# RCircuitCalc

> Calculates standard resistance values for electrical circuit design. (iPhone/iPad app by TAKAHIKO FUKUYAMA.)

- Source: https://appshunter.io/ios/app/rcircuitcalc/id857468508 (this page in markdown: same URL + `.md`)
- Developer: [TAKAHIKO FUKUYAMA](https://appshunter.io/developer/857468511)
- Category: Productivity
- Price: $1.99
- Rating: 1.00/5 from 5 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.6 · 7 MB
- Languages: American English
- Released: 2014-04-20
- Data updated: 2026-06-08
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/rcircuitcalc/id857468508/reviews.md

## What is RCircuitCalc?

This application is intend for engineers and students who are wasting time for designing electric and electronic circuits.
The standard resistance values based on E-series numbers are outputted in inputting necessary conditions such as input voltage, output voltage, current and so on.

Features
The calculable circuits are as follows:
- Voltage Dividers (Inputting output voltage or resistance ratio)
- Series Circuits
- Parallel Circuits
- Combination Circuits

In the Voltage Dividers, resistance values are calculated in entering input voltage, output voltage or resistance ratio, and current into input boxes, besides, the most suitable resistance values are calculated in selecting priority whether Normal or Vout.

In the Series Circuits, Parallel Circuits and Combination Circuits, divided resistance values are calculated in entering a combined resistance value into an input box.

Calculated resistance values are displayed with the following E-series number specified either.
E6, E12, E24, E48, E96

This application is able to calculate current and power of each resistor on calculated resistance values.

Attention
Because standard resistors are used and precision of calculation is ensured, the following restrictions are set up.
- Range of resistance value: 1Ω ~ 10MΩ
- Range of resistance ratio: 0.1 ~ 10

## Key features

- Calculates standard resistance values
- Supports voltage dividers, series, parallel, and combination circuits
- Calculates current and power for resistors
- Outputs resistance values based on E-series numbers (E6, E12, E24, E48, E96)
- Calculations based on input voltage, output voltage, current, and resistance ratio

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/rcircuitcalc/id857468508/reviews.md

### 1/5 — Useless

*2022-12-15, version 2.2.0*

App won’t let you input any values. Useless

### 1/5 — WASTE OF MONEY!!!

*2021-03-17, version 2.2.0*

i tried using the app and when i tried to enter my numbers nothing is showing up!! i am disappointed!!!

## Frequently asked questions about RCircuitCalc

### What circuit types can RCircuitCalc calculate?

RCircuitCalc can calculate voltage dividers, series circuits, parallel circuits, and combination circuits. For voltage dividers, it can calculate resistance values based on input voltage, output voltage, or resistance ratio, and current. For other circuit types, it calculates divided resistance values based on a combined resistance value.

### What E-series numbers does RCircuitCalc use for resistance values?

RCircuitCalc displays calculated resistance values using the following E-series numbers: E6, E12, E24, E48, and E96. This ensures that the calculated values correspond to standard resistor values.

### What are the range restrictions for resistance values and ratios in RCircuitCalc?

RCircuitCalc has specific range restrictions for calculations. The range of resistance values is from 1Ω to 10MΩ, and the range of resistance ratios is from 0.1 to 10. These restrictions ensure precision and the use of standard components.

### Can RCircuitCalc calculate current and power for resistors?

Yes, RCircuitCalc is able to calculate the current and power of each resistor based on the calculated resistance values. This provides additional useful information for circuit analysis.

### What devices does RCircuitCalc support?

RCircuitCalc is supported on iPhone, iPad, and iPod. It is designed for Apple mobile devices.

### How often is RCircuitCalc updated?

The latest version of RCircuitCalc is 2.3.0, which was last updated on October 11, 2023. This indicates a relatively infrequent but consistent update schedule.

### What is the age rating for RCircuitCalc?

RCircuitCalc has an age rating of 4+. This means it is considered suitable for users aged 4 and above.

### What is the price of RCircuitCalc?

RCircuitCalc is a paid application priced at $1.99. There are no in-app purchases or advertisements associated with this application.

## Version history (last 5 releases)

### 2.3.0 — 2023-10-11

Support for all screen sizes of iPhone/iPad/iPod touch.
Fix an issue that text fields, labels and clear buttons are not displayed correctly because of operating system updates.

### 2.2.0 — 2020-06-12

Support for all screen sizes of iPhone/iPod touch.
Add support for iPad and adjust the UI size to the number of pixel.
Change selection name of priority calculation to Simple/Precision in Voltage Divider.
Improve the calculation accuracy for all circuits, however, E192 calculation which requires a long calculation time is removed from this function.

### 2.1.0 — 2017-03-31

Support for the calculation of combination circuits.
Improve the calculation accuracy for series and parallel circuits.
Change to new design for power of each resistor.

### 2.0.1 — 2015-09-30

Fix a issue that the text of menu screen is not displayed properly on iOS 9.

### 2.0.0 — 2015-07-30

Support for iPhone6 and iPhone 6 Plus.
Support for calculation up to 4 resistors.
Change to new user interface design.
Change priority name from Current/Voltage to Normal/Vout in the Voltage Divider pages.

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## More apps by TAKAHIKO FUKUYAMA

- [BasicATTCalc](https://appshunter.io/ios/app/basicattcalc/id947238679)
- [CCircuitCalc](https://appshunter.io/ios/app/ccircuitcalc/id1435462075)

All apps by TAKAHIKO FUKUYAMA: https://appshunter.io/developer/857468511

## Related topics

[From the combination of resistors with resistance values R1 = R2 = R3 = 5 Ω and R4 = 10 Ω, which of the following combination is the best circuit to get an equivalent resistance of 6Ω ?](https://appshunter.io/ios/topics/from-the-combination-of-resistors-with-resistance-values-r1-r2-r3-5-and-r4-10-which-of-the-following-combination-is-the-best-circuit-to-get-an-equivalent-resistance-of-6)

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*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 2026-06-08.*