Convert Square Inches to Square Meters

Formula

m² = in² × 0.00064516

or m² = in² ÷ 1550.003100006

Derivation from SI units:

• 1 in² = (0.0254 m)² = 6.4516 × 10⁻⁴ m² = 6.4516 cm²
• 1 m² = 1 m × 1 m

Both units are defined exactly, so the factor is exact. Square Inch definition: square inch; Square Meter definition: square meter.

Worked examples

1. A reading of 4 in² converts to 0.00258064 m².
   4 in² × 0.00064516 = 0.00258064 m²
2. A value of 25 in² is 0.016129 m².
   25 in² × 0.00064516 = 0.016129 m²

Where it's used

Square Inches are used for pressure in psi (pounds per square inch), while square meters appear in floor and room areas. Both measure area, so the conversion is a fixed factor.

Square Inch to other area units

Frequently asked questions

Sources

• Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "square inch (in²)".
• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 2, coherent derived units.

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.