# Lumen Calculator — Conv Lumens, Lux and Candelas

> Physics calculator for converting lumens, lux, and candelas with formulas. (iPhone/iPad app by Nitrio.)

- Source: https://appshunter.io/ios/app/lumen-calculator/id1412317888 (this page in markdown: same URL + `.md`)
- Developer: [Nitrio](https://appshunter.io/developer/321121189)
- Category: Utilities, Productivity
- Price: $2.99
- Age rating: 4+
- Requires: iOS 13 · 1 MB
- Languages: American English
- Released: 2018-08-01
- Data updated: 2026-08-22
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/lumen-calculator/id1412317888/reviews.md

## What is Lumen Calculator?

The Lumen Calculator is a physics/math calculator designed to swiftly and easily convert between lumens, lux, and candelas.

Features:
- Instant calculation.
- Results are copyable to other apps.
- Formulas included as references.
- Supports up to 16 decimal places.
- Supports various units for each input.
- Works seamlessly on both iPhone and iPad.
- Lightweight, compact app optimized for everyday use.
- Ad-free and built with privacy in mind.

Definitions:
- Lumens: Unit of luminous flux, representing the total amount of light emitted by a source.
- Lux: Measure of surface illumination, indicating how much light is received by a surface.
- Candelas: SI units of luminous intensity, representing light emitted from a source in a particular direction per steradian.

Note:
Candelas measure the light emitted in a specific direction, while lux measures the light received per unit area. One steradian, the area of the receiving surface, is equal to the squared distance between the source and the receiver.

Formulas:
1. Lumens = Candelas * Ω
   (For a specific angle)
2. Lumens = Candelas * 2π * [1 - cos(θ/2)]
3. Lux = Lumens / Area
4. Lux = Candela / Distance²

Where:
Ω = 2π * [1 - cos(θ/2)]
Ω = 4π

Thanks for your support, and please visit nitrio.com for more apps for your iOS devices.

## Key features

- Instant calculation
- Copyable results
- Reference formulas
- High precision (16 decimal places)
- Supports various units
- Ad-free and private

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/lumen-calculator/id1412317888/reviews.md

### 1/5 — Not for me

*2021-05-03*

This app does not do what I was led to believe it would produce. If this app is rated for age 4+, then I must be an idiot. Wish I could get my money back. Thank goodness it didn’t cost much!

## Frequently asked questions about Lumen Calculator

### What is Lumen Calculator used for?

Lumen Calculator is a physics and math tool designed for swift and easy conversion between lumens, lux, and candelas. It provides instant calculations with copyable results and includes reference formulas for your convenience.

### Does Lumen Calculator have ads?

No, Lumen Calculator is ad-free and built with privacy in mind. You can perform your calculations without any interruptions from advertisements.

### What devices does Lumen Calculator support?

Lumen Calculator works seamlessly on iPhone and iPad devices. It is optimized for everyday use across these platforms.

### How precise are the calculations in Lumen Calculator?

Lumen Calculator supports calculations up to 16 decimal places, ensuring high precision for all your lighting unit conversions. It also supports various units for each input.

### Can I copy the results from Lumen Calculator?

Yes, the results from Lumen Calculator are copyable. This allows you to easily transfer the calculated values to other applications for further use.

### What are lumens, lux, and candelas?

Lumens measure luminous flux (total light emitted), lux measures surface illumination (light received by a surface), and candelas measure luminous intensity (light emitted in a specific direction). Lumen Calculator helps you convert between these.

### How often is Lumen Calculator updated?

The latest version of Lumen Calculator is 1.3, last updated on January 30, 2026. You can expect ongoing support and potential updates from the developer, Nitrio.

### What is the price of Lumen Calculator?

Lumen Calculator is available for a one-time purchase of $2.99. This provides full access to all its features without any recurring fees or in-app purchases.

## Version history (last 4 releases)

### 1.3 — 2026-01-30

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

### 1.2 — 2024-01-24

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

### 1.1 — 2020-10-23

- Update for Newest Devices
- Bug Fixed

### 1.0 — 2018-07-24

No release notes.

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All apps by Nitrio: https://appshunter.io/developer/321121189

## Related topics

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

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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 2026-08-22.*