Square Centimeter to Square Inch Converter
Area · unit-converter
Convert Square Centimeter to Square Inch with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use square-meter-based definitions (international feet / yard standards, acre, hectare, and regional units like pyeong/tsubo).
Calculator
From: Square Centimeter (cm2)
To: Square Inch (in2)
About Square Centimeter
The square centimeter is one ten-thousandth of a square meter. Small objects, paper sizes, and biology use square centimeters.
About Square Inch
The square inch is the area of a square one inch on a side. Displays, machining, and small parts often reference square inches.
How to convert square centimeters to square inches
1 square centimeter is equal to 0.15500031000062 square inch:
1 cm2 = (0.0001 m² ÷ 0.00064516 m²) in2 = 0.15500031000062 in2
Each square centimeter is defined as 0.0001 m² and each square inch as 0.00064516 m², so one cm2 equals 0.0001 ÷ 0.00064516 in2 = 0.15500031000062 in2.
Let a(cm2) be the numeric value of the same area measured in Square Centimeter (cm2), and a(in2) the value in Square Inch (in2). Then:
a(in2) = a(cm2) × (0.0001 / 0.00064516)
Equivalently, divide by how many cm2 fit into one in2 (m² per in2 divided by m² per cm2):
a(in2) = a(cm2) ÷ 6.4516
Or: square inch = square centimeter ÷ 6.4516
Examples
Example #1: Convert 20 cm2 to square inch
20 cm2 = 20 cm2 × (0.0001/0.00064516) in2 = 3.1000062 in2
20 cm2 = 20 cm2 ÷ 6.4516 = 3.1000062 in2
Example #2: Convert 50 cm2 to square inch
50 cm2 = 50 cm2 × (0.0001/0.00064516) in2 = 7.7500155 in2
50 cm2 = 50 cm2 ÷ 6.4516 = 7.7500155 in2
Summary
To convert Square Centimeter to Square Inch, multiply the value in cm2 by the ratio of square meters per cm2 divided by square meters per in2. Equivalently: value_in2 = value_cm2 × (0.0001 / 0.00064516). Numerically, 1 cm2 equals 0.15500031000062 in2.
Relationship context
You are converting between metric (SI) (Square Centimeters) and US customary / imperial (Square Inches). Metric area is decimal from the square meter; US/imperial units use feet, yards, miles, and acres tied to international feet (0.3048 m) and related definitions. The numeric factor used here is 1.550003e-1.
Conversion tables
| Square Centimeter (cm2) | Square Inch (in2) |
|---|---|
| 0.1 | 0.015500031 |
| 1 | 0.15500031 |
| 2 | 0.31000062 |
| 3 | 0.46500093 |
| 4 | 0.62000124 |
| 5 | 0.77500155 |
| 6 | 0.93000186 |
| 7 | 1.08500217 |
| 8 | 1.24000248 |
| 9 | 1.39500279 |
| Square Centimeter (cm2) | Square Inch (in2) |
|---|---|
| 10 | 1.5500031 |
| 20 | 3.1000062 |
| 30 | 4.6500093 |
| 40 | 6.2000124 |
| 50 | 7.7500155 |
| 60 | 9.3000186 |
| 70 | 10.8500217 |
| 80 | 12.4000248 |
| 90 | 13.9500279001 |
| 100 | 15.5000310001 |