Scale Conversion Calculator
Convert real-life measurements to common model railroad and hobby scales, or convert one scale size to another.
Converted Measurement
Tip: Choose Real Life as the starting scale to convert prototype dimensions into HO, N, O, G, S, Z, and other common modeling scales.
Model Train Scale Conversion Calculator
Use the Scalecoat model train scale conversion calculator to quickly convert real-life measurements into accurate model dimensions. This tool is useful for HO scale, N scale, O scale, G scale, S scale, Z scale, military models, dioramas, structures, vehicles, and scratch-building projects.
Convert Real Life Measurements to Model Scale
Enter a real-world measurement, choose your starting scale, and convert it into another common modeling scale. The calculator helps modelers convert prototype dimensions into inches, feet, millimeters, centimeters, and meters for more accurate planning and building.
- Convert real-life dimensions to model scale
- Convert HO scale to N scale, O scale to HO scale, and more
- Use inches, feet, millimeters, centimeters, or meters
- Helpful for model railroads, scale models, dioramas, and custom builds
Popular Model Railroad Scale Ratios
- HO Scale: 1:87
- N Scale: 1:160
- O Scale: 1:48
- S Scale: 1:64
- G Scale: commonly 1:20.3, 1:22.5, 1:24, or 1:29
- Z Scale: 1:220
Common Scale Conversion Examples
- 40 ft real-life freight car in HO scale: about 5.5 inches
- 50 ft real-life freight car in HO scale: about 6.9 inches
- 85 ft real-life passenger car in N scale: about 6.4 inches
How Scale Conversion Works
A model scale is a ratio between the model and the real object. For example, HO scale at 1:87 means 1 inch on the model represents 87 inches in real life. This calculator converts your starting measurement to full-size dimensions first, then converts that measurement into the selected target scale.
Shop Scalecoat Paint & Finishing Products
Accurate scale dimensions help with layout planning, detailing, and finishing. Scalecoat paints are made for modelers who want smooth coverage, durable finishes, and accurate hobby colors.
Scale Conversion FAQ
What is a model scale calculator?
A model scale calculator converts real-life dimensions into smaller model sizes or converts one model scale into another.
How do you convert real life to HO scale?
To convert real life to HO scale, divide the real-life measurement by 87.
How do you convert real life to N scale?
To convert real life to N scale, divide the real-life measurement by 160.
Can I convert one model scale to another?
Yes. The calculator converts the original scale measurement back to real-life size first, then converts it into the new scale.