# Field Strength Estimator > Estimates radio field strength and power flux density based on transmission parameters. (iPhone/iPad app by Rohde & Schwarz GmbH & Co. KG.) - Source: https://appshunter.io/ios/app/field-strength-estimator/id364229792 (this page in markdown: same URL + `.md`) - Developer: [Rohde & Schwarz GmbH & Co. KG](https://appshunter.io/developer/364229795) - Category: Productivity, Business - Price: Free - Rating: 4.30/5 from 4 App Store ratings · 3 written reviews indexed - Age rating: 4+ - Requires: iOS 8.0 · 72 MB - Languages: American English - Released: 2010-03-26 - Data updated: 2026-06-05 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/field-strength-estimator/id364229792/reviews.md ## What is Field Strength Estimator? The program Field Strength and Power Estimator calculates power flux density, electric and magnetic field strength from the transmitted power, associated frequency and gain of the transmitting antenna. Additionally the input power into a receiver with 50 Ohm input impedance is calculated from the gain of the receiving antenna. The program automatically converts power flux density into electric and magnetic field strength. Depending on the transmitted frequency, various parameters influence the received power and field strength, such as non-line-of-sight propagation, changes in polarisation, reflections, and multi-path propagation affect the true values. Additionally antenna VSWR and cable losses have to be considered. The program Field Strength and Power Estimator does not consider these impairments. It assumes conditions, that are close to the best possible theoretical values. This is why we say the program is an Estimator, not a Calculator. This application is based on the application note: "1MA85: Field Strength and Power Estimator" by Rohde & Schwarz GmbH & Co. KG ( http://www.rohde-schwarz.com/appnote/1MA85 ) ## Key features - Calculates power flux density - Estimates electric and magnetic field strength - Calculates received power - Considers antenna gain and transmitted power - Assumes theoretical best-case conditions ## Recent user reviews (3 of 3) All indexed reviews: https://appshunter.io/ios/app/field-strength-estimator/id364229792/reviews.md ### 5/5 — Handy *2024-02-13, version 2.0* This has been my go-to app in field strength and signal level calculation. Use it constantly as it is useful and convenient. ### 5/5 — Use this a lot *2023-12-18* This app is very handy when calculating receiver power and similar parameters. ### 5/5 — Perfect! *2018-07-09, version 2.0* This tool is exactly what’s needed to estimate RF field strength at various power levels, distances and antenna gains. It’s very helpful being able to directly convert between the relevant units like dBm, watts, uV/m, etc. Superbly done. Thank you!! W5FCX ## Frequently asked questions about Field Strength Estimator ### What is Field Strength Estimator used for? Field Strength Estimator calculates theoretical power flux density, electric and magnetic field strength, and received power based on transmission parameters like power, frequency, and antenna gain. It's designed for estimations under ideal conditions. ### Does Field Strength Estimator account for real-world signal impairments? No, Field Strength Estimator explicitly states it does not consider real-world impairments such as non-line-of-sight propagation, reflections, or multi-path propagation. It provides theoretical best-case values. ### What devices is Field Strength Estimator available on? Field Strength Estimator is available for iPhone, iPad, and iPod devices. It was last updated in January 2018. ### How accurate are the estimations from Field Strength Estimator? The app is an 'Estimator' and assumes conditions close to the best possible theoretical values. It does not account for real-world factors that would affect actual signal strength. ### What is the age rating for Field Strength Estimator? Field Strength Estimator has an age rating of 4+, making it suitable for a wide audience. It was released in March 2010. ### Is Field Strength Estimator free to use? Yes, Field Strength Estimator is available for free. There are no in-app purchases or advertisements mentioned for this application. ### How often is Field Strength Estimator updated? The latest version of Field Strength Estimator is 2.0, which was released on January 25, 2018. Updates may be infrequent as it is an older application. ### What is the user sentiment for Field Strength Estimator based on ratings? Field Strength Estimator has a rating of 4.3 stars from 4 ratings. This indicates generally positive user reception based on the limited feedback available. ## Version history (last 4 releases) ### 2.0 — 2018-01-25 This app has been updated by Apple to display the Apple Watch app icon. - new Look & Feel - iPad support - adaptive UI - 64 Bit support ### 1.2.1 — 2012-04-03 Improvements of calculation accuracy. GUI improvements ### 1.2 — 2011-04-26 Adaptation to Rohde & Schwarz mobile CI ### 1.1 — 2010-03-26 No release notes. ## Apps similar to Field Strength Estimator | App | Rating | Price | Category | | --- | --- | --- | --- | | [Electrocalc - electronics App](https://appshunter.io/ios/app/electrocalc-electronics-app/id1583972990) | 4.0 (4) | Free | Productivity | | [Radio Frequency Power Loss](https://appshunter.io/ios/app/radio-frequency-power-loss/id412782595) | 1.0 (1) | $0.99 | Productivity | | [splotRF](https://appshunter.io/ios/app/splotrf/id1599892560) | 5.0 (2) | Free | Productivity | | [DragonForce 3.30](https://appshunter.io/ios/app/dragonforce-330/id1471028324) | 5.0 (6) | Free | Productivity | | [iSmith](https://appshunter.io/ios/app/ismith/id6444874930) | 5.0 (1) | Free | Productivity | | [Smith Charts](https://appshunter.io/ios/app/smith-charts/id1602503719) | 3.7 (3) | $3.99 | Productivity | ## More apps by Rohde & Schwarz GmbH & Co. KG - [dB Calculator](https://appshunter.io/ios/app/db-calculator/id489100786) - [Wireless Comm. Calculator](https://appshunter.io/ios/app/wireless-comm-calculator/id544183863) - [Pulsed RF Calculator](https://appshunter.io/ios/app/pulsed-rf-calculator/id969034080) - [R&S PQA](https://appshunter.io/ios/app/r-and-s-pqa/id1109979691) - [R&S MobileView](https://appshunter.io/ios/app/r-and-s-mobileview/id1186696896) All apps by Rohde & Schwarz GmbH & Co. KG: https://appshunter.io/developer/364229795 --- *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 2026-06-05.*