Square Inches to Square Centimeters

What is the in² to cm² Converter?

This tool converts square inches to square centimeters, essential for product specifications, crafting, and technical applications where precision matters.

Common Applications

Small area conversions between imperial and metric are needed in many contexts:

• Product specifications — comparing US and international product sizes
• Crafting and DIY — patterns from different countries use different units
• Screen comparisons — converting display areas for tech reviews
• Technical drawings — manufacturing specs may require metric

The Conversion

1 square inch = 6.4516 square centimeters

Since 1 inch = 2.54 cm, the square relationship is 2.54² = 6.4516. A 10 in² area (like a small tablet screen) equals 64.5 cm².

Scale Context

An 8.5" × 11" US letter paper has an area of 93.5 in² or 603 cm². An A4 sheet (international standard) is 624 cm², making it slightly larger.

How to Use

1. Calculate or find your square inch measurement
2. Enter the value — type in the left field
3. Get square centimeters — the metric equivalent appears

Reference Conversions

Common sizes in both measurements:

• 1 in² = 6.45 cm² — about the size of a postage stamp
• 10 in² = 64.5 cm² — smartphone screen area
• 50 in² = 322.6 cm² — tablet screen area
• 100 in² = 645.2 cm² — about A4 paper size
• 200 in² = 1290.3 cm² — laptop screen area

Crafting Application

When following a crafting pattern that lists materials in square inches, convert to centimeters before cutting metric-sized materials. This prevents costly mistakes!

Reverse Conversion

Click the swap button (↔) to convert square centimeters to square inches.

Converter Features

Instant Real-Time Conversion

See square centimeter equivalents as you type. Convert product dimensions and craft measurements instantly.

Bidirectional Conversion

Switch between in² and cm² with one click. Work in whichever unit your project requires.

One-Click Copy

Copy metric results for international orders, technical specifications, or pattern adaptations.

Product Size Reference

Common items in both measurements:

• 1 in² (6.45 cm²) - Postage stamp
• 10 in² (64.5 cm²) - Smartphone screen
• 50 in² (323 cm²) - Small tablet screen
• 100 in² (645 cm²) - Approximately A4 paper

Mobile-Optimized Design

Convert measurements on your phone when shopping, crafting, or comparing product specifications.

Frequently Asked Questions

What is the conversion factor for in² to cm²?

1 in² = 6.4516 cm². This comes from 2.54² since 1 inch = 2.54 centimeters exactly.

Why is the factor 6.45 and not 2.54?

Area conversion squares the linear conversion. If 1 inch = 2.54 cm, then 1 in² = 2.54 × 2.54 = 6.4516 cm².

How do I convert screen sizes?

Screen sizes (diagonal) don't directly convert to area. Calculate area from width × height, then convert. A 6" × 3" phone = 18 in² = 116 cm².

Is there a quick estimation method?

Multiply by 6.5 for easy mental math. For 10 in²: 10 × 6.5 = 65 cm². The exact answer is 64.5 cm²—close enough.

What about converting paper sizes?

US Letter (8.5" × 11") = 93.5 in² = 603 cm². A4 (21 × 29.7 cm) = 624 cm² = 96.7 in². A4 is slightly larger.

Does this work for irregular shapes?

Yes, once you calculate the area in square inches (however you measure it), the conversion to cm² is the same: multiply by 6.4516.