How to Calculate Projection Distance, Screen Size & Choose the Right Magcubic Model
When choosing a projector, one of the most important — yet often overlooked — specs is the throw ratio.
It directly determines:
· How far you need to place the projector
· How large your screen can be
· Whether it fits your room setup
This guide will walk you through everything step by step — from formulas to real examples and product comparisons.
What Is Throw Ratio?
The definition is simple:Throw Ratio = Projection Distance ÷ Screen Width
From this, you can derive the most useful formula:Projection Distance = Throw Ratio × Screen Width
This is the key calculation used in real-world setups.
How to Calculate Screen Width (16:9 Example)
Most home projectors use a 16:9 aspect ratio.
If you only know the screen size (in inches), that refers to the diagonal, so you need to convert it to width.
Formula:Screen Width = Screen Size × 0.872
(This is a fixed conversion factor for 16:9 screens.)
Real Calculation Example
Assume:
· Throw Ratio = 1.5
· Screen Size = 100 inches
· Aspect Ratio = 16:9
Step 1: Calculate Width
100 × 0.872 ≈ 87.2 inches
Step 2: Calculate Distance
1.5 × 87.2 ≈ 130.8 inches
≈ 3.32 meters
Conclusion:
A projector with a 1.5 throw ratio needs about 3.3 meters to project a 100-inch screen.
Reverse Calculation
If you already know your room setup:
· Projection Distance = 3 meters
· Screen Width = 2 meters
Throw Ratio = 3 ÷ 2 = 1.5
This method is ideal if:
✔ Your room is already set up
✔ You want to check if a projector will fit your space
Magcubic Projector Throw Ratio Comparison
Here’s a clear overview of different Magcubic models:
|
Model |
Throw Ratio |
Screen Size |
Distance (inch) |
Distance (cm) |
|
HY450 |
0.6 |
200" |
104.64 |
265.79 |
|
HY320 Mini |
0.9 |
100" |
78.48 |
199.34 |
|
HY300 Pro |
0.9 |
100" |
78.48 |
199.34 |
|
HY350 Pro |
1.37 |
100" |
119.46 |
303.44 |
|
L018 |
1.2 |
100" |
104.64 |
265.79 |
What Different Throw Ratios Mean
You can think of it like this:
0.6 (Ultra Short Throw)
· Very large image at a very short distance
· Ideal for small rooms or living rooms
· Example: HY450
0.9 – 1.1 (Short Throw)
· Best balance for most homes
· Flexible placement
· Examples: HY320, HY300 Pro
1.2 – 1.37 (Standard Throw)
· Requires more distance
· Better for bedrooms or dedicated setups
· Examples: L018, HY350
Use an Online Calculator (Recommended)
If you don’t want to calculate manually, use this tool,It helps you:
✔ Calculate distance from throw ratio
✔ Estimate screen size from distance
✔ Compare different projector setups quickly
How to Choose the Right Throw Ratio
A simple rule of thumb:
Small rooms (~2m distance) → Choose 0.6 – 0.9
Medium rooms (2–3m) → Choose 0.9 – 1.2
Large spaces (3m+) → Choose 1.2+
Common Mistakes to Avoid
❌ Only looking at “max screen size”
Without distance, this number is meaningless
❌ Ignoring wall width
The image might not fit even if distance does
❌ Assuming throw ratio tells the whole story
Actual performance also depends on:
· Lens design
· Digital zoom
· Installation position
Final Thoughts
Throw ratio comes down to one simple idea:
It determines how far you need to be to get the screen size you want.If you remember just three things:
✔ Use 0.872 to convert inches to width
✔ Use Throw Ratio × Width = Distance
✔ Use a calculator to save time
—you’ll avoid most common setup mistakes.
