Square millimeter (mm²)
A square one millimeter on each side.
What is a square millimeter?
- Symbol
- mm²
- Quantity
- Area
- Unit system
- SI
- Definition
- A square one millimeter on each side.
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
Used for wire cross-sections (cable sizes) and small component areas.
Square millimeter in other area units
- 1 mm² = 0.01 cm²Square centimeter
- 1 mm² = 0.000001 m²Square meter
- 1 mm² = 1e-10 haHectare
- 1 mm² = 1e-12 km²Square kilometer
- 1 mm² ≈ 0.0015500031 in²Square inch
- 1 mm² ≈ 0.00001076391042 ft²Square foot
- 1 mm² ≈ 0.000001195990046 yd²Square yard
- 1 mm² ≈ 2.471053815e-10 acAcre
- 1 mm² ≈ 3.861021585e-13 mi²Square mile
Square millimeter quick reference
| Square millimeter | Square meter | Square foot | Square centimeter |
|---|---|---|---|
| 1 mm² | = 0.000001 m² | ≈ 0.00001076391042 ft² | = 0.01 cm² |
| 10 mm² | = 0.00001 m² | ≈ 0.0001076391042 ft² | = 0.1 cm² |
| 100 mm² | = 0.0001 m² | ≈ 0.001076391042 ft² | = 1 cm² |
| 1000 mm² | = 0.001 m² | ≈ 0.01076391042 ft² | = 10 cm² |
Where the square millimeter fits
The next larger area unit is the square centimeter (cm²). 1 mm² = 0.01 cm², and 1 cm² = 100 mm².
Frequently asked questions
- How many square meters are in one square millimeter?
- One square millimeter = 0.000001 m² (square meters).
- How many square feet are in one square millimeter?
- One square millimeter ≈ 0.00001076391042 ft² (square feet).
- How many square centimeters are in one square millimeter?
- One square millimeter = 0.01 cm² (square centimeters).