What does a 1:2 scale mean?

A 1:2 scale means the drawing is half the size of the real object. Every 1 mm on the drawing represents 2 mm in reality. Common architectural scales include 1:50, 1:100 and 1:200.

What scale should I use for my drawing?

Choose a scale that fits your subject onto your paper. For small objects, 1:1 (full size) or 2:1 (double size) works well. For room interiors, try 1:20 or 1:50. For buildings, 1:100 or 1:200 is common.

Can I scale up larger than life?

Yes, use a ratio less than 1. For example, 1:0.5 means the drawing is twice real size. This is useful for detailed studies of small objects like insects, jewellery or botanical illustrations.

ArtCalcs

Drawing Scale Calculator — Convert Measurements

Convert real-world measurements to drawing scale and vice versa.

Conversion Direction

Real-World Measurement

Scale Ratio (1:X)

Enter the X in 1:X

How We Calculate This

This calculator converts between real-world and drawing measurements using scale ratios.

Drawing size = Real size / Scale ratio
Real size = Drawing size x Scale ratio

For example, at 1:50 scale, a 3000 mm (3 m) wall becomes 60 mm on paper. All measurements maintain the same proportional relationships at any scale.

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify quantities before purchasing materials.