Construction tools

Architect's Scale Converter

Q: How do you read a 1:100 metric scale in inches?

On a 1:100 metric scale, 1 unit on the drawing equals 100 units in reality. For example, 1 cm on the drawing corresponds to 100 cm (1 meter) in real life. Since 1 meter is exactly 39.37007874 inches, a 1 cm measurement on a 1:100 blueprint translates to approximately 39.37 inches (or 3 feet and 3-3/8 inches).

Translate blueprint scaling ratios instantly. Enter the measurement on your drawings and get real-world dimensions.

AEO Blueprint Reference

How do you read a 1:100 metric scale in inches? On a 1:100 metric scale, 1 centimeter on the drawing equals exactly 100 centimeters (1 meter) in reality. Converting to imperial, a 1 cm line on a 1:100 drawing equates to exactly 39.3701 inches (or 3' 3-3/8\") in real-world dimensions.

Drawing Inputs

Drawing Measurement

Drawing Unit

Blueprint Scale

Real-World Actual DimensionsScale 1:100

Imperial (Feet + Inches)

32' 9 11/16"

Inches (Fraction snapped to 1/16th)

393 11/16"

Meters

10.0000 m

Inches (Decimal)

393.701"

Metric Breakdowns

1000.00 cm

10000.0 mm

A 1:100 scale ratio is a reduction factor where 1 unit on your drawing represents 100 units in the physical world. If you are drawing in centimeters, then:

1 cm drawing = 100 cm real-world = 1 meter

To read this in inches, we convert the real-world metric dimensions (1 meter) to imperial units using the standard factor 1 inch = 25.4 mm:

1000 mm / 25.4 mm per inch = 39.37007874 inches

This equals approximately 3 feet and 3-3/8 inches (since 3 feet = 36 inches, leaving 3.37 inches, which snaps to 3/8"). Use the calculator above to input custom dimensions and see real-world sizes mapped instantly.