Map and Model Scale Converter: 1:50,000 Maps, Drawings and Models

What is it?

The Map & Model Scale Converter turns a measured length on a map, plan or model into real-world size, or a real size into scale size.

Who is it for?

Students reading maps, architects and builders reading plans, trekkers using topographic maps, and model makers.

How to use it

1. Under I have, choose whether your length is on the map/model or in real life.
2. Type the Length and the Scale 1 : number (for example 50000).
3. Pick the unit under Show the answer in.

Reading a scale

• 1:50,000 means 1 cm on the map is 50,000 cm (500 m) on the ground. 4 cm on the map is 2 km.
• House plans are often 1:100 (1 cm = 1 m) or 1:50.
• Model trains: HO is 1:87, N is 1:160; model cars are often 1:18, 1:24 or 1:43.

Common problems

• A printed or photocopied plan may be resized, so the scale no longer matches. Measure a known dimension (like a door, 0.9 m) to check.
• Screen maps (Google Maps) change scale as you zoom; use their own distance tool instead.

Worked examples

• On a 1:50,000 trekking map, the trail measures 7.4 cm: 7.4 × 50,000 = 370,000 cm = 3.7 km.
• On a 1:100 house plan, a room is 4.2 cm × 3.5 cm: 4.2 m × 3.5 m.
• A 1:18 model car is 25 cm long: the real car is 25 × 18 = 4.5 m.

Common mistakes

• Forgetting to convert cm to m or km at the end.
• Using a printed map that was enlarged or reduced: check against the map’s scale bar.

Open the tool: Map & Model Scale Converter

Still stuck?

Contact support. Tell us which tool or page you were using, what you tapped, what you saw, and your phone or computer and browser (for example: Android phone, Chrome). We reply by email.