# Diversity Calculator — Maximum demand and diversity

> Maximum demand and diversity (iPhone/iPad app by Pro Certs Software Ltd.)

- Source: https://appshunter.io/ios/app/diversity-calculator/id1563626444 (this page in markdown: same URL + `.md`)
- Developer: [Pro Certs Software Ltd](https://appshunter.io/developer/444429696)
- Category: Productivity, Utilities
- Price: $9.99
- Age rating: 4+
- Requires: iOS 11.0 · 2 MB
- Languages: American English
- Released: 2021-04-19
- Data updated: 2026-08-24
- User reviews in markdown: https://appshunter.io/ios/app/diversity-calculator/id1563626444/reviews.md

## What is Diversity Calculator?

Calculate the maximum demand, total full load and apply diversity. 

Enter your load values in Amps, Watts or kW, for three phase also select the phase for which the load applies to: L1, L2, L3 or L123.

Calculation Reults:
- Total Full Load
- DL 1 (osg)= Calculates diversity based on the OSG.
- DL 1 (custom) = Set your own diversity factor.
- DL 2 = Applies the rule of thumb method.
- DL 3 = Apply a usage factor to DL 1 (OSG).

Other Features:
- Custom Circuit: You can enter your own diversity factor and circuit description for "custom circuits".
- Edit the default PF (power factor) value for applicable three phase circuits.
- Print all results.

How to calculate single phase diversity:
1) Select the distribution board type  (Single Phase, Three Phase).
2) Select the type of premises.
3) Select the description of circuit / load.
4) Enter the load value (kW, Watts, Amps).
5) Add Load
 
How to calculate three phase diversity:
1) As above but with the additional options to select phase, L1, L2 L3 or L123.

A single phase (230v) and three phase (400v) diversity calculator.

When adding multiple loads of the same type i.e. Cookers, socket-outlets etc. always enter the biggest load first, then the second largest load and then finally the remainder of the loads.

This diversity calculator ( = DL 1 (osg) ) is based on the 18th edition On-Site Guide. The diversity calculations results with 3 results based on 3 different methods on applying and calculating diversity.


## Version history (last 5 releases)

### 1.0.8 — 2025-08-12

10/08/2025 v1.0.8
- UI optimisations
- PDF file layout improvements

### 1.0.5 — 2022-07-30

Dark mode bug fix.

### 1.0.4 — 2022-01-23

News feed update.

### 1.0.2 — 2021-10-06

- You can now edit the PF (power factor) value for relevant three phase circuits.
- You can now add a "custom circuit" to all types of premises.
- Custom circuits: You can now enter your own diversity factor and circuit description.
- Improved help guide.
- Improved default circuit descriptions.

### 1.0.0 — 2021-04-19

No release notes.

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All apps by Pro Certs Software Ltd: https://appshunter.io/developer/444429696

## Related topics

[diversity calculator](https://appshunter.io/ios/topics/diversity-calculator)

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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 2026-08-24.*