# Capacitor Calculator — Charge and Time Constant

> Calculates capacitor time constant and stored energy for electrical circuits. (iPhone/iPad app by Tan Chia Ling.)

- Source: https://appshunter.io/ios/app/capacitor-calculator/id1366563133 (this page in markdown: same URL + `.md`)
- Developer: [Tan Chia Ling](https://appshunter.io/developer/321121189)
- Category: Utilities, Productivity
- Price: $2.99
- Rating: 3.75/5 from 4 App Store ratings
- Age rating: 4+
- Requires: iOS 17.6 · 1 MB
- Languages: English, French, German, Japanese, Korean, Portuguese, Chinese, Spanish, Chinese
- Released: 2018-04-02
- Data updated: 2026-07-04
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/capacitor-calculator/id1366563133/reviews.md

## What is Capacitor Calculator?

Capacitor Calculator is an all-in-one toolkit for students, hobbyists, technicians, and electrical engineers who work with capacitors every day. Whether you are designing an RC circuit, sizing a power supply, building a flash circuit, or studying electromagnetism for an exam, this app gives you fast and accurate answers together with the formulas and calculation steps behind every result.

THREE CALCULATORS IN ONE APP
1. Capacitor Charge and Time Constant
   Enter supply voltage (V), capacitance (C), and series resistance (R) to instantly calculate:
• Stored energy: E = 0.5 * C * V^2
• RC time constant: T = R * C
• Charge stored: Q = C * V

2. Parallel Plate Capacitance
   Compute capacitance using plate area, separation distance, and relative permittivity with:
   C = e0 * er * A / d

Perfect for understanding how geometry and dielectric materials affect capacitance.

3. Spherical Capacitor
   Calculate capacitance between two concentric conducting spheres using:
   C = 4 * pi * e0 * er * R1 * R2 / (R2 - R1)

Choose from built-in dielectric materials including vacuum, air, paper, glass, mica, ceramic, polyethylene, polystyrene, Teflon, silicon, and water.

BUILT FOR REAL WORK
• Unit-aware inputs for voltage, capacitance, resistance, length, and area
• Scientific notation for very small or very large values
• Full calculation steps with formulas and substituted values
• Copy results with one tap
• Save and review calculation history
• Everything runs on-device with no tracking, no account, and no internet required

A POLISHED NATIVE IOS EXPERIENCE
• Full Light Mode and Dark Mode support
• Reference tab with physical constants, formulas, and dielectric materials table

Capacitor Calculator is a focused tool for electrical engineering, electronics design, physics homework, and EE coursework.

Download it once and keep professional-grade capacitor calculations in your pocket.

Thanks for your support, and visit nitrio.com for more apps for your iPhone and iPad.

## Key features

- Calculate time constant (RC)
- Calculate energy stored (E)
- Input voltage, capacitance, and resistance
- Understand capacitor charging/discharging
- Analyze circuit time-delay


## Frequently asked questions about Capacitor Calculator

### What is the time constant calculated by Capacitor Calculator?

The time constant is a measurement of the time needed to charge a capacitor by approximately 63.2% or discharge it by about 36.8%. Capacitor Calculator computes this value using capacitance and load resistance.

### How does Capacitor Calculator determine the energy stored in a capacitor?

Capacitor Calculator can determine the energy stored on a capacitor by providing all three input values: voltage (V), capacitance (C), and load resistance (R).

### What electrical concepts does Capacitor Calculator help explain?

The app helps explain the time-delay characteristics of electrical circuits when a signal or voltage is applied, and how capacitors store and release electrical energy.

### What devices is Capacitor Calculator compatible with?

Capacitor Calculator is available for iPhone, iPad, and iPod devices.

### What is the age rating for Capacitor Calculator?

Capacitor Calculator has an age rating of 4+, making it suitable for a wide range of users.

### How often is Capacitor Calculator updated?

The latest version of Capacitor Calculator is 1.3, and it was last updated on March 6, 2026. This indicates a commitment to ongoing development and improvements.

### What is the price of Capacitor Calculator?

Capacitor Calculator is available for a one-time purchase of $2.99.

### Does Capacitor Calculator have ads?

No, Capacitor Calculator does not contain advertisements, offering an uninterrupted user experience.

## Version history (last 5 releases)

### 1.5 — 2026-06-24

- Optimized for the latest devices.
- Fixed minor bugs.
- Improved and redesigned the UI.

### 1.3 — 2026-03-06

- Updated for the newest devices.
- Minor bugs fixed.

### 1.2 — 2024-01-13

- Updated for the newest devices.
- Minor UI update.
- Minor bugs fixed.

### 1.1 — 2020-11-26

- Update for Newest Devices
- Bug Fixed

### 1.0 — 2018-04-02

No release notes.

## Apps similar to Capacitor Calculator

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Flange Hole Marker Pro](https://appshunter.io/ios/app/flange-hole-marker-pro/id1486290745) | 1.0 (1) | $2.99 | Utilities |
| [RC Circuit Pro](https://appshunter.io/ios/app/rc-circuit-pro/id824145786) | 1.0 (1) | $0.99 | Utilities |
| [Metric Converters](https://appshunter.io/ios/app/metric-converters/id1570182170) | — | Free | Utilities |
| [Vector Calculator Plus](https://appshunter.io/ios/app/vector-calculator-plus/id1630864948) | 4.0 (1) | $2.99 | Utilities |
| [Electronic Circuits Calc Pro](https://appshunter.io/ios/app/electronic-circuits-calc-pro/id1658493129) | — | $4.99 | Utilities |
| [Geomulator](https://appshunter.io/ios/app/geomulator/id894916514) | 1.0 (1) | $1.99 | Utilities |

## More apps by Tan Chia Ling

- [Coloring Book - Plus](https://appshunter.io/ios/app/coloring-book-plus/id500418548)
- [Resistor Plus](https://appshunter.io/ios/app/resistor-plus/id500615686)
- [Premium Clock Plus](https://appshunter.io/ios/app/premium-clock-plus/id502784721)
- [Gold Luxury Clock](https://appshunter.io/ios/app/gold-luxury-clock/id505043266)
- [Ohm Law Calculator](https://appshunter.io/ios/app/ohm-law-calculator/id505900137)
- [Premium Clock](https://appshunter.io/ios/app/premium-clock/id517487778)

All apps by Tan Chia Ling: https://appshunter.io/developer/321121189

## Related topics

[capacitorcalc](https://appshunter.io/ios/topics/capacitorcalc)

---

*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 2026-07-04.*