# CALC ToolBox — Unit Converter/Calculator

> Unit Converter/Calculator (iPhone/iPad app by 1BIGRIG Ltd.)

- Source: https://appshunter.io/ios/app/calc-toolbox/id6741718195 (this page in markdown: same URL + `.md`)
- Developer: [1BIGRIG Ltd](https://appshunter.io/developer/1792073283)
- Category: Productivity, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.6 · 5 MB
- Languages: American English
- Released: 2025-02-10
- Data updated: 2026-08-22
- User reviews in markdown: https://appshunter.io/ios/app/calc-toolbox/id6741718195/reviews.md

## What is CALC ToolBox?

The CALC ToolBox – The Ultimate Precision Calculation & Conversion Suite for AV professionals.

Whether you're an engineer, technician, or industry professional who values accuracy, CALC ToolBox is designed to streamline your workflow with powerful, easy-to-use tools.

Key Features:

dBm to Watts & dBµV to dBm Conversions – Instantly convert signal levels and power values for audio, RF, and electronics projects.

Voltage Drop Calculator – Ensure optimal circuit performance by quickly computing voltage drops.

Measurement Converter – Seamlessly switch between units: feet to meters, pounds to kilograms, and more.

Temperature Converter with Humidity Calculation – Convert temperatures and humidity for comprehensive environmental analysis.

Ohm’s Law Calculator – Solve electrical circuits instantly with our intuitive Ohm’s Law tool.

DMX DIP Switch Calculator – Easily determine DIP switch settings for DMX-controlled lighting systems.

90/180 Schengen Area Calculator – Track your travel days and stay compliant with Schengen visa rules.

Projection Throw Distance Calculator – Get the perfect projector placement for any screen size and setup.

Audio Delay Calculator - Calculate sound delay by distance, temperature, humidity, and digital latency instantly.

Subnet - Calculate IP ranges, subnet masks, and usable hosts with a fast, intuitive CIDR tool.

With its intuitive interface and robust feature set, CALC ToolBox helps you work faster, smarter, and with unmatched precision.

Download now and take your calculations to the next level!

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $4.99 | one-time |



## Version history (last 5 releases)

### 3.0.2 — 2026-02-02

Small updates and improvements

### 3.0.1 — 2025-12-13

Hot fix for Version 3... NEW UI with improved layouts.
More calculators coming 2026

### 3.0 — 2025-12-12

Version 3 is here! NEW UI with improved layouts.
More calculators coming 2026

### 2.0 — 2025-06-05

Hello to Version 2.0

Lots of improvements and updates throughout the app. 

Two new features added:
Audio Delay Calculator 
Subnet Address Calculator. 

Please keep sending us your ideas, issues and any other comments.

### 1.2.5 — 2025-02-23

Big fixes and overall improvements.

## Apps similar to CALC ToolBox

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Self Employed: Mileage & Tax](https://appshunter.io/ios/app/self-employed-mileage-and-tax/id6747913130) | — | Free | Productivity |
| [MobileEOM](https://appshunter.io/ios/app/mobileeom/id1466201917) | 5.0 (1) | Free | Productivity |
| [ARRI Rental ARTS](https://appshunter.io/ios/app/arri-rental-arts/id6450663939) | — | Free | Productivity |
| [dmx calculator](https://appshunter.io/ios/app/dmx-calculator/id1203563746) | 4.2 (5) | Free | Productivity |
| [Simple Quick Notepad](https://appshunter.io/ios/app/simple-quick-notepad/id6458223059) | — | Free | Productivity |
| [Delphos Mobile Client](https://appshunter.io/ios/app/delphos-mobile-client/id988845528) | — | Free | Productivity |

## More apps by 1BIGRIG Ltd

- [SE ToolBox](https://appshunter.io/ios/app/se-toolbox/id6741111166)
- [TECH ToolBox](https://appshunter.io/ios/app/tech-toolbox/id6741366999)
- [BLT ToolBox](https://appshunter.io/ios/app/blt-toolbox/id6741779517)
- [LX ToolBox](https://appshunter.io/ios/app/lx-toolbox/id6742348161)
- [The Ohms Law Calc](https://appshunter.io/ios/app/the-ohms-law-calc/id6747296194)

All apps by 1BIGRIG Ltd: https://appshunter.io/developer/1792073283

## Related topics

[tremec toolbox](https://appshunter.io/ios/topics/tremec-toolbox)

---

*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.*