewhere in between. More precise - The vast majority of erection size data that is available on the internet is actually based on research that in large part relied on stretched-penile length estimations instead of actual erection length. In contrast, ESPR only takes into account research that directly assessed erection size. More adaptable - Once results from a research study are reported, that's it; those findings don't really change afterwards. ESPR, however, can be easily updated and refined as ongoing new research data or other pertinent information becomes available to continue to try to improve its accuracy. All the user has to do is enter the requested data and press calculate. Measurements can be done in either inches or centimeters. The app will calculate the estimated erection size and rank by comparing the user data against the historical data, then present this information along with some other analysis in a straightforward result dialog. The application is completely private and secure with absolutely no advertisements, tracking, or analytics ability. No user information of any kind is ever obtained or recorded.   ESPR Calculator is compatible with both phones and tablets, and fully functional in both portrait and landscape modes. ESPR Calculator is not intended to provide any medical/health diagnosis or advice. The information provided by the application is provided for general informational and educational purposes only and is meant to be enjoyed for entertainment. ## Key features - Percentile scoring system - Considers length and girth - Compares to reference objects - Includes clinical and self-reported data - Uses actual erection size data - Adaptable with new research ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/espr-calculator/id1482061603/reviews.md ### 4/5 — Simple to the Point *2019-10-04, version 1.0* I’m not as bad as I thought I was. Could use a little spicing up but over all for a buck worth the ease of mind, I’m normal...even above average. ## Frequently asked questions about ESPR Calculator ### What is ESPR Calculator? ESPR Calculator is a paid app designed to help men assess their erection size and rank it against the adult male population using a percentile scoring system. It was developed by a retired urologist and considers both length and girth. ### How does ESPR Calculator calculate percentile rank? It uses publicly available historical research data on erection size, combining it with statistical distribution and penile geometry assumptions to create an easy-to-understand percentile score. The app considers both length and girth for a more thorough analysis. ### Does ESPR Calculator provide medical advice? No, ESPR Calculator is not intended to provide any medical or health diagnosis or advice. The information it provides is for general informational purposes only. ### What devices is ESPR Calculator compatible with? ESPR Calculator is compatible with iPhones, iPads, and iPods. It is fully functional in both portrait and landscape modes on phones and tablets. ### Is ESPR Calculator private and secure? Yes, the application is completely private and secure. It has absolutely no advertisements, tracking, or analytics capabilities, and no user information is ever obtained or recorded. ### What is the price of ESPR Calculator? ESPR Calculator is a paid app priced at $0.99. It does not contain advertisements or in-app purchases. ### How often is ESPR Calculator updated? ESPR Calculator was last updated on October 31, 2019, to version 2.1. The app is designed to be adaptable and can be refined as new research data becomes available. ### What is the age rating for ESPR Calculator? ESPR Calculator has an age rating of 12+. This indicates it is suitable for users aged 12 and older. ## Version history (last 1 release) ### 2.1 — 2019-10-31 Added additional reference erection sizes to compare size against while eliminating the non-erection reference objects to increase more practical informational utility. Restructured result dialog to make the information easier to understand in general. ## Apps similar to ESPR Calculator | App | Rating | Price | Category | | --- | --- | --- | --- | | [SBB View](https://appshunter.io/ios/app/sbb-view/id1564126980) | 2.6 (14) | Free | Entertainment | | [Juicebox Community](https://appshunter.io/ios/app/juicebox-community/id1570134279) | 3.0 (2) | Free | Entertainment | | [&Jane](https://appshunter.io/ios/app/and-jane/id1530801648) | 2.6 (18) | Free | Entertainment | | [IFT Network TV](https://appshunter.io/ios/app/ift-network-tv/id1556631800) | 5.0 (5) | Free | Entertainment | | [IWC Schaffhausen App](https://appshunter.io/ios/app/iwc-schaffhausen-app/id1558418880) | 4.7 (1,329) | Free | Entertainment | | [Smile Clinic](https://appshunter.io/ios/app/smile-clinic/id1561754380) | — | Free | Entertainment | ## More apps by OhsOwn LLC - [ESPR Calc Free](https://appshunter.io/ios/app/espr-calc-free/id1484292990) All apps by OhsOwn LLC: https://appshunter.io/developer/1482061602 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*