# Multiplier HD — Predict height & bone length > Medical calculator for predicting child height, bone length, and limb discrepancies. (iPhone/iPad app by LifeBridge Health.) - Source: https://appshunter.io/ios/app/multiplier-hd/id460343565 (this page in markdown: same URL + `.md`) - Developer: [LifeBridge Health](https://appshunter.io/developer/460335164) - Category: Medical, Health & Fitness - Price: Free - Rating: 1.00/5 from 1 App Store ratings · 4 written reviews indexed - Age rating: 12+ - Requires: iOS 8.0 · 56 MB - Languages: American English - Released: 2011-09-07 - Data updated: 2026-06-01 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/multiplier-hd/id460343565/reviews.md ## What is Multiplier HD? -The Multiplier App automates calculations to predict mature height and bone length in children. This method was created originally in Baltimore at the University of Maryland, and subsequently developed at the International Center for Limb Lengthening (ICLL), Rubin Institute for Advanced Orthopedics (RIAO), Sinai Hospital of Baltimore. -We have taught the Multiplier Method for more than 19 years at our annual Baltimore Limb Deformity Course (www.DeformityCourse.com). These calculations are typically performed by hand, using various formulae. Certain calculations are easy, but others involve more complicated formulae. Utilizing this app will reduce the time needed for these routine calculations and decrease errors. You need only input certain data (sex, age, length) and the app will calculate the answer by using the appropriate Multiplier formula. The Multiplier App will allow you to make the following calculations: • Lower Extremity - Limb Length Discrepancy (LLD) (Congenital) - LLD (Developmental) - Growth Remaining - Bone Length - Timing of Angular Correction - Timing of Epiphysiodesis - Comprehensive (Congenital) LLD and Epiphysiodesis -Scanogram Calculations (calculates femur/tibia lengths, overall limb length discrepancy, and amount/side of femur/tibia discrepancies) • Upper Extremity - LLD (Congenital) - LLD (Developmental) - Growth Remaining - Bone Length • Height and CDC Growth Charts (calculates height at maturity, calculates height at every age, and plots the patient’s height and weight on the CDC growth charts) • Achondroplasia - Height - Sitting Height - Leg Length • Fetus (calculates the length of tibia or femur at birth and maturity) • Foot - Foot Length - Foot Length Discrepancy • Spine (calculates sitting height at maturity) • Oblique Plane Deformity (calculates magnitude, orientation, and direction of an oblique plane deformity) • Inclined Osteotomy (calculates the rotational orientation and the vertical inclination of the osteotomy) This app also provides the following additional resources: -Bone Age: Elbow and Hand (shows how to determine skeletal age by using radiographs of the elbow or hand) -Figures that show the standard measurements for the lower limb and foot -The multiplier formulae that the app uses to perform the calculations -Tables that show the multiplier values that are used in the formulae -Figures that show the Solomin Foot Analysis (deformity correction planning for the midfoot, hindfoot, and ankle using reference lines and angles provided by Dr. Leonid Solomin) -Figures that show the development of the apophyses, epiphyses, and bones -Bibliography -User guide Disclaimer: No growth prediction method is 100% accurate; this App is not a substitute for sound and careful clinical judgment. Privacy Policy: We respect the privacy of the people who use International Center for Limb Lengthening apps. The Multiplier app does not collect, use or distribute any data from the users. ## Key features - Predict mature height and bone length - Calculate limb length discrepancy - Estimate growth remaining - Analyze achondroplasia and fetal growth - Perform scanogram calculations - Determine skeletal age via radiographs - Access medical figures and bibliographies ## Recent user reviews (4 of 4) All indexed reviews: https://appshunter.io/ios/app/multiplier-hd/id460343565/reviews.md ### 5/5 — Great app *2016-02-20* Great app. Very useful for patient and family counseling ### 5/5 — Great app *2014-02-20* Extremely useful, we'll-designed ### 5/5 — Nice update for the Multiplier *2012-08-31* Great new update to an already invaluable App that I use daily in my Pediatric Orthopedic Surgery practice. I especially like the new features that allow me to email calculation results to my secretary to file in the chart. The new calculations that display lengths at "every age" may become very useful for discussions with parents about future plans. Many thanks to the team at Sinai Hospital for updating this free App! ### 5/5 — Extremely useful *2011-11-07* This is an excellent app and easily replaces the dusty laminated charts which have cluttered clinic rooms in the past. The developers are approachable and replied within 24 hours to my enquiries. An update is on the way in the near future. Highly recommended for all Paediatric Orthopaedic surgeons. ## Frequently asked questions about Multiplier HD ### What is Multiplier HD used for? Multiplier HD is a medical application designed to automate complex calculations for predicting a child's mature height and bone length. It assists healthcare professionals in various orthopedic calculations, including limb length discrepancy and growth remaining. ### What types of calculations can Multiplier HD perform? Multiplier HD can perform a wide range of calculations, including lower and upper extremity limb length discrepancy, growth remaining, bone length, timing of angular correction, and scanogram calculations. It also supports height and CDC growth chart plotting, achondroplasia measurements, fetal length prediction, and foot/spine measurements. ### Does Multiplier HD provide information on skeletal age? Yes, Multiplier HD includes resources for determining skeletal age by showing how to use radiographs of the elbow and hand. It also provides figures illustrating the development of apophyses, epiphyses, and bones. ### Is Multiplier HD accurate for all growth predictions? The app includes a disclaimer stating that no growth prediction method is 100% accurate. It emphasizes that Multiplier HD is a tool to assist clinical judgment and not a substitute for sound medical practice. ### What additional resources are available in Multiplier HD? Beyond calculations, Multiplier HD offers figures for standard limb and foot measurements, the multiplier formulae used, tables of multiplier values, the Solomin Foot Analysis, and a bibliography. A user guide is also included. ### Does Multiplier HD collect user data? No, Multiplier HD respects user privacy and does not collect, use, or distribute any data from its users. This aligns with the privacy policy of International Center for Limb Lengthening apps. ### What is the update frequency of Multiplier HD? Multiplier HD was last updated on August 16, 2019, with version 7.0. The initial release date was September 7, 2011. Users can expect updates to refine features and maintain compatibility. ### Is Multiplier HD available on multiple devices? Based on the provided data, Multiplier HD is supported on iPads. Information regarding availability on other Apple devices or Android platforms is not specified. ## Version history (last 5 releases) ### 7.0 — 2019-08-16 We added “Scanogram Calculations” under “Lower Extremity.” After entering the scanogram measurements, the screen will calculate the lengths of the individual femora and tibiae as well as the overall discrepancy for the limbs (using the femoral and tibial discrepancies). It will also provide the amount of each tibial and femoral discrepancy and whether each discrepancy is present on the right side or the left side. Under “Additional Resources,” we have added a new section called “Solomin Foot Analysis” that shows deformity correction planning for the midfoot, hindfoot, and ankle using reference lines and angles provided by Dr. Leonid Solomin. We improved the formatting of the data entry screens to reduce errors when inputting data. For example, units of length (cm or inches) no longer have a default unit selected; the user must choose the unit of length. We improved the formatting of the results screens to reduce errors in interpreting data. The Multiplier has been upgraded to support the latest iOS and improve its performance. ### 6.3.1 — 2018-11-02 We have corrected an issue with a data entry screen. ### 6.3 — 2018-08-09 The Multiplier has been upgraded to support the latest iOS and improve its performance. We changed the formatting of several results screens to make them easier to read and understand. We revised the content and improved the formatting of many of the help menus. We updated the bibliography that is located in the Additional Resources section and included links to each article’s abstract on PubMed. ### 6.0 — 2017-01-03 We changed the formatting of several results screens to make them easier to read and understand. If you decide to e-mail the results of the calculations, we have improved the content and the formatting of these e-mails. The Additional Resources section now includes the latest illustrations for the normal angles and measurements of the foot. We revised the content and improved the formatting of many of the help menus. We added a new article to the bibliography list that is located in the Additional Resources section. This 2016 article is a research study that was published in the Journal of Pediatric Orthopaedics that evaluates the use of the Multiplier App to predict growth and epiphysiodesis. The app is now optimized for iOS 10. ### 5.1 — 2016-06-03 Fixed a bug that would not allow you to enter certain prior lengthening amounts when you were calculating LLD. ## Apps similar to Multiplier HD | App | Rating | Price | Category | | --- | --- | --- | --- | | [Bullets*](https://appshunter.io/ios/app/bullets/id1046432285) | 4.3 (55) | Free | Medical | | [CenterEdgeAngleApp](https://appshunter.io/ios/app/centeredgeangleapp/id1294128204) | — | $2.99 | Medical | | [CTisus: CT of the Hand & Wrist](https://appshunter.io/ios/app/ctisus-ct-of-the-hand-and-wrist/id758191884) | 4.8 (5) | Free | Medical | | [Orthopedic Classification](https://appshunter.io/ios/app/orthopedic-classification/id6444741886) | — | $12.99 | Medical | | [AO Trauma Orthogeriatrics](https://appshunter.io/ios/app/ao-trauma-orthogeriatrics/id903074010) | 5.0 (2) | Free | Medical | | [myAO](https://appshunter.io/ios/app/myao/id580462911) | 3.8 (16) | Free | Medical | ## More apps by LifeBridge Health - [Multiplier](https://appshunter.io/ios/app/multiplier/id460335161) - [Bone Ninja](https://appshunter.io/ios/app/bone-ninja/id554151432) - [LifeBridge Health](https://appshunter.io/ios/app/lifebridge-health/id1611570941) - [Bone Ninja Sensei](https://appshunter.io/ios/app/bone-ninja-sensei/id6450483301) All apps by LifeBridge Health: https://appshunter.io/developer/460335164 --- *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 2026-06-01.*