Best Model Scale Calculator Apps

249+ iOS apps curated and reviewed

3.7 avg rating

18 free apps

Updated October 2026

Out of 249+ model scale calculator apps on iOS, 18 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.

Compare top Model Scale Calculator Apps (October 2026)

#	App	Price	Rating	Ads	In-App Purchases	Updated
1	Model Scale Calculator	Free	—	No	No	Oct 2026
2	Model Scaler	Free	2.9★ (12)	No	No	May 2026
3	Scale Ratio	Free	3.7★ (3)	No	Yes	Aug 2026
4	Scale Calculator Easy	Free	—	No	No	May 2026
5	iScaleModel	Free	2.0★ (2)	Yes	No	May 2026
6	Scale-o-Tron	$2.99	5.0★ (4)	No	No	May 2026
7	Calculator . - AI Math Solver	Free	—	No	Yes	Oct 2026
8	Calculatir - Calculator	Free	—	No	Yes	Jun 2026

Top Picks for Model Scale Calculator

#1

Model Scale Calculator by Harbor Apps LLC

HO, N, O, 1:35, 28mm & more

Editor's Choice

0.0(0 ratings)

Free

Model Scale Calculator screenshot 1

Model Scale Calculator screenshot 2

Model Scale Calculator screenshot 3

Model Scale Calculator screenshot 4

Model Scale Calculator screenshot 5

Model Scale Calculator screenshot 6

#2

Model Scaler by Woodland Scenics

Strong Contender

📊 Productivity

2.9(12 ratings)

Free

Model Scaler screenshot 1

This tool instantly converts measurements between U.S. Customary and Metric units for any modeling scale. It's designed to be fast, easy, and efficient for all types of scale modelers.

#3

Scale Ratio by Adrien Brecheteau

For Architect, Modelist

Worth Considering

3.7(3 ratings)

FreeIn-App Purchases

Scale Ratio screenshot 1

Scale Ratio screenshot 2

Scale Ratio screenshot 3

Easily convert distances between any scales for projects like architecture and model building. Input your measurements and desired scale to instantly calculate scaled distances.

More Model Scale Calculator apps to explore

Scale Calculator Easy

Scale Calculator Easy

Scale Calculator Easy

by YAVUZ BULAMADIK

For quick calculation of scale

Easily convert measurements between metric and imperial units for scale models. Adjust ratios with a slider to see scaled-up or scaled-down comparisons.

Metric and Imperial unit conversionScale up or down functionalityAdjustable ratio slider

Scale and Unit Calculator

This tool simplifies scaling and unit conversions for creators. It offers a vast library of scales and units, allowing for seamless adjustments and precise calculations. Customize the interface to match your workflow and focus on your projects.

Extensive database of scales and unitsCustomizable scales and unitsImperial and metric conversions

📊 Productivity

Calculator . - AI Math Solver

Calculator . - AI Math Solver

Calculator . - AI Math Solver

Basic, Scientific, Plus Calc

Calculatir - Calculator

Calculatir - Calculator

Calculatir - Calculator

Basic, Scientific, Plus Calc

Rail Model Calc

Rail Model Calc

Rail Model Calc

For building railroad models

Basic, Scientific, Plus Calc

Calculator - CalcSphere

Calculator - CalcSphere

Calculator - CalcSphere

Calculator & Converter

Kitbasher Scale Model App

Kitbasher Scale Model App

Kitbasher Scale Model App

Your Scale Model Workshop

🎬 Entertainment

Basic & Scientific Calculator

Calculator for iPad!

Calculator for iPad!

Calculator for iPad!

Basic & Scientific Calculator

This app offers both basic and scientific calculation modes with over 30 scientific operations. It allows for customization of the app's appearance and includes features for note-taking, drawing, and viewing calculation history. It supports high accuracy calculations and nested parentheses.

Basic and scientific calculator modesOver 30 scientific operationsCustomizable appearance (iPad)

Calculator - Number Block

Calculator - Number Block

Calculator - Number Block

My own calculator

Scale Ruler - Pocket Ruler

Scale Ruler - Pocket Ruler

Scale Ruler - Pocket Ruler

Triangular Scale & Ruler

ArchitectScaler

ArchitectScaler

ArchitectScaler

Pocket scale ruler, reimagined

by Manfred Breede

Instrument Scaling Calculator

Instrument Scaling Calculator

Instrument Scaling Calculator

Instrument Scaling Calculator

This tool simplifies instrumentation setup and scaling needs. It performs accurate conversions between process variables, 4-20mA signals, and percentages with an intuitive interface for quick calculations.

Converts between 4-20mA, process variables, and percentagesUser-friendly interfaceProvides instant calculation results

📊 Productivity

Projector & Screen Calculator

Projector & Screen Calculator

Projector & Screen Calculator

by Julien Blais-Savoie

This utility app helps video technicians and projectionists quickly calculate essential projection parameters. It supports various aspect ratios and measurement systems, providing pixel density and lumen output information.

Calculate lens throw ratioCalculate screen sizeCalculate distance

FAQ about Model Scale Calculator

Are there free model scale calculator apps for iPhone?

Yes — 18 of the top model scale calculator apps we rank are free to download, including Model Scale Calculator and Model Scaler.

Does Model Scale Calculator have ads or in-app purchases?

Model Scale Calculator has no ads and has no in-app purchases, according to its App Store listing as of October 2026.

How many model scale calculator apps are on the App Store?

We track 249+ model scale calculator apps on the iOS App Store as of October 2026, ranked by rating, recency, and analysis of real user reviews.