Convert Square Centimeter to Square Mil
Convert square centimeters to square mils instantly. 1 square centimeter = 155000.31000062 square mil — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Mil to Square Centimeter converter for the reverse conversion.
Units explained
Square Centimeter
A square centimeter is a metric unit of area equal to 10⁻⁴ m² (1 cm × 1 cm). It is widely used in everyday measurement, lab work, and small-area applications.
Derived by squaring the centimeter (1/100 of a meter). The centi- prefix comes from the Latin 'centum' (hundred).
Square centimeters express the cross-sectional area of pipes and cables, the surface area of small everyday objects, biological tissue samples, and many engineering quantities. The SI unit for medical/pharmaceutical dose-per-area is often expressed in cm².
Centimeter has been part of the metric system since 1795.
Square Mil
A square mil is an imperial unit of area equal to 6.4516×10⁻¹⁰ m². It is widely used in printed circuit board (PCB) design and electronics manufacturing.
Derived by squaring the mil (1 mil = 1/1000 of an inch = 0.0254 mm). Standardized via the 1959 International Yard and Pound Agreement.
Square mils are the standard unit for PCB trace cross-sections, pad areas, and component pitches in US-localized electronic design software and datasheets.
Standardized via the 1959 International Yard and Pound Agreement.
Square Centimeter to Square Mil conversion formula
The relationship between square centimeters and square mils:
To convert square centimeters to square mils, multiply the value in square centimeters by 155000.31000062. To reverse, multiply square mils by 6.4516e-6.
How to use this converter
Type a value into the calculator. The result in square mils updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Square Mil to Square Centimeter converter for the reverse direction.
Step-by-step: convert square centimeters to square mils
- Write down the value in square centimeters (cm²).
- Multiply that value by the factor 155000.31000062.
- The product is the equivalent value in square mils (mil²).
- To reverse, multiply the square mil value by 6.4516e-6.
Worked examples
Example 1 — Convert 1 cm² to mil²:
1 × 155000.31000062 = 155000.31000062 mil²
Example 2 — Convert 100 cm² to mil²:
100 × 155000.31000062 = 1.550003e+7 mil²
Real-world example — From microns to sub-micron features
One square centimeter equals one thousand square mils — the conversion semiconductor designers do constantly when comparing mask feature dimensions to actual transistor gate lengths.
1 cm² × 155000.31000062 = 155000.31000062 mil²
Real-world example — Infrared to visible-spectrum mapping
A 10-square centimeter thermal infrared wavelength corresponds to a much larger number in square mils, the unit favoured for ultraviolet and visible-light specifications.
10 cm² × 155000.31000062 = 1550003.1000062004 mil²
Real-world example — Mid-micron to nanometer
3 square centimeters equals 3,000 square mils — useful when relating mid-infrared wavelengths (typically quoted in microns) to nanometer-scale visible-light wavelength tables.
3 cm² × 155000.31000062 = 465000.9300018601 mil²
Square Centimeter to Square Mil conversion table
Standard reference values for converting square centimeters to square mils:
| Square Centimeter [cm²] | Square Mil [mil²] |
|---|---|
| 0.01 | 1550.0031000062 |
| 0.1 | 15500.031000062 |
| 1 | 155000.31000062 |
| 2 | 310000.6200012401 |
| 3 | 465000.9300018601 |
| 4 | 620001.2400024801 |
| 5 | 775001.5500031002 |
| 10 | 1550003.1000062004 |
| 20 | 3100006.2000124007 |
| 30 | 4650009.3000186011 |
| 40 | 6200012.4000248015 |
| 50 | 7750015.5000310009 |
| 100 | 1.550003e+7 |
| 500 | 7.750016e+7 |
| 1000 | 1.550003e+8 |
Frequently asked questions
How many square mils is 1 square centimeter?
How do I convert square centimeters to square mils?
How do I convert square mils back to square centimeters?
How many square mils is 100 square centimeters?
Popular area unit conversions
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Metric / SI (15 units)
Imperial / US Customary (15 units)
US Survey (5 units)
Indian Subcontinent (16 units)
Other Regional (10 units)
Scientific / Physics (5 units)
Sources & references
Conversion factor (1 cm² = 155000.31000062 mil²) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.