Conversion & Math📅 2026-09-10⏱️ 5 min readBy Online Ruler Standards Team

Inches to Centimeters (cm): Complete Conversion Chart & Fraction Formula

Convert inches to centimeters (cm) with our complete conversion chart. Features exact 1/16 to 12 inch conversions, mathematical formulas, and on-screen ruler guides.

To convert inches to centimeters (cm), multiply the inch value by exactly 2.54. Formula: cm = inches × 2.54. For example, 10 inches = 25.4 cm, and 12 inches (1 foot) = 30.48 cm. To convert cm to inches, divide by 2.54.

Inches to Centimeters (cm): Complete Conversion Chart & Fraction Formula
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Whether working on DIY projects, ordering international clothing, or reading blueprints, switching between imperial and metric systems is a daily requirement. Here is everything you need to convert inches to centimeters accurately.

The Exact Formula: 1 Inch = 2.54 cm

Length in cm = Length in inches × 2.54

Length in inches = Length in cm ÷ 2.54

Fractional Inches to Centimeters (1/16″ to 1″)

Fraction Decimal Millimeters (mm) Centimeters (cm)
1/16″0.0625″1.59 mm0.16 cm
1/8″0.1250″3.18 mm0.32 cm
1/4″0.2500″6.35 mm0.64 cm
3/8″0.3750″9.53 mm0.95 cm
1/2″0.5000″12.70 mm1.27 cm
5/8″0.6250″15.88 mm1.59 cm
3/4″0.7500″19.05 mm1.91 cm
7/8″0.8750″22.23 mm2.22 cm
1″1.0000″25.40 mm2.54 cm

Whole Inches to Centimeters Chart (1″ to 12″)

1 inch: 2.54 cm
2 inches: 5.08 cm
3 inches: 7.62 cm
4 inches: 10.16 cm
5 inches: 12.70 cm
6 inches: 15.24 cm
8 inches: 20.32 cm
10 inches: 25.40 cm
12 inches: 30.48 cm

Frequently Asked Questions

Why is 1 inch exactly 2.54 cm?▼

In 1959, the International Yard and Pound Agreement defined 1 yard as exactly 0.9144 meters, making 1 inch precisely 25.4 millimeters or 2.54 centimeters.

How many centimeters is a 12-inch ruler?▼

A standard 12-inch ruler is exactly 30.48 centimeters long.

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