# How to create an open world landscape in Km²

**URL:** <https://forums.unrealengine.com/t/how-to-create-an-open-world-landscape-in-km/2304466>\
**Category:** Getting Started & Setup\
**Tags:** size, Open-World, unreal-engine, Landscape, editor, question\
**Created:** [January 26, 2025, 5:33pm UTC](https://forums.unrealengine.com/t/how-to-create-an-open-world-landscape-in-km/2304466 "2025-01-26T17:33:04Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![BELUGAS-DE](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@BELUGAS-DE](https://forums.unrealengine.com/u/BELUGAS-DE)\
**Post date:** [January 26, 2025, 5:33pm UTC](https://forums.unrealengine.com/t/how-to-create-an-open-world-landscape-in-km/2304466/1 "2025-01-26T17:33:04Z")

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Hello

I am fairly new to using UE5

I want to create a 70km² landscape / map for my open world game. Now I don’t even know how big the standard sizes in km² are that UE suggests.

For example  
**Scale:** 100x100x100  
**Section size:** 64x64  
**Section Per component:** 2x2  
**Number of Components:** 32x32  
**Overall Resolution:** 4033x4033  
**Total Components:** 1.024

Source:

> **[Landscape Technical Guide in Unreal Engine | Unreal Engine 5.5 Documentation...](https://dev.epicgames.com/documentation/en-us/unreal-engine/landscape-technical-guide-in-unreal-engine)**
>
> Understanding the construction and dimensions of Landscape Outdoor Terrain.

Can someone tell me how I can calculate this or what I have to enter to get 70km²?

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**Author:** ![BRGEzeHulton](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@BRGEzeHulton](https://forums.unrealengine.com/u/BRGEzeHulton)\
**Post date:** [February 25, 2025, 2:20pm UTC](https://forums.unrealengine.com/t/how-to-create-an-open-world-landscape-in-km/2304466/2 "2025-02-25T14:20:59Z")

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Hello Belugas-DE, let me help you with this.

I performed some calculations and believe these are correct.

 ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/1/4/f/14f051bb4b442812efe8e962e6ea4990c2a41144.png)

Im use this page to calculate(and UE doc)

> **[A way to Calculate the default Sizes of Unreal Engine Landscapes - Motion...](https://www.motionforgepictures.com/calculate-unreal-engine-landscape-sizes/?utm_source)**
>
> The real world equivalent sizes of the default landscapes in Unreal Engine

Steps:  
We know that 70 km² is roughly a square of 8.4 km x 8.4 km (because √70 ≈ 8.4).  
Convert km to meters:  
8.4 km = 8400 meters

Unreal Engine landscapes are built using heightmap resolutions that follow specific sizes.

In the calculator, look for an option with a real-world size close to 8400m.  
The closest match is 8129 x 8129 pixels, covering 8129m x 8129m.

Result:  
If you choose 8129 x 8129, the real-world size will be ~8.1 km x 8.1 km, which is very close to the 8.4 km x 8.4 km target.

Since 8129 meters is slightly smaller than 8400 meters, you need to scale up the landscape in Unreal Engine.

1. Use this formula to calculate the scale:

Scale=( Actual Heightmap Size / Desired Size in Meters)×100

Scale=( 8129 / 8400)×100≈103.3

In Unreal Engine, when creating the landscape, set the scale to:

X: 103.3

Y: 103.3

Z: 100 (Z depends on the terrain height; adjust as needed)