HO scale at a glance
A versatile 1:87 miniature scale for buildings, vehicles, people, landscapes, model railroads, and complete miniature worlds.
Building a railroad, diorama, vehicle collection, or street scene starts with one decision: how can I use a consistent scale so every element looks like it belongs together.
What Is HO Scale (1:87)?
HO scale is a miniature modeling scale in which an object is approximately 87 times smaller than its real-life counterpart. It's commonly described as 1:87 scale.
87 in
real life for every 1 inch of model
3.5 mm
equals 1 real-world foot
21 mm
tall for a 6-foot person
2.07 in
long for a 15-foot vehicle
The letters HO originally meant Half O, referring to a scale developed at roughly half the size of O scale.
HO became widely adopted in model railroading, but the same miniature proportions work for many other hobbies. Buildings, vehicles, figures, street details, and landscaping products sold for HO scale can also be useful for non-railroad miniature projects.
How Big Is HO Scale in Inches and Millimeters?
One of the easiest ways to understand HO scale is to compare familiar real-world objects with their miniature equivalents.
| Real-world object |
Approximate HO size |
| 6-foot-tall adult |
0.83 in / 21 mm |
| 8-foot doorway |
1.10 in / 28 mm |
| 15-foot vehicle |
2.07 in / 53 mm |
| 20-foot shipping container |
2.76 in / 70 mm |
| 40-foot shipping container |
5.52 in / 140 mm |
| 50-foot building frontage |
6.90 in / 175 mm |
| 100-foot building |
13.79 in / 350 mm |
Measurements are approximate and based on 1:87 scale. Actual products can vary in size depending on their real-world prototype and manufacturer.
How to Calculate 1:87 Scale
To convert a real-world measurement into HO scale, divide the actual measurement by 87, using the same units.
Example: a 30-foot building
30 feet × 12 =
360 inches360 ÷ 87 =
about 4.14 inchesResult: about 4.1 inches wide in HO
You can use this calculation when planning buildings, parking lots, streets, industrial scenes, and custom miniature projects.
★ Quick reference
One real-world foot is approximately 3.5 millimeters in HO scale. Keep that number handy for quick estimates.
HO Scale vs. N Scale, O Scale, and Other Miniature Scales
Miniatures come in many different sizes, and choosing the correct scale is important when combining buildings, vehicles, and figures. The bars below show relative model size.
N scale 1:160Smaller than HO
HO scale 1:87Medium-sized
OO scale 1:76Slightly larger than HO
S scale 1:64Larger than HO
O scale 1:48Much larger than HO
Dollhouse scale (1:12) is far larger still, about seven times the size of HO.
Is HO Scale Only for Model Trains?
Not at all. HO scale is also useful for dioramas, miniature architecture, historical displays, vehicle collections, photography scenes, and detailed miniature worlds.
Because HO scale is so widely used in model railroading, hobbyists can find a broad selection of miniature accessories that work just as well without a single train track:
- Miniature buildings, storefronts, houses, warehouses, and factories
- 1:87 scale cars, trucks, buses, and construction vehicles
- Miniature people, animals, and street accessories
- Trees, shrubs, ground cover, rocks, and landscaping materials
- Roadways, fences, signs, utility poles, and industrial details
- Tools, paints, adhesives, and weathering supplies
For a diorama builder, these products provide the pieces needed to create a believable scene. For a miniature artist, they offer a starting point for a detailed world in a compact space.
Five Creative Ways to Use HO Scale Miniatures
1
Build a Small-Town Main Street
Brick storefronts, a corner café, parked cars, pedestrians, streetlights, and weathered sidewalks. Start with a few buildings, then add details that set the time period.
Useful supplies: buildings, 1:87 vehicles, figures, sidewalks, signs, street details
2
Create an Industrial Diorama
Factories, warehouses, loading docks, storage tanks, containers, and heavy equipment for a distribution center, manufacturing district, or construction site.
Useful supplies: industrial buildings, trucks, containers, steel and pipe loads, figures, weathering
3
Recreate an Abandoned Place
An abandoned factory, weathered barn, or overgrown service station. Faded signs, rust, broken pavement, and weeds add story without a big footprint.
Useful supplies: weathering products, older-style buildings, ground cover, foliage, debris
4
Build a Historical Scene
Recreate a 1950s downtown, a rural farming community, or an industrial worksite with period-correct buildings, vehicles, and details.
Useful supplies: era-specific vehicles, figures, structures, scenery
5
Make a Compact Display
Build around one focal point, such as a storefront, vehicle, or group of figures. Great for photography, collectibles, or a first project.
Useful supplies: one building or vehicle, a few figures, minimal scenery
Want a step-by-step walk through? Read our guide: How to Build a Miniature World.
How to Choose HO Scale Buildings, Vehicles, and Figures
Start by checking the scale label. Products marked HO, H0, or 1:87 are generally appropriate for HO scale scenes. But scale is only one part of choosing compatible miniatures.
Match the era
A modern delivery truck can look out of place in a 1930s street scene. Decide on a period before choosing vehicles and buildings.
Check actual dimensions
Two HO buildings can have very different footprints. Measure your space and review product dimensions, especially for large structures.
Look beyond the category
A product made for model railroads may be exactly what a miniature artist needs: vehicles, trees, figures, and street details.
Watch proportions
Some figures and accessories use simplified or exaggerated proportions. Compare brands before mixing them in a foreground scene.
Know the assembly level
Some buildings arrive ready to display; others are kits needing assembly and painting. Read the description before you buy.
Where to Buy HO Scale and 1:87 Miniature Supplies
At Trackside Trains, we carry model railroad products and accessories that can also be used to create miniature scenes and dioramas. Whether you're building a railroad layout, an industrial district, a small-town street, or a standalone display, many of the same buildings, vehicles, scenery materials, and details can bring your project to life.
Houses, businesses, industrial buildings, and other structures.
Cars, trucks, trailers, and commercial vehicles.
People, animals, and signage to bring a scene to life.
Street, industrial, and scenic details.
Modeling supplies, adhesives, and tools.
Frequently Asked Questions About HO Scale
What does HO scale mean?
HO stands for Half O. HO scale represents real objects at approximately 1:87 their actual size.
How tall is a person in HO scale?
A 6-foot-tall person would be approximately 21 millimeters, or 0.83 inches, tall. Figures vary depending on their intended height, pose, and manufacturer.
Is 1:87 scale the same as HO scale?
Yes, for most practical modeling and shopping purposes. HO scale is commonly referred to as 1:87.
Is HO scale bigger than N scale?
Yes. HO is approximately 1:87, while North American N scale is 1:160.
Can HO scale buildings be used for dioramas?
Absolutely. HO buildings work in architectural displays, historical scenes, miniature towns, industrial dioramas, and other projects without any trains.
Can I use 1:87 cars with HO scale buildings?
Yes. Vehicles labeled 1:87 are generally compatible with HO buildings, figures, and scenery. Check the model's era and actual dimensions for the most realistic results.
Is HO scale good for beginners?
HO is a practical choice for many beginners because of its broad selection of buildings, vehicles, figures, and scenery, and its balance between visible detail and manageable space.
Can HO scale miniatures be used in a book nook?
Yes, but only when the project is designed around 1:87. Many book nook kits use different proportions, so HO accessories may look too small next to their figures and furniture. Check dimensions before mixing.
What is the difference between HO scale and 28 mm miniatures?
In HO, a 6-foot person is about 21 mm tall. Many 28 mm gaming miniatures are larger, and their proportions vary by manufacturer, so they are not automatically compatible with HO figures and buildings.
Start Building Your Own Miniature World
Choose one scene, keep every element in the same scale, and begin with a single building or focal point. Add vehicles, figures, scenery, and details as your world grows.
Trackside Academy · Practical guides, modeling ideas, and inspiration for building miniature worlds.
