---
title: "Four To Twenty: mA/V Converter - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "A simple calculator for converting electrical signals, typically 4-20mA scaled to an appropriate process signal (ex: 0-1000 psi).   Choose from a wide variety of preset signal inputs and process signa"
---

# Four To Twenty: mA/V Converter — United States
> 4-20mA Process Signal Scaling

![Four To Twenty App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple124/v4/3c/ef/06/3cef06b4-8dca-8c9a-55c0-4b7ec6e3c2c3/AppIcon-0-0-1x_U007emarketing-0-0-0-10-0-0-sRGB-0-0-0-GLES2_U002c0-512MB-85-220-0-0.png/434x0w.png)

**Developer:** [Jon Giambattista](https://apptail.io/developer/jon-giambattista-Qsj)
**Category:** Utilities
**Rating:** 4.6/5 (11 ratings)
**Price:** $0.99
**Bundle ID:** com.JonGiambi.FourToTwenty
**Store:** Apple App Store
**Country:** United States
**Version:** 2.0 (released 2020-10-09)
**Original Release:** 2017-10-30
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id1302909664)
**AppTail Page:** [https://apptail.io/app/four-to-twenty-mav-converter-KSXi/united-states](https://apptail.io/app/four-to-twenty-mav-converter-KSXi/united-states)

## Four To Twenty Description
A simple calculator for converting electrical signals, typically 4-20mA scaled to an appropriate process signal (ex: 0-1000 psi). 

Choose from a wide variety of preset signal inputs and process signal outputs or enter your own custom values.

Choose from 8 different themes.

## Four To Twenty Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource124/v4/13/98/df/1398df88-ee83-55d4-eb6a-46bc58e16587/d7337ca2-0b0f-4c6d-ad06-b09f180e3b80_Simulator_Screen_Shot_-_iPhone_Xs_Max_-_2020-10-08_at_22.48.03.png/1242x2688.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource124/v4/bb/a5/d5/bba5d572-a084-2a8b-71d7-b6a80b6b5a1c/97e94b12-3751-4b71-b842-ca5096bd208a_Simulator_Screen_Shot_-_iPhone_Xs_Max_-_2020-10-08_at_22.48.22.png/1242x2688.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource124/v4/f5/4d/43/f54d43d5-8f4b-f297-9143-28aa7decb5be/2dd4d1f4-62b2-4860-be81-106e481e96e1_Simulator_Screen_Shot_-_iPhone_Xs_Max_-_2020-10-08_at_22.58.12.png/1242x2688.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource114/v4/9b/ce/38/9bce3818-b937-a328-0630-22d29ef4bc7f/1d81058f-2236-4855-ad32-cc76da280616_Simulator_Screen_Shot_-_iPhone_Xs_Max_-_2020-10-08_at_22.58.16.png/1242x2688.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource114/v4/3e/30/c2/3e30c272-395f-55ad-9a55-aaf0023f30e6/29a9f2a7-61b3-4ce6-a05c-9f8e3627af87_Simulator_Screen_Shot_-_iPhone_11_Pro_Max_-_2020-10-09_at_10.03.56.png/1242x2688.png)
- [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource124/v4/8c/44/cc/8c44cc6e-ec7c-ed7d-ddea-802c3a6a1473/8e3c3843-deaa-46a0-a6a9-9cd7e46397ce_Simulator_Screen_Shot_-_iPhone_11_Pro_Max_-_2020-10-09_at_10.31.23.png/1242x2688.png)
- [Screenshot 7](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource124/v4/48/45/e1/4845e17e-c85b-b3eb-52c9-bec40480878c/8da5acfd-281c-4b4a-839e-952ee7cf1c16_Simulator_Screen_Shot_-_iPhone_11_Pro_Max_-_2020-10-09_at_10.31.42.png/1242x2688.png)

## Four To Twenty Rating Breakdown in United States
- 5 stars: 8 (73%)
- 4 stars: 2 (18%)
- 3 stars: 0 (0%)
- 2 stars: 1 (9%)
- 1 stars: 0 (0%)

## Four To Twenty Reviews in United States

### ***** "Ideas"
It will be nice to be able to save/add your own custom units and add a slider on the results to vary the values quicker. A nice addition could also be a graph x-y. Thank you.
-- dnybanegas, 2026-09-16

### ***** "Very useful"
App is very useful but seems to be forgotten about as far new features being added. As another review stated a percentage would be super useful and to be able to rename the custom selection too.
-- Subscriptions suc, 2025-04-02

### ***** "Great App!"
This app is fantastic!
Wonder what your thoughts are on adding what the 0-100% value would be.
Ex: 0-100•c 16mA would be 75%. This example is very easy but say we’re looking for 42% of the range. Hope this makes sense.
-- farmer jacome, 2022-11-12

### ****- "Simple and easy"
I think it would be helpful if you added the math formula with it.
-- Premo69, 2020-12-28

[View all Four To Twenty reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews)


## Four To Twenty Store Rankings
| Chart | Country | Category | Rank |
|-------|---------|----------|------|
| Top Paid | Ireland | Utilities | #11 |
| Top Paid | Italy | Utilities | #32 |
| Top Paid | Ireland | Overall | #86 |
| Top Paid | Kazakhstan | Utilities | #148 |
| Top Paid | Thailand | Utilities | #181 |
| Top Paid | Germany | Utilities | #196 |
| Top Paid | Italy | Overall | #216 |
| Top Paid | Chile | Utilities | #237 |

## Four To Twenty Discovered Keywords
- converter calculator
- four to twenty
- ma/v converter

## Apps Similar to Four To Twenty
- [Unit of measurement converter](https://apptail.io/app/unit-of-measurement-converter-FKo/united-states)
- [One Converter: Unit Calculator](https://apptail.io/app/one-converter-unit-calculator-hNmb/united-states)
- [Smart Dial - T9 One Click Dial](https://apptail.io/app/smart-dial-t9-one-click-dial-HQrc/united-states)
- [Convertisseur de format GPS](https://apptail.io/app/convertisseur-de-format-gps-ZCKc/united-states)
- [Conduit Bender Elite - Calc](https://apptail.io/app/conduit-bender-elite-calc-ISed/united-states)
- [Interpolant](https://apptail.io/app/interpolant-mYod/united-states)
- [Lithium Blue Battery Monitor](https://apptail.io/app/lithium-blue-battery-monitor-qate/united-states)
- [dooplicator](https://apptail.io/app/dooplicator-Gkze/united-states)
- [PTDevices](https://apptail.io/app/ptdevices-yFcp/united-states)
- [Unit Converter & Currency](https://apptail.io/app/unit-converter-currency-NVYp/united-states)

## Four To Twenty Available In
- [United States](https://apptail.io/app/four-to-twenty-mav-converter-KSXi/united-states)
- [Canada](https://apptail.io/app/four-to-twenty-mav-converter-KSXi/canada)
- [Thailand](https://apptail.io/app/four-to-twenty-mav-converter-KSXi/thailand)
- [Ecuador](https://apptail.io/app/four-to-twenty-mav-converter-KSXi/ecuador)
- [Egypt](https://apptail.io/app/four-to-twenty-mav-converter-KSXi/egypt)
- [Kuwait](https://apptail.io/app/four-to-twenty-mav-converter-KSXi/kuwait)
- [Peru](https://apptail.io/app/four-to-twenty-mav-converter-KSXi/peru)
- [Pakistan](https://apptail.io/app/four-to-twenty-mav-converter-KSXi/pakistan)
- [Belarus](https://apptail.io/app/four-to-twenty-mav-converter-KSXi/belarus)
- [South Africa](https://apptail.io/app/four-to-twenty-mav-converter-KSXi/south-africa)
- [Dominican Republic](https://apptail.io/app/four-to-twenty-mav-converter-KSXi/dominican-republic)
- [Algeria](https://apptail.io/app/four-to-twenty-mav-converter-KSXi/algeria)

---

## About AppTail

[AppTail](https://apptail.io) is a mobile app intelligence platform providing app analytics, ASO (App Store Optimization) tools, keyword tracking, competitor analysis, revenue estimates, and review monitoring for iOS App Store apps. Track your app's performance, discover ranking keywords, monitor competitors, and analyze market trends.

- [Search Apps](https://apptail.io)
- [Top Charts](https://apptail.io/top-iphone-apps)
- [Sign Up for Full Access](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=footer)

*Data provided by [AppTail](https://apptail.io) - Mobile App Intelligence Platform*